JP2017057660A - Earthquake-resistant and seismic-control structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake-resistant and seismic-control structure which secures the earthquake resistance and seismic controllability of a building and which can be installed in a space-saving manner.SOLUTION: An earthquake-resistant and seismic-control structure 10 for suppressing vibrations of a building includes: a bearing panel 20 which is fixed to a downside beam 4B or a foundation; a support member 30 which is connected to the bearing panel 20 and an upside beam 4A, which bears a horizontal force acting on the building, and which permits shear deformation of the upside beam 4A with respect to the bearing panel 20; and a viscoelastic damper 40 that is provided in parallel with the support member 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seismic / seismic structure that suppresses vibration of a building.

  2. Description of the Related Art Conventionally, earthquake-resistant structures are known in which a load-bearing member is installed in a frame surface surrounded by columns and beams or columns and foundations of a building to bear a horizontal force applied to the building. As such an earthquake-resistant structure, a structure in which two braces are attached to a frame in a frame surface and the braces bear a tensile force and a compressive force is known (for example, see Patent Document 1).

  Patent Document 1 discloses one in which both ends of a brace are connected to a structural frame via a preceding plastic deformation material that undergoes plastic deformation prior to the buckling of the brace.

Japanese Patent Laying-Open No. 2005-068941

  However, in the earthquake-resistant structure described in Patent Document 1, the building is stiff and strong and resists the horizontal force acting on the building, so that the building tends to be greatly shaken at the time of the earthquake. In the earthquake, the main frame (columns, beams, walls) was damaged, and there was a risk that extensive repair work would be required for the damaged parts after the earthquake.

  In order to suppress such shaking of the building and damage to the main frame, it is conceivable to construct a load-bearing structure on the frame surface and provide a damping damper on another frame surface adjacent to the frame surface. However, when the load bearing structure and the damping damper are installed on different frame surfaces, there is a problem that the effective installation area of the window is reduced.

  Therefore, there arises a technical problem to be solved, which is to provide a seismic / seismic structure that can be installed in a small space while ensuring seismic and seismic control of the building. The purpose is to solve.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is installed in a frame surface surrounded by a column and a beam or a foundation of a building to reduce vibration of the building. In the seismic / seismic structure to be suppressed, a precast concrete load-bearing panel fixed to the lower beam or the foundation, a viscoelastic damper connected to the load-bearing panel and the upper beam, and the viscoelastic damper in parallel Provided is a seismic / seismic structure comprising a support member that is disposed and bears a horizontal force acting on the building and allows shear deformation of the upper beam with respect to the load-bearing panel.

  According to this configuration, in the case of a small-scale earthquake, the support member allows relative displacement of the upper beam with respect to the load-bearing panel, that is, shear deformation of the upper beam, that is, deformation along the horizontal direction (horizontal deformation). At the same time, by bearing a horizontal force acting on the building, the load-bearing panel and the supporting member arranged in the frame surface ensure the earthquake resistance of the building. Moreover, when a slight shear deformation | transformation arises in an upper beam, the viscoelastic damper can ensure the damping property of a building by attenuating the shaking of an upper beam. Furthermore, by arranging the load-bearing panel, the viscoelastic damper, and the support member in the same frame, a large effective installation area of the window can be secured.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the support member includes a pair of upper and lower flanges respectively attached to the load-bearing panel and the upper beam, and the pair of upper and lower flanges. And providing a seismic / seismic structure having a web disposed thereon.

  According to this structure, at the time of a small-scale earthquake, the web is elastically deformed to allow the upper beam to be sheared and to bear a horizontal force. Further, when a slight shear deformation occurs in the upper beam, the web is plastically deformed and the viscoelastic damper attenuates the swing of the upper beam. Thereby, it is possible to ensure the earthquake resistance and vibration control of the building. Furthermore, since the horizontal force at the time of the earthquake is concentrated on the web, the repair after the earthquake can be completed only by replacing the damaged web.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect of the present invention, the web provides an earthquake-resistant / damping structure made of low yield point steel.

  According to this configuration, since the yield point of the web is lowered, the support member easily shifts from the elastic deformation region to the plastic deformation region, and the viscoelastic damper starts to attenuate the swing of the upper beam at an early stage. Vibration control can be obtained.

  According to a fourth aspect of the invention, in addition to the configuration of the second or third aspect of the invention, the web provides a seismic / seismic control structure in which a plurality of webs are provided side by side in the weak axis direction of the support member.

  According to this structure, at the time of a small-scale earthquake, a plurality of support members jointly bear the horizontal force acting on the building in a well-balanced manner. In addition, the support members arranged side by side in the weak axis direction easily shift from the elastic deformation region to the plastic deformation region, and the viscoelastic damper starts to attenuate the swing of the upper beam at an early stage. Thereby, it is possible to ensure the earthquake resistance and vibration control of the building.

  According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the invention, the support member is disposed in such a manner that the weak axis direction of the support member is aligned with the longitudinal direction of the upper beam. Provide damping structure.

  According to this configuration, the horizontal force generated in the building during the earthquake acts on the support member in parallel with the weak axis direction of the support member, so that the support member easily shifts from the elastic deformation region to the plastic deformation region, and viscoelasticity Since the damper starts to attenuate the upper beam swing early, it is possible to suppress the swing of the building.

  In the present invention, in the case of a small-scale earthquake, the support member allows the upper beam to be sheared and bears a horizontal force acting on the building, so that the load-bearing panel and the support member arranged in the frame are connected to the building. Ensure earthquake resistance. In addition, when a slight shear deformation occurs in the upper beam, the viscoelastic damper attenuates the shaking of the upper beam, thereby ensuring the vibration control of the building. Furthermore, by arranging the load-bearing panel, the viscoelastic damper, and the support member in the same frame, a large effective installation area of the window can be secured.

The schematic diagram which shows the building which applied the earthquake-proof / seismic control structure which concerns on one Example of this invention. It is drawing which shows the earthquake-proof / damping structure of FIG. 1, (a) is a front view, (b) is the sectional view on the AA line of FIG. 2 (a), (c) is FIG. It is a BB line sectional view of). It is drawing which shows a supporting member, (a) is a top view, (b) is a front view, (c) is a side view. It is drawing which shows a viscoelastic damper, (a) is a front view, (b) is a side view. It is a graph which shows the relationship between the load of the horizontal direction which acts on a supporting member, and a deformation amount. It is a figure which shows the mode of a deformation | transformation of the support member resulting from a horizontal force, (a) has shown a mode that the support member is elastically deformed, (b) has shown a mode that the support member is plastically deformed. ing.

  The seismic / seismic structure according to the present invention is designed to ensure the seismic and seismic performance of a building and to provide the seismic / seismic structure that can be installed in a small space. In a seismic / seismic structure that is installed in a frame surrounded by a beam or foundation and suppresses the vibration of the building, a precast concrete strength panel fixed to the lower beam or foundation, and a strength panel A viscoelastic damper coupled to the upper beam; and a support member disposed in parallel with the viscoelastic damper, which bears a horizontal force acting on the building and allows the upper beam to undergo shear deformation with respect to the load-bearing panel. This is realized.

  Hereinafter, a building 1 to which an earthquake-resistant / damping structure 10 according to an embodiment of the present invention is applied will be described with reference to the drawings. In the following examples, when referring to the number, numerical value, quantity, range, etc. of the constituent elements, the specific number is used unless otherwise specified and clearly limited to a specific number in principle. It is not limited, and it may be a specific number or more.

  In addition, when referring to the shapes and positional relationships of components, etc., those that are substantially similar to or similar to the shapes, etc., unless otherwise specified or otherwise considered in principle to be apparent. Including.

  Further, in order to make the features easy to understand, the drawings may be exaggerated by enlarging the characteristic portions or the like, and the dimensional ratios and the like of the constituent elements are not always the same. In the cross-sectional view, hatching of some components may be omitted in order to facilitate understanding of the cross-sectional structure of the components. In the present embodiment, the terms “upper” and “lower” correspond to the upper and lower sides in the vertical direction V.

  FIG. 1 is a schematic diagram showing a building 1. The building 1 is a steel structure (S structure) three-story house. The building 1 includes a foundation 2, pillars 3, and beams 4.

  A plurality of pillars 3 are arranged at predetermined intervals in the horizontal direction H. The column 3 is a square steel pipe extending in the vertical direction V. The base end of the column 3 is fixed to the foundation 2.

  A plurality of beams 4 are arranged in the vertical direction V with a predetermined interval. The beam 4 is H-shaped steel extended in the horizontal direction H. The pillar 3 and the beam 4 are integrally joined at an intersecting portion. In the following description, among the beams 4 constituting the frame S, the upper beam is referred to as the upper beam and A is added to the end of the reference number, and the lower beam is referred to as the lower beam and added to the end of the reference number. When B is attached and these are collectively referred to, only numerals are used as reference symbols.

  A frame surface S is formed between the column 3 and the foundation 2 or the beam 4. On the frame surface S, a load-bearing panel 20 made of precast concrete is arranged. In the vertical direction V of the building 1, the load-bearing panel 20 is installed at the same position. Further, in the horizontal direction H of the building 1, two load-bearing panels 20 are juxtaposed in the center, one at each end. In addition, the specific installation position of the load-bearing panel 20 is not limited to what was illustrated, and can be changed suitably.

  The load-bearing panel 20 is fixed to the lower beam 4 </ b> B or the foundation 2 through an angle 21 on the lower side. Further, the load-bearing panel 20 is joined to the upper beam 4 </ b> A via the support member 30 on the upper side.

  Viscoelastic dampers 40 are arranged in parallel with the support members 30 on the load-bearing panels 20 arranged at both ends in the horizontal direction H of the building 1. That is, half of the load-bearing panels 20 used for the entire building 1 are connected to the upper beam 4A through the support member 30 and the viscoelastic damper 40, and the remaining half are connected to the upper beam 4A through the support member 30 alone. It is connected.

  Next, a specific structure of the earthquake-resistant / damping structure 10 provided in the frame surface S will be described based on the drawings. FIG. 2 is a drawing showing the earthquake-resistant / damping structure 10. FIG. 3 is a view showing the support member 30. FIG. 4 shows the viscoelastic damper 40. In the following description, the load bearing panel 20 fixed to the lower beam 4B will be described, and the description of the load bearing panel 20 fixed to the foundation 2 will be omitted.

  The load-bearing panel 20 is disposed with a gap C between the columns 3 adjacent to each other in the horizontal direction H. The width of the gap C is set to be equal to or greater than the deformation amount corresponding to the yield point of the support member 30.

  An angle 21 for fixing the load-bearing panel 20 to the lower beam 4B is formed in a U-shaped cross section. The upper part of the angle 21 is joined to the load-bearing panel 20 via the anchor bolt B1. The lower part of the angle 21 is joined to the lower beam 4B via a bolt B2. The angle 21 is elongated along the horizontal direction H, and the shape change is small even when a horizontal force acts on the building 1.

  The support member 30 includes a pair of upper and lower flanges 31 and two webs 32 disposed between the pair of flanges 31. The support member 30 allows the upper beam 4A to be sheared by the web 32 being deformed in the horizontal direction H during an earthquake.

  The flange 31 is made of rolled steel for building structure (SN material). The upper flange 31 is joined to the upper beam 4A via a bolt B3. The lower flange 31 is joined to the load-bearing panel 20 via the anchor bolt B4.

  The web 32 is made of low yield point steel. The two webs 32 are arranged in parallel along the longitudinal direction L of the flange 31 at a predetermined interval. The web 32 is arranged so that the thickness direction of the web 32 and the longitudinal direction L of the flange 31 coincide. The web 32 has a small thickness dimension relative to the longitudinal dimension and is easily deformed in the thickness direction. That is, the weak axis of the support member 30 is formed along the longitudinal direction L of the flange 31. Reference numeral 33 in FIG. 3 is a mounting hole for the bolt B3, and reference numeral 34 is a mounting hole for the anchor bolt B4.

  The support member 30 is disposed between the upper beam 4A and the load-bearing panel 20 so that the weak axis direction of the support member 30 that matches the thickness direction of the web 32 matches the longitudinal direction of the upper beam 4A.

  The viscoelastic damper 40 converts vibration energy corresponding to the shaking of the upper beam 4A with respect to the load-bearing panel 20 into heat energy when a horizontal force acts on the building 1 due to an earthquake or the like. The viscoelastic damper 40 includes one inner steel plate 41, two outer steel plates 42, and a viscoelastic body 43 interposed between the inner steel plate 41 and the outer steel plate 42.

  The inner steel plate 41 includes a base portion 41a that is attached to the load-bearing panel 20 via the anchor bolt B5. The two outer steel plates 42 are connected via a base portion 42a attached to the upper beam 4A via bolts B6.

  The viscoelastic body 43 is a known viscoelastic rubber. The viscoelastic body 43 is bonded to the side surface 41 b of the inner steel plate 41 and the inner surface 42 b of the outer steel plate 42. The specific form of the viscoelastic damper 40 is not limited to the above. For example, the viscoelastic damper may be composed of two inner steel plates, three outer steel plates, and a viscoelastic body interposed between the inner steel plate and the outer steel plate. . Further, the inner steel plate may be attached to the upper beam, and the outer steel plate may be attached to the load-bearing panel. The viscoelastic damper 40 attenuates the shaking of the upper beam 4A when a slight shear deformation (horizontal deformation) occurs in the upper beam 4A. For example, when the viscoelastic body 43 is formed to have a width of 150 mm, a length of 120 mm, and a thickness of 20 m, the viscoelastic damper 40 exhibits a damping effect when a shear deformation of 0.2 mm or more occurs in the upper beam 4A.

  Next, the effect | action of the earthquake-proof / damping structure 10 is demonstrated based on drawing. FIG. 5 is a graph showing the relationship between the horizontal load acting on the support member 30 and the amount of deformation. FIG. 6 is a diagram showing a state of deformation of the support member 3 due to the horizontal force.

  The earthquake resistance required for the building 1 is ensured without considering the viscoelastic damper 40. That is, in the structural calculation based on the Building Standards Law Enforcement Ordinance, calculation of allowable stress level of each member as the primary design (maximum stress level of columns, beams, load-bearing panels etc. of each floor ≦ allowable stress level of each member), And, the horizontal force calculation (interlayer deformation angle of each floor ≦ 1/200 (or 1/120)) as the secondary design is equivalent to a building constructed with the pillar 3, the beam 4, the load-bearing panel 20 and the support member 30. It is calculated as a thing, and earthquake resistance is secured.

  The support member 30 has an elastic deformation area A1 and a plastic deformation area A2 as shown in FIG. As shown in FIG. 6A, when a horizontal force F acts on the building 1 due to a small-scale earthquake, the deformation amount ΔL1 of the support member 30 is within the elastic deformation region A1, and the support member 30 is elastically deformed. Further, the viscoelastic body 43 of the viscoelastic damper 40 is shear-deformed by a deformation amount ΔL1 to attenuate the swing of the upper beam 4A. When the shaking of the building 1 converges, the support member 30 returns to the original shape shown in FIG.

  On the other hand, as shown in FIG. 6B, when an excessive horizontal force F acts on the building 1, the deformation amount ΔL2 of the support member 30 exceeds the elastic deformation area A1 and reaches the plastic deformation area A2. When the upper beam 4A is displaced until the support member 30 reaches the plastic deformation area A2, the viscoelastic body 43 of the viscoelastic damper 40 provided in parallel with the support member 30 undergoes shear deformation, thereby causing the upper beam 4A to sway. Attenuate.

  That is, in the elastic deformation area A1 of the support member 30, the support member 30 is elastically deformed and bears the horizontal force of the upper beam 4A and allows shear deformation of the upper beam 4A, and the viscoelastic damper 40 prevents the building 1 from shaking. Attenuate. Further, in the plastic deformation region A2 of the support member 30, the viscoelastic damper 40 attenuates the shaking of the building 1. Further, when the displacement of the upper beam 4A is particularly large, that is, when the deformation amount of the shear deformation of the upper beam 4A substantially coincides with the gap C, the load-bearing panel 20 receives the tilted column 3 to Shake can be suppressed.

  In the horizontal force calculation, the value obtained by dividing the deformation amount ΔL1 of the support member 30 by the height h of the support member 30 is the interlayer deformation angle, and this value is 1/200 (or 1/120) or less. Perform seismic design. Therefore, when the damping effect of the viscoelastic damper 40 is desired to be exhibited with a small amount of deformation, the interlayer deformation angle corresponding to the yield point of the support member 30 is designed to match 1/200 (or 120). preferable.

  As a method for adjusting the rigidity of the support member 30, it is conceivable to change the material or orientation of the web 32 or to adjust the number of webs 32 installed. The material of the web 32 may be an SN material in addition to the low yield point steel. In addition to installing two webs 32 between the flanges 31, only one web 32 may be installed, or three or more webs 32 may be installed. By changing these arbitrarily according to the size of the frame surface S and the like, the support member 30 having desired rigidity can be obtained.

  Further, the web 32 may be formed in a drum shape, that is, so as to gradually widen from the center of the web 32 toward the flange 31. Thereby, when an earthquake occurs, the transition of the web 32 from the elastic deformation area A1 to the plastic deformation area A2 gradually proceeds in the vertical direction from the center of the web 32, so that the strength of the entire web 32 can be improved.

  In this way, according to the present invention, the web 32 elastically deforms to allow shear deformation of the upper beam 4A and bears a horizontal force and supports the load-bearing panel 20 disposed in the frame S in the case of a small-scale earthquake. The member 30 can ensure the earthquake resistance of the building 1.

  Further, when a slight shear deformation occurs in the upper beam 4A, the web 32 is plastically deformed and the viscoelastic damper 40 attenuates the vibration of the upper beam 4A. it can.

  Further, by arranging the load-bearing panel 20, the support member 30, and the viscoelastic damper 40 in the same frame S, a large effective installation area of the window can be ensured.

  Further, since the horizontal force during the earthquake is concentrated on the web 32, the repair after the earthquake can be completed only by replacing the damaged web 32.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

DESCRIPTION OF SYMBOLS 1 ... Building 2 ... Foundation 3 ... Column 4 ... Beam 4A ... Upper beam 4B ... Lower beam 10 ... Earthquake resistance / damping structure 20 ... Strength panel 30. .. Support member 31 ... Flange 32 ... Web 40 ... Viscoelastic damper 41 ... Inner steel plate 42 ... Outer steel plate 43 ... Viscoelastic body

Claims (5)

In the seismic / seismic structure that is installed in the frame surrounded by the pillars and beams or foundations of the building to suppress the vibration of the building,
A load-bearing panel made of precast concrete, fixed to the lower beam or foundation;
A viscoelastic damper connected to the load-bearing panel and the upper beam;
A support member arranged in parallel with the viscoelastic damper, bearing a horizontal force acting on the building, and allowing shear deformation of the upper beam with respect to the load-bearing panel;
Seismic and vibration control structure characterized by having The support member is
A pair of upper and lower flanges respectively attached to the load-bearing panel and the upper beam;
A web disposed between the pair of upper and lower flanges;
The earthquake-resistant and vibration-damping structure according to claim 1, comprising:   The earthquake-resistant / seismic structure according to claim 2, wherein the web is made of low yield point steel.   The earthquake-resistant / damping structure according to claim 2 or 3, wherein a plurality of the webs are provided side by side in the weak axis direction of the support member. The earthquake-resistant / damping structure according to claim 1, wherein the support member is disposed so that a weak axis direction of the support member and a longitudinal direction of the upper beam coincide with each other.