JP2017133282A - Steel device and load bearing wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel device capable of ensuring a stable energy absorption performance at a small manufacturing cost.SOLUTION: Disclosed steel device 1 is attached to an axial force member 2 on which a tensile load Pt or a compression load Pc acts. The steel device includes: an anchorage part 3 attached to a side face 25 of the axial force member 2; and a bent part 4 continuously formed from the anchorage part 3. The bent part 4 is formed protruding in an outward direction α from the side face 25 of the axial force member 2. When the tensile load Pt or compression load Pc is applied to the axial force member 2, the bent part telescopically deforms in an axial direction Z of the axial force member 2.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a steel device provided on an axial force member on which a tensile load or a compressive load acts, and a load bearing wall provided as a wall of a building.

  Conventionally, for example, Patent Documents 1 and 2 disclose that energy is effectively absorbed between structural members that cause relative displacement in opposite directions, and that functional degradation due to eccentricity between structural members is solved. Steel dampers have been proposed.

  The steel damper disclosed in Patent Document 1 is straddled between structural members that are separated from each other and cause relative displacement in opposing directions, and undergoes a bending yield by receiving an axial force at the time of relative displacement between the structural members. is there. The steel damper disclosed in Patent Document 1 includes a shaft portion connected to each structural member and facing a distance on the same axis, and a shaft that bypasses the axis between both shaft portions and spans both ends. And a bending material that is bonded to the portion and bears a bending moment.

  The vibration control device for a joint disclosed in Patent Document 2 includes a shaft assembly material that forms a joint of a shaft assembly, fixing portions on both sides that are respectively fixed to the other shaft assembly material, and fixing portions on the both sides. It is provided with a shape bent in the in-plane direction or out-of-plane direction of the shaft assembly in between and absorbs the displacement of the joint portion of the shaft assembly by deforming in the in-plane direction or out-of-plane direction of the shaft assembly It is formed from a deformation part.

JP-A-5-263549 JP 2002-235457 A

  Here, in particular, the steel damper disclosed in Patent Document 1 is straddled between structural members serving as axial force members, and connects both shaft portions of the steel damper to end surfaces facing each other of the respective structural members. Is provided. At this time, in the steel damper disclosed in Patent Document 1, since the shaft portion for connecting to the structural member and the bending material bearing the bending moment are configured as separate members, the manufacturing cost of each member and the shaft The processing cost for joining a part and a bending material increases.

  In addition, the steel damper disclosed in Patent Document 1 is such that a U-shaped bending material is formed by bypassing the axis between both shaft portions, and the U-shaped bending material is easily deformed in the axial direction. Thus, sufficient axial rigidity cannot be ensured. Furthermore, in the steel damper disclosed in Patent Document 1, the U-shaped bending material is easily deformed in the axial orthogonal direction, and it is necessary to suppress the deformation in the axial orthogonal direction using a thick steel plate as the bending material. Therefore, the material cost of a bending material increases because the amount of steel materials required for manufacture of a bending material increases.

  And the damping device of the junction part indicated by patent documents 2 is provided in the junction part of the axis set which joined the column and the beam mutually, especially the brace material etc. which tensile load or compression load acts on It is not provided in the axial force member. Moreover, although the vibration damping device of the junction part disclosed by patent document 2 exhibits energy absorption performance because a deformation | transformation part deform | transforms, since the fixing | fixed part fixed to a shaft assembly is not stiffened, energy Absorption performance may be unstable.

  Therefore, the present invention has been devised in view of the above-described problems, and its object is to make steel that can be manufactured at a low manufacturing cost while ensuring stable energy absorption performance. It is to provide a device and a load bearing wall.

  A steel device according to a first aspect of the present invention is a steel device provided on an axial force member to which a tensile load or a compressive load acts, and a fixing portion attached to a side surface of the axial force member, and continuously from the fixing portion. A bent portion provided, and the bent portion is formed so as to protrude outward from the side surface of the axial force member, and when a tensile load or a compressive load acts on the axial force member, It is characterized in that it expands and contracts in the axial direction.

  A steel device according to a second invention further comprises a stiffener attached to the fixing portion in the first invention, wherein the stiffener sandwiches the fixing portion between a side surface of an axial force member. Is provided.

  A steel device according to a third invention is the steel device according to the first invention or the second invention, wherein the fixing portion is provided as a pair on both sides in the axial direction of the bent portion, and a pair of side surfaces of the axial force member is provided. Each of the fixing portions is attached by bolt joining.

  A steel device according to a fourth invention is the steel device according to any one of the first to third inventions, wherein the fixing portion is provided as a pair on both sides in the axial direction of the bent portion, and the bent portion is The folds bent in the out-of-plane direction are formed at three places, two places continuous from each of the pair of fixing sections and one place between the pair of fixing sections.

  The steel device according to a fifth aspect of the present invention is the steel device according to the fourth aspect, wherein the bent portion is the two folds that are continuous from each of the pair of fixing portions, and is 15 ° with respect to the axial orthogonal direction of the axial force member. As described above, it is formed to be inclined at an inclination angle of 43 ° or less.

  A steel device according to a sixth invention is the steel device according to any one of the first invention to the third invention, wherein the fixing portion is provided as a pair on both sides in the axial direction of the bent portion, and the bent portion is The folds that are bent in the out-of-plane direction are formed at four locations at two locations that are continuous from each of the pair of fixing portions and at two locations that are intermediate between the pair of fixing portions.

  The steel device according to a seventh aspect of the present invention is the steel device according to any one of the first to sixth aspects, wherein the bent portion is formed with a fold that is bent and bent in an out-of-plane direction, and the inner side of the fold. The curvature radius is set to be equal to or larger than the plate thickness of the bent portion.

  A bearing wall according to an eighth aspect of the present invention is a bearing wall provided as a wall of a building, which is an axial force member serving as a brace material on which a tensile load or a compressive load acts, and a part of the axial force member in the axial direction. The steel device has a fixing part attached to a side surface of the axial force member, and a bent part provided continuously from the fixing part, and the bent part. However, it is formed so as to protrude from the side surface of the axial force member in the out-of-plane direction, and when a tensile load or a compressive load acts on the axial force member, the axial force member expands and contracts in the axial direction. It is characterized by.

  A bearing wall according to a ninth aspect of the present invention is the load bearing wall according to the eighth aspect, wherein the axial force member is arranged such that a pair of end portions separated in the axial direction are spaced apart from each other and from the one end portion to the other end portion. A core material that is continuously inserted is provided.

  According to 1st invention-9th invention, when a tensile load and a compressive load act on an axial force member alternately due to repeated external forces, such as an earthquake or a wind, it is a bending part in the axial direction of an axial force member. By expanding and contracting, it is possible to ensure stable energy absorption performance against repeated external forces such as earthquakes and winds.

  According to 1st invention-9th invention, since the remarkable proof stress deterioration by buckling, a fracture | rupture, etc. of a steel device can be suppressed, an axial force member is reduced by reducing the burden to the axial force member to which a fixing part is attached. It becomes possible to prevent damage.

  According to 1st invention-9th invention, without using a viscoelastic damper with high temperature dependency, the steel plate etc. in which the bending part was formed by the easy bending process to an out-of-plane direction are used. It becomes possible to manufacture a steel device at a low manufacturing cost.

  In particular, according to the second invention, the bending portion is expanded and contracted in the axial direction to exhibit stable energy absorption performance, and at the same time, the stiffening is performed with the fixing portion sandwiched between the side surfaces of the axial force member. By providing the material, it is possible to suppress the out-of-plane deformation of the fixing portion with the stiffening material and to ensure sufficient proof stress and rigidity.

  In particular, according to the third aspect of the present invention, each of the pair of fixing portions is attached to the side surface of the axial force member by bolt joining so that the old steel device whose bent portion is damaged by plastic deformation or the like can be easily removed. Therefore, it is possible to easily replace the steel device with a new one.

  In particular, according to the fourth invention and the sixth invention, the substantially triangular shape, the substantially rectangular shape, the substantially trapezoidal shape or the substantially inverted trapezoidal bent portion is formed by an easy bending process such as a steel plate, It becomes possible to reduce the workability of the steel device.

  In particular, according to the fifth aspect, by making the inclination angle of the bent portion 15 ° or more and 43 ° or less with respect to the direction perpendicular to the axis, the steel device can be easily manufactured and at the same time against the tensile load. Suppresses an increase in the yield strength of the steel device, and can secure a predetermined deformation performance of the steel device against a compressive load, so that a stable energy absorption performance can be exhibited.

  In particular, according to the seventh invention, by sufficiently increasing the radius of curvature of the fold, the plasticizing region when the fold is deformed is enlarged, and the fold is deformed when the fold is bent. Therefore, it is possible to reduce the accumulated strain in combination with the time when it is made to suppress the increase in yield strength due to work hardening and to enhance the resistance characteristics against low cycle fatigue.

  In particular, according to the eighth aspect of the invention, since the steel device is provided on the brace material serving as the axial force member, stable energy is applied to the brace material in the space in the frame even though the tensile load and the compressive load act alternately. It is possible to provide a wall of a building with improved absorption performance and improved seismic performance.

  In particular, according to the ninth aspect, by providing a core material that is continuous from one end of the axial force member to the other end, the eccentric deformation of the steel device in the width direction or the depth direction is suppressed. Thus, it is possible to stop the deviation between the steel devices and suppress the overall buckling of the steel devices.

It is a perspective view which shows the bearing wall in which the steel device to which this invention is applied is introduced. (A) is a front view which shows the state before a horizontal force acts on the bearing wall to which this invention is applied, (b) is the AA sectional view, (c) is the horizontal. It is a front view which shows the state after force acts. (A) is a top view which shows the axial force member of the closed cross-sectional shape where the steel device to which this invention is applied is provided, (b) is a top view which shows the axial force member of the open cross-sectional shape. (A) is a front view which shows the axial force member of the flat steel in which the steel device to which this invention is applied is provided, (b) is the axial force member of the steel pipe processed by crushing the edge part substantially flatly. It is a front view which shows, (c) is a front view which shows the axial force member of a metal joint. (A) is a front view which shows the axial force member provided with the steel device to which this invention is applied, (b) is the side view. (A) is a front view which shows the bending part which protruded to the outer side of the out-of-plane direction with the steel device to which this invention is applied, (b) is the bending part protruded to the inner side of the out-of-plane direction. FIG. It is a front view which shows the bending part which curved and protruded in the out-of-plane direction with the steel devices to which this invention is applied. (A) is a front view which shows the substantially rectangular bending part with the steel devices to which this invention is applied, (b) is a front view which shows the substantially trapezoidal bending part, (c ) Is a front view showing the substantially inverted trapezoidal bent portion. (A) is a front view which shows the bending part extended | stretched by the tensile load with the steel device to which this invention is applied, (b) is a front view which shows the bending part contracted by the compression load. . It is a top view which shows the axial force member with which the steel device to which this invention was applied was provided in the side surface of 4 surfaces. It is a front view showing the state where a plurality of steel devices to which the present invention is applied are superimposed on each other. (A) is a front view which shows the reduced diameter part formed in the edge part of the axial force member with which the steel device to which this invention is applied is provided, (b) is formed in the edge part of the axial force member It is a front view which shows the made diameter-expanded part. It is a front view which shows the core material inserted by the edge part of the axial force member with which the steel device to which this invention is applied is provided. It is a graph which shows the expansion-contraction deformation amount of the bending part at the time of tensile load loading and compression load loading by the FEM analysis result of the steel devices to which this invention is applied. It is a graph which shows that a yield strength and rigidity improve by providing a stiffener by the FEM analysis result of the steel device to which this invention is applied. It is a graph which shows the relationship between the inclination | tilt angle of a bending part, and a yield increase rate by the FEM analysis result of the steel device to which this invention is applied. (A) is a front view which shows the axial force member of the steel frame material with which the steel device to which this invention is applied is provided, (b) is a front view which shows the axial force member of the wooden material.

  Hereinafter, the form for implementing the steel device 1 and the bearing wall 7 to which this invention is applied is demonstrated in detail, referring drawings.

  As shown in FIG. 1, a steel device 1 to which the present invention is applied is provided on an axial force member 2 of a building such as a house, a school, an office, or a hospital facility. The steel device 1 to which the present invention is applied may be provided on an axial force member 2 of a building such as a plant structure or a steel tower.

  The steel device 1 to which the present invention is applied is particularly provided in the axial force member 2 on which a tensile load Pt or a compressive load Pc acts. A steel device 1 to which the present invention is applied is provided on an axial force member 2 such as a column member, a beam member, or a brace member 20 and is introduced into a bearing wall 7 or the like of a building.

  The load bearing wall 7 to which the present invention is applied is provided as a wall of a building such as a steel house, a steel frame prefab, or a wooden house. The bearing wall 7 to which the present invention is applied is, for example, surrounded by a pair of vertical frames 71 and a pair of horizontal frames 72 to form a predetermined frame space 70.

  The bearing wall 7 to which the present invention is applied includes an axial force member 2 to be a brace material 20 and a steel device 1 provided on a part of the axial force member 2. As shown in FIG. 2, the bearing wall 7 to which the present invention is applied has, for example, a height dimension H of about 3000 mm and a width dimension W of about 1000 mm.

  As shown in FIG. 2A, the bearing wall 7 to which the present invention is applied is provided, for example, with the axial force member 2 serving as the brace material 20 inclined at each of the upper portion 70 a and the lower portion 70 b of the in-frame space 70. It is done. At this time, the brace material 20 is inclined toward the upper right corner or the upper left corner in the upper portion 70a of the inner space 70, and the brace material is directed toward the lower right corner or the lower left corner in the lower portion 70b of the inner space 70. 20 is provided with an inclination.

  As shown in FIG. 2 (c), the bearing wall 7 to which the present invention is applied is displaced so that each vertical frame 71 tilts in the horizontal direction when a horizontal force F acts due to an earthquake or wind. It becomes. At this time, the load-bearing wall 7 to which the present invention is applied has, for example, a tensile load Pt acting on the brace material 20 in the upper portion 70a of the inner space 70 and a compressive load Pc on the brace material 20 in the lower portion 70b of the inner space 70. Will act.

  Here, the load bearing wall 7 to which the present invention is applied, for example, when the horizontal force F is 20 kN and the interlayer deformation angle is 1/50, each brace material 20 has a yield strength of 36 kN or more and each brace material 20. It is necessary to secure a deformation performance of 17 mm or more. For this reason, the load bearing wall 7 to which the present invention is applied has an axial direction of the axial force member 2 to be the brace material 20 as shown in FIG. 3 in order to ensure a predetermined yield strength and deformation performance in each brace material 20. A steel device 1 is provided in a part of Z.

  As shown in FIG. 3A, the axial force member 2 is a square steel pipe formed in a closed cross-sectional shape having a substantially rectangular cross section. In addition, the axial force member 2 may be a square steel pipe formed in a closed cross-sectional shape having a substantially polygonal cross section such as a substantially hexagonal shape or a substantially octagonal shape, as shown in FIG. A channel steel formed into a C-shaped open cross-sectional shape or a channel steel with a lip may be used.

  The axial force member 2 has, for example, a square steel pipe thickness t2 of about 1.0 mm to 5.0 mm, an outer diameter D1 in the width direction X of about 30 mm to 90 mm, and an outer diameter D2 of the depth direction Y of about 60 mm to 180 mm. And The axial force member 2 has a side surface 25a in the width direction X disposed on one side or both sides in the width direction X, and a side surface 25b in the depth direction Y disposed on one side or both sides in the depth direction Y. A hollow portion 26 is formed by being surrounded by the side surface 25b in the depth direction Y.

  The axial force member 2 is formed such that the side surface 25a in the width direction X extends in the depth direction Y, and the side surface 25b in the depth direction Y extends in the width direction X. In the axial force member 2, a direction substantially orthogonal to each of the side surface 25 a in the width direction X and the side surface 25 b in the depth direction Y is an out-of-plane direction α of the side surface 25 of the axial force member 2. And as for the side surface 25 of the axial force member 2, while the hollow part 26 side of the axial force member 2 becomes the inner side A of the out-of-plane direction α, the outer side of the axial force member 2 becomes the outer side B of the out-of-plane direction α.

  As shown in FIG. 4A, the axial force member 2 may be a flat steel 60 or the like, or as shown in FIG. A processed steel pipe may be used. Further, as shown in FIG. 4C, the axial force member 2 may be a metal fitting 6 or the like that is attached to a frame member and acts on an axial force as necessary.

  The steel device 1 to which the present invention is applied includes a fixing portion 3 attached to the side surface 25 of the axial force member 2 and a bent portion 4 provided continuously from the fixing portion 3, as shown in FIG. It is provided in a part of the axial direction Z of the axial force member 2. And the steel device 1 to which this invention is applied will further be provided with the stiffener 5 attached to the fixing | fixed part 3 as needed.

  As shown in FIG. 5A, the steel device 1 to which the present invention is applied is constructed on a pair of end portions 27 in which the axial force member 2 is divided in the axial direction Z and the axial force member 2 is divided. The In the steel device 1 to which the present invention is applied, a pair of end portions 27 that divide the axial force member 2 are arranged to face each other in the axial direction Z, and from one end portion 27 of the axial force member 2 to the other. It is provided continuously up to the end 27.

  In the steel device 1 to which the present invention is applied, the fixing unit 3 is attached to each side surface 25 of the axial force member 2 at each end portion 27 opposed to each other in the axial direction Z of the axial force member 2. Further, in the steel device 1 to which the present invention is applied, the pair of end portions 27 that divide the axial force member 2 are spaced apart from each other in the axial direction Z, and are continuous from the fixing unit 3 in the axial direction Z. A bent portion 4 is arranged.

  The fixing unit 3 is provided as a pair on both sides in the axial direction Z of the bent unit 4, and one fixing unit 3 is attached to one end 27 of the axial force member 2, and the axial force member 2 The other fixing unit 3 is attached to the other end 27. The fixing unit 3 is provided with a bolt nut 31 that is continuously penetrated to the side surface 25 of the axial force member 2 in a state of being in contact with the side surface 25 of the axial force member 2. Each of the pair of fixing portions 3 is attached by bolt joining.

  As shown in FIG. 5B, the fixing unit 3 is a pair of fixing units on the side surface 25 in the width direction X of the axial force member 2 with, for example, bolt nuts 31 provided in two rows in the depth direction Y. Each of 3 is attached by bolt joint. The fixing unit 3 may be attached to the side surface 25 of the axial force member 2 by bolt joining, or by screw joining, nail joining, pin joining, welding joining, or the like. The fixing unit 3 is attached with a stiffener 5 together with each fixing unit 3 by bolting or the like as necessary.

  As shown in FIG. 3 (a), the bolt nut 31 is either the axial force member 2 formed in a closed cross-sectional shape or the axial force member 2 formed in an open cross-sectional shape. Bolts may be provided continuously from one side surface 25 to the other side surface 25. And when a bolt is provided continuously, it is desirable to provide a spacer between one side surface 25 and the other side surface 25 so that tension can be introduced into the bolt. Moreover, the bolt nut 31 may be provided in each side surface 25 of the axial force member 2, as shown in FIG.3 (b).

  As shown in FIG. 5, the bent portion 4 is formed to protrude in the out-of-plane direction α from the side surface 25 of the axial force member 2. The bent portion 4 has, for example, a vertical dimension b in the axial direction Z of about 10 mm to 50 mm, a protrusion height h in the out-of-plane direction α of about 10 mm to 50 mm, and a horizontal dimension w in the width direction X or depth direction Y of 30 mm to 180 mm. The thickness t1 is set to about 1.0 mm to 5.0 mm.

  As shown in FIG. 6, the folding portion 4 is formed by bending in the out-of-plane direction α at a plurality of three or more locations between the pair of fixing portions 3. At this time, as shown in FIG. 6A, the bent portion 4 may be formed to protrude from the side surface 25 of the axial force member 2 toward the outer side B in the out-of-plane direction α. As shown in b), the axial force member 2 may be formed so as to protrude from the side surface 25 toward the inner side A in the out-of-plane direction α.

  The bent part 4 is bent or bent at the crease 40. When the bent portion 4 is bent at the fold 40 and bent, for example, the radius of curvature r1 on the inner peripheral side of the bent fold 40 is set to be equal to or larger than the plate thickness t1 of the bent portion 4 and bent. The radius of curvature r2 on the outer peripheral side of the crease 40 is set to be twice or more the plate thickness t1 of the bent portion 4.

  In the bent portion 4, folds 40 that are bent in the out-of-plane direction α are mainly formed at three positions between the pair of fixing portions 3. At this time, the bent portion 4 has two locations that are continuous in the axial direction Z from each of the pair of fixing portions 3 and one location that is intermediate between the pair of fixing portions 3 in the axial direction Z in the out-of-plane direction α. Bent folds 40 are formed at three locations.

  The bent portion 4 is formed in a substantially triangular shape by projecting in the out-of-plane direction α from the side surface 25 of the axial force member 2 particularly when the folds 40 bent in the out-of-plane direction α are formed at three locations. . At this time, the bent portion 4 has two fold lines 40 that are continuous from each of the pair of fixing portions 3, and the substantially triangular inclined surface 4 a is inclined from the axis orthogonal direction orthogonal to the side surface 25 of the axial force member 2. Thereby, it forms with inclination-angle (theta) of 15 degrees or more and 43 degrees or less with respect to the axial orthogonal direction of the axial force member 2.

  The bent portion 4 may be formed to be curved in the out-of-plane direction α, as shown in FIG. At this time, the fold portion 4 is formed with two folds 40 that are bent in the out-of-plane direction α, and bends between the folds 40 and the folds 40 in a substantially arc shape, a substantially elliptic arc shape, or the like. Formed.

  As shown in FIG. 8, the folding portion 4 may be formed with four folds 40 that are bent in the out-of-plane direction α at four locations between the pair of fixing portions 3 as necessary. At this time, the bent portion 4 has two locations that are continuous in the axial direction Z from each of the pair of fixing portions 3 and two locations that are intermediate between the pair of fixing portions 3 in the axial direction Z in the out-of-plane direction α. Bent folds 40 are formed at four locations.

  The bent portion 4 may be formed in a substantially rectangular shape shown in FIG. 8A, particularly when the folds 40 bent in the out-of-plane direction α are formed at four locations. It may be formed in a substantially trapezoidal shape shown in b) or a substantially inverted trapezoidal shape shown in FIG. At this time, the bent portion 4 has an inclined surface 4a having a substantially trapezoidal shape, for example, inclined at an inclination angle θ of 15 ° or more and 43 ° or less with respect to the direction orthogonal to the axis of the axial force member 2. It may be formed.

  As shown in FIG. 9, the bent portion 4 is formed to protrude in the out-of-plane direction α from the side surface 25 of the axial force member 2, and the tensile load Pt or the compressive load Pc in the axial direction Z acts on the axial force member 2. When this happens, the axial force member 2 expands and contracts in the axial direction Z.

  Here, as shown in FIG. 9A, the fixing unit 3 has a pair of fixing portions together with a pair of end portions 27 that divide the axial force member 2 when a tensile load Pt is applied to the axial force member 2. The parts 3 are displaced in the direction away from each other in the axial direction Z. At this time, the bent portion 4 is deformed to extend in the axial direction Z because the inclination angle θt at the fold line 40 with respect to the direction perpendicular to the axis becomes large.

  Further, as shown in FIG. 9B, the fixing unit 3 includes a pair of fixing units together with a pair of end portions 27 that divide the axial force member 2 when a compressive load Pc is applied to the axial force member 2. 3 are displaced in the axial direction Z so as to approach each other. At this time, the bending portion 4 is deformed so that the inclination angle θc at the fold line 40 with respect to the direction perpendicular to the axis is reduced and contracted in the axial direction Z.

  The stiffener 5 is made of flat steel or the like having a predetermined plate thickness t5 attached to the side surface 25 of the axial force member 2 by bolting together with the fixing portions 3. The stiffener 5 is provided in a state in which the fixing unit 3 is sandwiched between the axial force member 2 and the side surface 25 and is in contact with each fixing unit 3. The stiffener 5 is attached to each of the pair of fixing portions 3 by bolt joining by providing the bolt nuts 31 that are continuously penetrated to the fixing portion 3 and the side surface 25 of the axial force member 2.

  For example, the stiffener 5 is bent at each fixing unit 3 with a plate thickness t5 of flat steel or the like being 1.5 to 5 times larger than the plate thickness t1 of the fixing unit 3 and the bending unit 4. Provided near the portion 4. The stiffener 5 is in a state in which the fixing portion 3 is sandwiched between the side surface 25 of the axial force member 2 and the side surface of the axial force member 2 when the bent portion 4 expands and contracts in the axial direction Z. The fixing unit 3 is restrained by a flat steel having a predetermined thickness t5 so that the fixing unit 3 is not separated from the fixing unit 3 in the out-of-plane direction α.

  The stiffener 5 is a portion that is separated from the fixing portion 3 and is in the vicinity of the bent portion 4 as necessary, and a chamfer 5a is formed by partially cutting a corner portion of flat steel or the like. . The stiffener 5 has a chamfer 5a formed in the vicinity of the bent portion 4 so that when the bent portion 4 is deformed to contract in the axial direction Z, the corner portion of a flat steel or the like is formed. It can suppress that the bending part 4 interferes.

  The steel device 1 to which the present invention is applied is provided on each of the two side surfaces 25 of the axial force member 2 as shown in FIG. At this time, in particular, the steel device 1 to which the present invention is applied is provided on each of the two side surfaces 25 facing the width direction X or the depth direction Y of the axial force member 2 so that two steel devices are provided. It is desirable to arrange 1 so as to be bilaterally symmetric or longitudinally symmetric.

  Moreover, the steel device 1 to which the present invention is applied is provided on each of the four side surfaces 25 facing the width direction X and the depth direction Y of the axial force member 2 as shown in FIG. You may arrange | position so that the steel devices 1 may become left-right symmetric and front-back symmetric. The steel device 1 to which the present invention is applied is arranged in a symmetrical manner in either one or both of the width direction X and the depth direction Y of the axial force member 2, so that the bending portion 4 is expanded and contracted in the axial direction. Eccentricity with respect to Z can be suppressed.

  Furthermore, in the steel device 1 to which the present invention is applied, a plurality of steel devices 1 may be provided on each side surface 25 of the axial force member 2 as shown in FIG. At this time, as shown in FIG. 11A, the plurality of steel devices 1 stacked on each other may project the respective bent portions 4 together to the outer side B or the inner side A. Moreover, as shown in FIG.11 (b), as for the several steel device 1 piled up mutually, the bending part 4 which protruded to the inner side A was prevented so that bending parts 4 which protruded to the inner side A might not interfere. And the bent portion 4 protruding outward B may be combined.

  In addition, although the steel device 1 to which the present invention is applied is desirably arranged so that the even number of steel devices 1 are used and left-right symmetric or longitudinally symmetric, the odd number of steel devices 1 are used. And may be arranged so as not to be left-right symmetric or front-back symmetric. The steel device 1 to which the present invention is applied is arranged so as not to be left-right symmetric or back-and-forth symmetric, so that the steel device 1 can be provided mainly on the required side surface 25 of the axial force member 2.

  In the steel device 1 to which the present invention is applied, as shown in FIG. 5, the pair of end portions 27 obtained by dividing the axial force member 2 are separated from each other in the axial direction Z to form a separation portion S. The steel device 1 to which the present invention is applied is not limited to this, and as shown in FIG. 12, a reduced diameter portion 27 a or an enlarged diameter is provided at any end portion 27 obtained by dividing the axial force member 2 in the axial direction Z. By forming the portion 27 b, the pair of end portions 27 of the axial force member 2 may not be separated from each other in the axial direction Z.

  As shown in FIG. 12A, the steel device 1 to which the present invention is applied has a reduced diameter portion 27 a formed at one end portion 27 of the axial force member 2, and the other end portion of the axial force member 2. The axial force member 2 expands and contracts in the axial direction Z while being inserted into the shaft 27. In addition, as shown in FIG. 12B, the steel device 1 to which the present invention is applied has a diameter-enlarged portion 27 b formed on one end portion 27 of the axial force member 2 on the other end of the axial force member 2. The axial force member 2 expands and contracts in the axial direction Z in a state where the end portion 27 is inserted.

  In addition, as shown in FIG. 13, the steel device 1 to which the present invention is applied has a pair of end portions 27 obtained by dividing the axial force member 2 in the axial direction Z so as to be spaced apart from each other. A core material 29 inserted continuously from 27 to the other end 27 may be provided. At this time, as shown in FIGS. 12 and 13, the steel device 1 to which the present invention is applied has a pair of end portions 27 of the axial force member 2 connected by a reduced diameter portion 27 a or the like, or an axial force member. By providing the core material 29 that is continuous from one end 27 to the other end 27, the eccentric deformation in the width direction X or the depth direction Y is suppressed, and the overall buckling of the steel device 1 is performed. Can be suppressed.

  The steel device 1 to which the present invention is applied, as shown in FIG. 9, when the tensile load Pt and the compressive load Pc act alternately on the axial force member 2 due to repeated external forces such as earthquake or wind. The bent portion 4 expands and contracts in an elastic region and a plastic region. The steel device 1 to which the present invention is applied ensures stable energy absorption performance against repeated external forces such as earthquakes or winds by the bending portion 4 expanding and contracting in the axial direction Z of the axial force member 2. It becomes possible.

  Here, in order to verify the stable energy absorption performance of the steel device 1 to which the present invention is applied, the plate thickness t1 shown in FIG. 5 is 4.5 mm, the vertical dimension b of the bent portion 4 is 30 mm, and the protrusion height h. Was 26 mm and the lateral dimension w was 80 mm, and FEM analysis of the shell element model was performed. In this FEM analysis, as shown in FIG. 14, the design yield strength Pp of the steel device 1 is expressed by the following equation (1) in relation to the plate thickness t1, the protrusion height h, the lateral dimension w, and the yield stress σy. By calculating from the above, the results of the FEM analysis and the design strength Pp are compared.

  In FIG. 14, the FEM is in a range in which the amount of expansion and contraction in the axial direction Z of the bent portion 4 is 0 mm to ± 15 mm with reference to the state before the tensile load Pt or the compressive load Pc is applied to the axial force member 2. The results of the analysis are illustrated. Here, the tensile load Pt (positive direction on the vertical axis) and the compressive load Pc (negative direction on the vertical axis), the amount of expansion / contraction deformation with respect to the tensile load Pt of the bent portion 4 (positive direction on the horizontal axis), and the compressive load Pc. The relationship of the amount of expansion / contraction deformation (the negative direction of the horizontal axis) is illustrated.

  According to the result of the FEM analysis, the steel device 1 to which the present invention is applied is an initial stage in which the amount of expansion and contraction deformation increases regardless of whether the tensile load Pt or the compression load Pc is applied to the axial force member 2. Thus, it can be seen that a tensile strength or compression strength greater than the design strength Pp can be secured. And after the tensile load Pt or the compressive load Pc exceeds the design yield strength Pp, the steel device 1 to which the present invention is applied has a remarkable yield strength increase or buckling regardless of an increase in the amount of expansion / contraction deformation of the bent portion 4. It can be seen that there is no decrease in yield strength due to, and the tensile strength or compression strength only increases gradually.

  Therefore, the steel device 1 to which the present invention is applied can suppress an increase in the tensile strength or the compression strength more than necessary while ensuring the predetermined tensile strength, compression strength and deformation performance required for the axial force member 2. Recognize. Further, the steel device 1 to which the present invention is applied has a similar tendency of increasing the tensile load Pt and the compressive load Pc in the positive direction and the negative direction of the horizontal axis, and therefore, when the tensile load Pt is loaded and when the compressive load Pc is loaded. It can be seen that the difference in behavior of expansion and contraction is small. From the results of the FEM analysis, the steel device 1 to which the present invention is applied is also capable of exhibiting stable energy absorption performance by the bending portion 4 expanding and contracting in the axial direction Z of the axial force member 2. Verified.

  The steel device 1 to which the present invention is applied is particularly preferably provided with the stiffener 5 shown in FIG. 9 sandwiching the fixing portion 3 between the side surface 25 of the axial force member 2. Here, in order to verify the effect of the stiffener 5 of the steel device 1 to which the present invention is applied, the plate thickness t1 shown in FIG. 5 is 4.5 mm, the vertical dimension b of the bent portion 4 is 30 mm, and the protruding height. FEM analysis of the shell element model was performed with h being 26 mm and the lateral dimension w being 80 mm.

  In this FEM analysis, the fixing unit 3 is in the out-of-plane direction α at the position of the crease 40 that becomes the boundary with the bent portion 4 with the fixing unit 3 sandwiched between the side surface 25 of the axial force member 2 and the stiffener 5. Pretending to be bound by In this FEM analysis, as shown in FIG. 15, the fixing portion 3 restrained in the out-of-plane direction α is shown as “with stiffener” (solid line), and the fixing portion 3 is in the out-of-plane direction α. What is not restrained is shown as “no stiffener” (broken line), and both are compared.

  According to the result of this FEM analysis, the steel device 1 to which the present invention is applied has an initial rigidity of the steel device 1 of 40 regardless of whether the tensile load Pt or the compressive load Pc is applied to the axial force member 2. It can be seen that it rises by about%. Further, it can be seen that the steel device 1 to which the present invention is applied has an increase in tensile strength or compression strength of about 20% when the amount of expansion / contraction deformation of the bent portion 4 becomes ± 5 mm. Thereby, the steel device 1 to which the present invention is applied causes the bent portion 4 to expand and contract in the axial direction Z to exhibit stable energy absorption performance, and at the same time, the out-of-plane deformation of the fixing portion 3 is a stiffener. By suppressing at 5, it becomes possible to ensure sufficient proof stress and rigidity.

  The steel device 1 to which the present invention is applied has an inclination of 15 ° or more and 43 ° or less with respect to the direction perpendicular to the axis, as shown in FIG. 6, particularly in a state before the tensile load Pt or the compressive load Pc is applied. A bent portion 4 is formed at an angle θ. At this time, the steel device 1 to which the present invention is applied has a thickness t1 shown in FIG. 5 of 4.5 mm, the vertical dimension b of the bent portion 4 is 30 mm, the protruding height h is 26 mm, and the horizontal dimension w is 80 mm. The result of FEM analysis of the shell element model is shown in FIG. In FIG. 16, as shown in the analysis model list in Table 1, the results of analysis using various shapes as parameters are shown.

  In FIG. 16, a value obtained by dividing the tensile load Pt when the expansion / contraction deformation amount of the bent portion 4 becomes ± 5 mm by the compressive load Pc is shown on the vertical axis as a yield rate increase rate (Pt / Pc), and the bent portion An inclination angle θ of 4 is shown on the horizontal axis. Here, when the inclination angle θ of the bent portion 4 exceeds 43 °, as shown in FIG. 16, the rate of increase in yield strength increases abruptly. Therefore, when the tensile load Pt is loaded and when the compression load Pc is loaded, Thus, the difference in behavior of expansion and contraction becomes remarkably large. In addition, when the inclination angle θ of the bent portion 4 is less than 15 °, the inclination angle θ is too small, so that it is difficult to manufacture the steel device 1.

  For this reason, in the steel device 1 to which the present invention is applied, the yield angle increase rate is maintained in the range of about 1.2 or less by the inclination angle θ of the bent portion 4 being 43 ° or less, and the tensile load Pt It is possible to avoid an increase in the difference in behavior of expansion and contraction between loading and compression loading Pc loading. Thereby, the steel device 1 to which the present invention is applied makes it easy to manufacture the steel device 1 by setting the inclination angle θ of the bent portion 4 to 15 ° or more and 43 ° or less, and at the same time, the tensile load Pt. In contrast, the increase in the yield strength of the steel device 1 is suppressed, and the predetermined deformation performance of the steel device 1 can be secured for the compressive load Pc, thereby exhibiting stable energy absorption performance. It becomes possible.

  Since the steel device 1 to which the present invention is applied can suppress an increase in the tensile strength or compression strength more than necessary, the burden on the axial force member 2 to which the fixing unit 3 is attached is reduced. For this reason, the steel device 1 to which the present invention is applied can prevent the axial force member 2 from being damaged by plastically deforming the bent portion 4 in advance of the side surface 25 of the axial force member 2. It becomes.

  In the steel device 1 to which the present invention is applied, in particular, as shown in FIG. 5, each of the pair of fixing portions 3 is attached to the side surface 25 of the axial force member 2 by bolt joining. Thereby, even if the steel device 1 to which the present invention is applied is preceded by the side surface 25 of the axial force member 2 and the bent portion 4 is damaged by plastic deformation or the like, the damaged steel device 1 is used. Can be easily removed, and replacement with a new steel device 1 can be easily performed.

  The steel device 1 to which the present invention is applied uses a steel plate or the like bent and processed in the out-of-plane direction α without using a temperature-dependent viscoelastic damper or the like, so that the axial force member 2 can stably absorb energy. Performance can be imparted. Thereby, since the steel device 1 to which the present invention is applied can easily form the bent portion 4 by bending a steel plate or the like, the steel device 1 can be manufactured at a low manufacturing cost. It becomes.

  As shown in FIG. 6, the steel device 1 to which the present invention is applied has a large plasticization region when the bent portion 4 is deformed by bending the bent portion 4 at the fold 40 and bending it. Become. Moreover, the steel device 1 to which the present invention is applied suppresses an increase in yield strength due to work hardening by reducing a cumulative strain that is a combination of the strain when bending and the strain when the bent portion 4 is deformed. In addition, it is possible to enhance the resistance characteristic against low cycle fatigue.

  As shown in FIG. 2, the bearing wall 7 to which the present invention is applied is provided as a wall body of a building such as a steel house, a steel frame prefab, or a wooden house, and the present invention is applied to the brace material 20 that becomes the axial force member 2. An applied steel device 1 is provided. For this reason, the bearing wall 7 to which the present invention is applied allows the brace material 20 in the inner space 70 to exhibit a stable energy absorption performance, despite the fact that the tensile load Pt and the compressive load Pc act alternately, and is seismic resistant. It becomes possible to provide a wall of a building with improved performance.

  When the steel device 1 to which the present invention is applied is introduced into the load-bearing wall 7 of the steel house, the steel device 1 is provided on the axial force member 2 such as a thin lightweight steel plate. When the steel device 1 to which the present invention is applied is introduced into the load-bearing wall 7 of the steel prefab, as shown in FIG. 17 (a), the axial force member 2 is a square steel pipe, channel steel or H A steel frame material 21 such as a shape steel may be used. Furthermore, when the steel device 1 to which the present invention is applied is introduced into the load-bearing wall 7 of a wooden house, as shown in FIG. 17 (b), a wooden member 24 is used as the axial force member 2. Good.

  At this time, as shown in FIG. 17A, when the steel device 1 to which the present invention is applied is provided on a steel frame 21 such as an H-shaped steel, the side surface 25 of the flange 22 of the steel frame 21 or the web 23. The fixing unit 3 is attached to the side surface 25 of the lens. When the steel device 1 to which the present invention is applied is provided on the wooden material 24 as shown in FIG. 17B, the fixing unit 3 is attached to the outer side surface 25 at the end portion 27 of the wooden material 24. In addition, the fixing unit 3 may be attached to the inner side surface 25 such as the cutout groove 28 partially cut out at the end portion 27 of the wooden material 24.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be interpreted in a limited way.

1: Steel device 2: Axial force member 20: Brace material 21: Steel frame material 22: Flange 23: Web 24: Wooden material 25: Side surface 26: Hollow portion 27: End portion 27a: Reduced diameter portion 27b: Expanded diameter portion 28 : Notch groove 29: Core material 3: Fixing part 31: Bolt nut 4: Bending part 4a: Inclined surface 40: Crease 5: Stiffening material 5a: Chamfering 6: Joint metal 60: Flat steel 7: Bearing wall 70: Frame Inner space 70a: Upper part 70b: Lower part 71: Vertical frame 72: Horizontal frame X: Width direction Y: Depth direction Z: Axial direction

Claims (9)

A steel device provided on an axial force member on which a tensile load or a compressive load acts,
A fixing portion attached to a side surface of the axial force member, and a bent portion provided continuously from the fixing portion,
The bent portion is formed so as to protrude in the out-of-plane direction from the side surface of the axial force member, and when the tensile load or the compressive load acts on the axial force member, the bending portion expands and contracts in the axial direction of the axial force member. A steel device characterized by that. Further comprising a stiffener attached to the fixing unit,
The steel device according to claim 1, wherein the stiffener is provided in a state where the fixing portion is sandwiched between a side surface of an axial force member. 2. The fixing unit is provided as a pair on both sides in the axial direction of the bent portion, and each of the pair of fixing units is attached to a side surface of an axial force member by bolt joining. Or the steel device of 2. The fixing portion is provided as a pair on both sides in the axial direction of the bent portion,
The bent portion is formed at two locations that are continuous from each of the pair of fixing portions and at one location that is intermediate between the pair of fixing portions, and three folds that are bent in the out-of-plane direction are formed. The steel device according to any one of claims 1 to 3. The bent portion is formed at two folds that are continuous from each of the pair of fixing portions, and is inclined at an inclination angle of 15 ° or more and 43 ° or less with respect to the axial orthogonal direction of the axial force member. The steel device according to claim 4. The fixing portion is provided as a pair on both sides in the axial direction of the bent portion,
The bent portion is formed at two locations that are continuous from each of the pair of fixing portions and at two locations that are intermediate between the pair of fixing portions, and four folds that are bent in the out-of-plane direction are formed. The steel device according to any one of claims 1 to 3. The bent portion is formed with a fold that is bent in an out-of-plane direction, and a radius of curvature on an inner peripheral side of the fold is set to be equal to or larger than a plate thickness of the bent portion. The steel device according to any one of claims 1 to 6. It is a load-bearing wall provided as a wall of a building,
An axial force member to be a brace material on which a tensile load or a compressive load acts, and a steel device provided in a part of the axial direction of the axial force member,
The steel device has a fixing portion attached to a side surface of the axial force member, and a bent portion provided continuously from the fixing portion, and the bent portion is a surface from a side surface of the axial force member. A load bearing wall, characterized by being formed to protrude outwardly, and to be expanded and contracted in the axial direction of the axial force member when a tensile load or a compressive load is applied to the axial force member. The axial force member is provided with a core material in which a pair of end portions divided in the axial direction are spaced apart from each other and continuously inserted from one end portion to the other end portion. The load-bearing wall according to claim 8.

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