KR101045821B1 - Brace assembly construction method for seismic reinforcement - Google Patents

Abstract

The present invention, by introducing a tension force to the brace, or by introducing a tension force to the brace and frame assembly, as well as the strength and stiffness to the lateral load of the structure, as well as greatly improves the interlayer displacement that can exhibit the reinforcement capacity without lowering the strength during fracture load of the structure. The present invention relates to a method for constructing a brace assembly for seismic reinforcement which improves the convenience of transportation and construction by separating and transporting the frame assembly in pieces to be installed in the field.

Description

Brace assembly construction method for earthquake-resistant reinforcement {CONSTRUCTION METHOD OF BRACE ASSEMBLY FOR SEISMIC RETROFITTING}

The present invention relates to a method for constructing a brace assembly for seismic reinforcement, and more particularly, to introduce a tension force to a brace or to introduce a tension force to a brace and a frame assembly, as well as the strength and stiffness of the lateral load of the structure, as well as the breaking load of the structure. The seismic reinforcement brace assembly construction method which can greatly improve the interlayer displacement that can exert reinforcement capacity without deterioration of the load and improve the convenience of transportation and construction by separating the frame assembly in pieces and transporting it on site. It is about.

In general, existing building structures such as multi-unit houses, buildings, buildings, apartments, etc. are not expected to have earthquake-resistant design to safely protect the building structures from earthquakes. Therefore, there is a need to reinforce building structures to resist seismic loads.

In Korea, earthquake-resistant regulations have been revised since applying the earthquake-related regulations in the 1990 Building Act, and in 2005, the seismic-related regulations have been actualized and strengthened. Since these seismic design codes are applied to new buildings, the buildings constructed before the introduction of seismic design codes are designed and constructed without considering the effects of earthquakes, and deterioration damages are caused by the increase in the number of public years. It is considered that the seismic performance is not properly exhibited. The proportion of buildings without seismic design was found to be about 80% of the total buildings.

Unexpected earthquakes in these buildings are expected to result in significant economic and social losses from reconstruction, as well as direct damage from collapse and breakage. In particular, in case of major national facilities, the economic and social losses on the whole country are enormous when damage occurs. In response, the National Emergency Management Agency drafted the Earthquake Disaster Countermeasures Act, which supplements the earthquake-related regulations under the Natural Disaster Countermeasures Act, and is promoting earthquake-resistant reinforcement to meet seismic design standards for critical facilities of the country. It is time to make a multifaceted study on the seismic reinforcement method for existing buildings and facilities, as evaluations and reinforcement or supplementation are recommended.

Unlike the seismic design method applied to new buildings, the seismic reinforcement method requires reinforcement of existing buildings or facilities. Therefore, consideration of usability, economic feasibility, consideration of constructability are required, and specificity of existing buildings and facilities is considered. It is necessary to select the appropriate method.

Among them, as a method for seismic reinforcement of existing structures, a method of installing a seismic reinforcing brace inside the opening of a structure consisting of beams and columns is mainly used. However, these conventional seismic reinforcement braces are made in one piece, which makes it difficult to transport and construct them, and a sudden drop in strength due to the buckling fracture mode of the compression-side brace is generated. Incompletely designed, unstable joints with braces due to deformation when stress is introduced into the frame to compensate for the restraint force, and additional stress on beams and columns of existing structures when stress is introduced after installation on the structure.

Therefore, there is a demand for development of a brace method that exhibits more practical and excellent seismic performance by improving or eliminating the problems in the conventional seismic reinforcing brace.

The present invention is to solve the above problems, an object of the present invention is to provide a seismic reinforcement brace assembly construction method that the frame is separated into a plurality of pieces to improve the convenience of transportation and construction.

Another object of the present invention is to provide a method for constructing a brace assembly for seismic reinforcement, which can increase the shear strength of a lateral load of a structure.

Still another object of the present invention is to provide a method for constructing a brace assembly for seismic reinforcement, which can greatly improve the interlayer displacement that can exert reinforcing ability without breaking strength of the structure as well as strength and rigidity against lateral load of the structure. It is.

According to a feature of the present invention for achieving the above object, the present invention relates to a method for constructing a seismic reinforcement brace assembly, forming a frame assembly having an outer shape smaller than the open surface of the structure to be installed; Connecting braces to upper and lower corners of the upper and lower centers of the frame assembly, respectively; Introducing tension into the brace; And filling the mortar-based material between the structure and the frame assembly to integrate the structure and the frame assembly.

At this time, in the frame assembly forming step, further comprising the step of providing a brace connecting steel plate formed with fastening holes in the upper and lower corners of the upper center and lower edge of the frame assembly, the braces, the opposite ends of the threads The formed steel bar, and a screw thread corresponding to one end of the steel bar is formed at one end, and the other end includes a connecting steel formed with a connection hole to be rotatably connected to the brace connecting steel plate, in the brace connecting step, The connection steel is fastened to each end of the connection steel and the connection steel is connected to the fastening hole of the connection steel plate and the brace connection steel plate to be rotatably fastened with respect to the brace connection steel plate, and the tension force is introduced. In the step, the steel bar is rotated in one direction to the connecting steel Impart tension to the rod.

And the rod of the brace, a first tension introducing device capable of rotating the rod in the intended direction may be mounted.

On the other hand, the frame assembly forming step, the first mounting bracket is installed on one end of the outer surface of the frame assembly further comprises the step of installing a second tension tension introducing device on the outer surface of the frame assembly adjacent to the first mounting bracket and After the tension force introduction step, one end is fixed to the first mounting bracket, while the other end is fixed to the second tension force introduction device while the outer surface of the frame assembly is installed to install a tension member; And providing a tension force to the tension member by operating the second tension force introduction device.

Alternatively, after the tension force introducing step, installing a first mounting bracket on one end of the frame assembly and installing a second tension force introducing device adjacent to the first mounting bracket; Fixing one end to the first mounting bracket, and fixing the other end to the second tension-tension introducing device while surrounding the outer surface of the frame assembly to install a tension member; And providing a tension force to the tension member by operating the second tension force introduction device.

On the other hand, after the step of introducing the force, the step of installing a plurality of through-type brackets on each side of the frame assembly; Inserting a threaded tension steel into the through-type bracket on each side of the frame assembly; And inserting nuts at both ends of the tension steel, respectively, and applying a tension force to the tension steel by rotating the other nut while one nut is supported by the through-type bracket.

In the frame assembly forming step, a second mounting bracket is installed at one end of an outer surface of the frame assembly, a rotating roller is installed at a lower center of the upper end of the frame assembly, and a third mounting bracket is installed at one of the edges of the bottom of the frame assembly. And installing a through hole in the other corner, and in the brace installation step, the tension member is fixed to the second mounting bracket and passes through the through hole in an outer surface of the frame assembly. And it is fixed to the third mounting bracket in the state where the third tension force introduction device is interposed via the rotating roller, and in the tension force introduction step, it is possible to apply the tension force to the tension material by operating the third tension force introduction device.

In addition, in the frame assembly forming step, the rotating roller is installed in the lower center of the upper end of the frame assembly, and further comprising the step of installing the fourth and fifth mounting brackets on each of the upper corners of the lower end of the frame assembly, the brace In the connecting step, further comprising the step of fixing the tension member to the fourth mounting bracket and the fifth mounting bracket with the fourth tensioning force introducing device via the rotating roller, in the tension force introduction step, Operating the fourth tension force introduction device to impart tension force to the tension member, and after the tension force introduction step, installing a plurality of through-type brackets on each side of the frame assembly; Inserting a threaded tension steel into the through-type bracket on each side of the frame assembly; And inserting nuts at both ends of the tension steel, respectively, and applying a tension force to the tension steel by rotating the other nut while one nut is supported by the through-type bracket.

In addition, in the frame assembly forming step, the mortar bonding bolt is mounted on the outer surface, and the frame assembly is formed by joining the pieces of the frame divided into a plurality of pieces.

According to the seismic reinforcement brace assembly construction method according to the present invention, by separating the frame into a plurality of pieces to improve the convenience of transportation and construction, not only can reduce the cost and air for transportation and construction of the frame, There is an advantage that can cope with the error of the field structure.

And according to the present invention, it is possible to increase the shear strength of the lateral load of the structure has the effect of improving the lateral load resistance.

In addition, according to the present invention, not only the strength and stiffness of the lateral load of the structure, but also can exhibit a reinforcement ability to greatly improve the interlayer displacement without a decrease in strength during breakdown load of the structure, even if the displacement exceeding the maximum load of the RC structure There is an advantage that can increase the safety of the structure by exhibiting seismic performance.

1 is a flowchart illustrating a first embodiment of the seismic reinforcement brace assembly construction method according to the present invention.
2 is a front view of the brace assembly according to the first embodiment.
3 is a front view showing step by step the construction procedure of the brace assembly according to the first embodiment.
Figure 4 is a flow chart for explaining a second embodiment of the seismic reinforcement brace assembly construction method according to the present invention.
5 is a front view showing the configuration of the brace assembly according to the second embodiment.
Figure 6 is a flow chart for explaining a third embodiment of the seismic reinforcement brace assembly construction method according to the present invention.
7 is a front view showing the configuration of the brace assembly according to the third embodiment.
8 is a flowchart illustrating a fourth embodiment of the seismic reinforcement brace assembly construction method according to the present invention.
9 is a front view showing the configuration of the brace assembly according to the fourth embodiment.
10 is a perspective view showing the configuration of the brace assembly according to the fourth embodiment.
11 is a flowchart illustrating a fifth embodiment of the seismic reinforcement brace assembly construction method according to the present invention.
12 is a front view showing the configuration of the brace assembly according to the fifth embodiment.
13 is a perspective view showing the configuration of the brace assembly according to the fifth embodiment.
14 is a view showing a model of the target structure in the program, Figure 14 (a) is a model according to the construction method of the brace assembly in the first embodiment, Figure 14 (b) is a second The model is modeled according to the construction method of the brace assembly in the embodiment, Figure 14 (c) is modeled according to the construction method of the brace assembly in the third embodiment, Figure 14 (d) is a brace assembly The model shows the model of the reinforced RC structure.
FIG. 15 is a graph illustrating a result of nonlinear static analysis of the modeling form of FIG. 14.
FIG. 16 is a view illustrating a test specimen for a cyclic load experiment, in which FIG. 16A illustrates a comparative brace and FIG. 16B illustrates a brace assembly according to the first embodiment.
17 is a view showing a fracture pattern of the RC structure before and after the reinforcement of the brace assembly, Figure 17 (a) shows the fracture pattern of the unreinforced RC structure, Figure 17 (b) is a RC structure to which the comparative brace is applied Figure 17 shows the fracture pattern of Figure 17 (c) shows the fracture pattern of the RC structure to which the brace assembly according to the first embodiment is applied.
FIG. 18 is a graph showing a load-displacement relationship curve of RC structures before and after reinforcement of the brace assembly. FIG. 18A shows a load-displacement relationship curve of the unreinforced RC structure. 18 (b) shows the load-displacement relationship curve of the RC structure to which the comparative brace is applied, and FIG. 18 (c) shows the load-displacement relationship curve of the RC structure to which the brace assembly is applied according to the first embodiment.
FIG. 19 is a graph showing the load-story drift relationship curves of RC structures before and after reinforcement of the brace assembly. FIG.

Hereinafter, with reference to the accompanying drawings with respect to the earthquake-resistant reinforcement brace assembly construction method according to the invention will be described.

First Embodiment

First, a first embodiment of the seismic reinforcement brace assembly construction method according to the present invention will be described.

1 is a flowchart illustrating a first embodiment of the seismic reinforcement brace assembly construction method according to the invention, Figure 2 is a front view of the brace assembly according to the first embodiment, Figure 3 according to the first embodiment It is a front view which shows the construction sequence of a brace assembly step by step.

As shown, the seismic reinforcement brace assembly construction method according to the present invention, first starts from the step of forming the frame assembly 10 having a smaller shape than the open surface of the structure to be installed. The frame assembly 10 is formed by bonding the mortar bonding bolts 12 on the outer surface, and joining the pieces of the frame (11, see Fig. 3 (a)) divided into a plurality of pieces. At this time, as shown in Figure 3 (b), the pieces between the frame 11 is joined in a manner of fastening with a bolt 14 by applying a steel plate 13 for the joint.

And the cross-sectional shape of the frame used in the frame assembly 10 is not particularly limited, in this embodiment H-shaped steel was used, the web (web) was constructed in a form that is perpendicular to the structure (step S110).

In addition, the steel plate 15 for brace connection having a fastening hole 15a is mounted on both upper and lower corners of the upper and lower centers of the frame assembly 10. In this case, the brace connecting steel plate 15 may be mounted to protrude the reinforcing blade 16 to support the brace 20 when the brace 20 receives a compressive load in the brace installation direction. When H-shaped steel is used as the frame as in the present embodiment, the brace connecting steel plate 15 is mounted on a flange.

As such, when transported in the form of a piece frame 11 to be assembled in the field, the transport and construction work is convenient, it is possible to reduce the cost and air according to the transport and construction. In other words, by using the engraving frame 11, it does not require a large heavy equipment such as a crane required for the installation of the entire frame.

In addition, in structures that require seismic reinforcement, errors often occur in the area of the open part due to lack of construction ability, and the errors are different from each other in the same structure. Therefore, since the piece frame 11 can cope with the above error while assembling the steel plate 13 for the joint in the field, it is possible to maintain uniform quality even for the structure having the error (step S111).

The upper and lower center and lower ends of the frame assembly 10 are connected to the braces 20, respectively, as shown in (c) of FIG. Here, the brace 20 according to the present embodiment is a steel rod 21 is formed on both ends of the threaded rods in opposite directions, and one end is formed with a thread corresponding to one end of the steel bar 21 and the other end of the steel plate for the brace connection It is configured to include a connecting steel (22) formed with a connection hole (not shown) so as to be connected to the rotation 15.

Therefore, the connection of the brace 20, fastening the connection steel 22 to each end of the steel bar 21, the connection hole 15a of the connection hole of the connection steel material 22 and the brace connecting steel plate 15. The connecting steel 22 is connected to the brace connecting steel plate 15 so as to be rotatable through the coupling member 22a (for example, a bolt or a pin).

The thread formed in the steel bar 21 is a male thread, and the thread formed in the connecting steel 22 is a female thread (step S120).

Tension force is introduced into the braces 20 connected in this way. Introduction of the tension force to the brace 20 is carried out in such a way that the steel bar 21 of the brace rotates in one direction on the connecting steel 22. That is, since both ends of the steel bar 21 are formed with threads in opposite directions to each other, and the connection steel 22 has a thread corresponding to the threads, so that the connection is made by rotating the steel bar 21. At the same time, it can be inserted or released toward the steel material 22. Accordingly, when the steel bar 21 is rotated in the direction of insertion into the connecting steel 22, a tensile force is applied to the steel bar 21, and when the steel bar 21 is rotated in a direction away from the steel bar 21, a compressive force is applied to the steel bar 21. The tension is applied to the steel bar 21.

At this time, the steel bar 21 of the brace, a first tension introducing device 23 capable of rotating the steel bar 21 in the intended direction may be mounted (step S130).

After the tension is applied to the brace 20, a mortar-based material is filled between the structure and the frame assembly to integrate the structure and the frame assembly. At this time, it is preferable that the mortar-based material is poured in a state in which the mortar bonding bolt 12 is mounted on the frame assembly, and the mortar bonding bolt (not shown) is also mounted on the structure.

In addition, general mortar may be used as the mortar material, and a strain-hardening cementment composite (SHCC) that has been proven to have excellent joint reinforcement ability and crack control ability may be used.

In addition, the inflow of the mortar-based material may be made by a spraying method, and a formwork may be additionally installed on one surface to prevent leakage of the mortar-based material (step S140).

Second Embodiment

Next, a second embodiment of the seismic reinforcement brace assembly construction method according to the present invention will be described. In the present embodiment, the same reference numerals are used for the components corresponding to the first embodiment.

4 is a flowchart illustrating a second embodiment of the seismic reinforcement brace assembly construction method according to the present invention, Figure 5 is a front view showing the configuration of the brace assembly according to the second embodiment. In FIG. 5, in order to express the shape of each component, the flange constituting the front surface of the frame assembly is omitted.

As shown, in the present embodiment, in the frame assembly forming step, the frame assembly 10 is formed (step S210), but fastening holes 15a are formed at the upper center lower portion and both corner upper portions of the frame assembly 10. The step (step S211) of providing the steel plate 15 for brace connection is the same as in the first embodiment.

However, in this embodiment, unlike the first embodiment, the first mounting bracket 24 is installed at one end of the outer surface of the frame assembly 10 and adjacent to the first mounting bracket 24 of the frame assembly 10. The second tension force introducing device 25 is installed on the outer surface. In this case, the first mounting bracket 24 and the second tension-tension introduction device 25 may be mounted on the same surface of the frame assembly 10 at regular intervals, as shown in FIG. It may be mounted on different sides of the assembly 10.

At the edge of the frame assembly 10, the curved curved steel 26 may be mounted to prevent the damage of the tension member 27 while the tension member 27 may be moved when the tension force 27 is introduced into the frame assembly 10. (Step S212).

At this time, the first mounting bracket 24, the second tension-tension introduction device 25 and the curved curved steel 26 may be mounted to the frame assembly 10 after the tension force introduction step, not the frame assembly forming step. have.

After that, the steps of connecting the brace and introducing the tension force (steps S220 and S230) are the same as in the first embodiment.

However, in the present embodiment, after the tension force introduction step, one end is fixed to the first mounting bracket 24, and the other end is wrapped around the outer surface of the frame assembly 10, and the second tension force introduction device 25 is provided. The tension member 27 is fixed to (step S240).

Then, the installed tension member 27 operates the second tension force introduction device 25 to impart tension force to the tension member 27. Therefore, the frame assembly 10 is restrained while the tension member 27 is tense (step S2410).

As described above, since the frame assembly 10 is integrated with the structure in a state in which the frame assembly 10 is restrained by the tension member 27 (step S250), the frame assembly 10 and the tension member 27 exert additional stress against the lateral load. This makes it possible to realize improved lateral resistance compared with the first embodiment.

Third Embodiment

Next, a third embodiment of the seismic reinforcement brace assembly construction method according to the present invention will be described. In the present embodiment, the same reference numerals are used for the same components as the first embodiment.

6 is a flowchart illustrating a third embodiment of the seismic reinforcement brace assembly construction method according to the present invention, Figure 7 is a front view showing the configuration of the brace assembly according to the third embodiment. In FIG. 7, in order to express the shape of each component, the flange constituting the front surface of the frame assembly is omitted.

As shown, forming the frame assembly 10 in the present embodiment (step S310), the step of installing the steel plate 15 for the brace connection (step S311), the step of connecting the brace 20 (step S320 ), The step of introducing the tension force to the brace 20 (step S330) and the step of integrating the structure and the frame assembly 10 (step S350) is the same as the first embodiment.

However, in the present embodiment, a tension force is applied to each surface of the frame assembly 10 in the first embodiment through the tension steel 29.

In more detail, after the tension force introduction step, a plurality of through-type brackets 28 are installed on each side of the frame assembly 10. Two or three through-hole brackets 28 are mounted on one surface of the frame assembly. At this time, the through bracket 28 may be mounted in advance in the forming step of the frame assembly (step S340).

In addition, the threaded tension steel 29 is inserted into the through-type bracket 28 on each side of the frame assembly 10 (step S341).

The nut 30 is inserted into both ends of the tension steel 29 so that the nut 30 is rotated while the other nut 30 is supported by the through bracket 28. Tension is given to (29). At this time, the spring washer 31 is inserted prior to the insertion of the nut 30 to exert an elastic force on the nut 30 to prevent the nut 30 from loosening. And although the hexagon nut was used in this embodiment as the nut 30, other shapes of nuts or other members may be used as long as the ease of rotation is ensured.

In this case, as shown in FIG. 7, when the nut 30 is installed on the outer side of the through-type bracket 28 to tighten the nut 30, a tension force is applied to the tension steel 29 and the frame assembly 10. Tension is given to the step (step S342).

As such, in the present embodiment, since the frame assembly 10 is integrated with the structure in a state in which tension is applied by the tension steel 29, the tension steel 29 and the frame assembly 10 may be subjected to additional stress against lateral load. This makes it possible to realize improved lateral resistance compared with the first embodiment.

Fourth Embodiment

Next, a fourth embodiment of the seismic reinforcement brace assembly construction method according to the present invention will be described. In the present embodiment, the same reference numerals are used for the same components as those of the first and second embodiments.

8 is a flow chart for explaining a fourth embodiment of the seismic reinforcement brace assembly construction method according to the present invention, Figure 9 is a front view showing the configuration of the brace assembly according to the fourth embodiment, Figure 10 is a fourth A perspective view showing the configuration of the brace assembly according to the embodiment. In FIG. 9, in order to express the shape of each component, the flange constituting the front surface of the frame assembly is omitted.

As shown, in the present embodiment, the forming step of the frame assembly 10 (step S410) and the step of integrating the structure and the frame assembly 10 (step S440) are the same as in the first embodiment, and the frame assembly 10 Although similar to the second embodiment in that the tension member 27 is used on the outer surface of the), the tension and brace roles of the frame assembly 10 are performed in such a manner that the tension member 27 is performed together. It is different from the second embodiment.

In more detail, in the frame assembly forming step, the second mounting bracket 32 is installed at one end of the outer surface of the frame assembly 10, and the rotary roller 33 is disposed at the lower center of the upper end of the frame assembly 10. The third mounting bracket 34 is installed at one of the edges of the bottom of the frame assembly 10, and the through hole 17 is formed at the other edge thereof.

In this case, the through hole 17 is preferably formed at an edge adjacent to the second mounting bracket 32.

In addition, at the corners of the frame assembly 10, the curved curved steel 26 may be mounted to prevent the damage of the tension member 27 while the tension member 27 may be moved when a tension force with respect to the tension member 27 is introduced. It may be (step S411).

And in the brace installation in this embodiment, the tension member 27 is fixed to the second mounting bracket 32 and the through hole 17 is passed through the outer surface of the frame assembly 10, the through The third mounting bracket (3) with a third tension force introduction device (35) interposed between the tension member (27) passing through the ball (17) into the frame assembly (10) via the rotary roller (33). 34). At this time, the third tension force introduction device 35 may be installed before passing through the rotary roller 33 (step S420).

Thereafter, the third tension force introduction device 35 is operated to impart tension force to the tension member 27. At this time, when the third tension force introduction device 35 is operated, the tension assembly 27 installed inside the frame assembly 10 as well as the tension member 27 installed around the outer surface of the frame assembly 10 are tensioned together and the frame assembly 10. ) Is bound (step S430).

In the present embodiment as described above, the restraint and tension of the frame assembly 10 and the role of the brace is performed by one tension member 27, the frame assembly 10 is a structure in a state in which the tension force is applied by the tension member 27 Since the tension member 27 and the frame assembly 10 exert an additional stress against the lateral load, the lateral resistance can be more improved than in the first embodiment.

Fifth Embodiment

Next, a fifth embodiment of the seismic reinforcement brace assembly construction method according to the present invention will be described. In the present embodiment, the same reference numerals are used for the same components as those of the first, third and fourth embodiments.

11 is a flowchart illustrating a fifth embodiment of the seismic reinforcement brace assembly construction method according to the invention, Figure 12 is a front view showing the configuration of the brace assembly according to the fifth embodiment, Figure 13 is a fifth A perspective view showing the configuration of the brace assembly according to the embodiment. 12, the flange constituting the front surface of the frame assembly is omitted in order to express the shape of each component.

As shown, the forming step (step S510) of the frame assembly 10 and the step of integrating the structure and the frame assembly 10 (step S550) in the present embodiment are the same as in the first embodiment. In this embodiment, the brace form in the fourth embodiment and the tension form of the frame assembly 10 in the third embodiment are combined.

In more detail, in the frame assembly forming step, the rotary roller 33 is installed at the lower center of the upper end of the frame assembly 10, and the fourth and fifth mounting bras are disposed on both corners of the lower end of the frame assembly 10. The collars 36 and 37 are respectively installed (step S511).

Then, the tension member 27 is fixed to the fourth mounting bracket 36 and fixed to the fifth mounting bracket 37 with the fourth tension force introducing device 38 interposed via the rotating roller 33. . At this time, it is natural that the fourth tension force introducing device 38 may be installed before the rotary roller 33 passes (step S520).

Thereafter, the fourth tension force introduction device 38 is operated to impart tension force to the tension member 27. As a result, a tension force is applied to the tension member 27, thereby enabling the brace to resist deformation of the frame assembly 10 against lateral load (step S530).

On the other hand, after the tension force introduction step (step S530), a plurality of through-type brackets 28 are installed on each surface of the frame assembly 10. Two or three through-hole brackets 28 are mounted on one surface of the frame assembly. In addition, the through bracket 28 may be mounted in advance in the forming step of the frame assembly (step S540).

In addition, the threaded tension steel 29 is inserted into the through-type bracket 28 on each side of the frame assembly 10 (step S541).

The nut 30 is inserted into both ends of the tension steel 29 so that the nut 30 is rotated while the other nut 30 is supported by the through bracket 28. Tension is given to (29). At this time, the spring washer 31 is inserted prior to the insertion of the nut 30 to exert an elastic force on the nut 30 to prevent the nut 30 from loosening. And in the present embodiment with the nut 30, a hexagon nut is used.

In this case, as shown in FIG. 12, when the nut 30 is installed on the outer side of the through bracket 28 and tightens the nut 30, a tension force is applied to the tension steel 29 while the frame assembly 10 is applied. Tension force is imparted to (step S542).

As such, in the present embodiment, since the frame assembly 10 is integrated into the structure in a state in which tension is applied by the tension steel 29, the tension steel 29 is combined with the stress caused by the tension material 27 against the lateral load. And the frame assembly 10 is to exert an additional stress it is possible to realize a more improved lateral resistance capability than the first embodiment.

Simulation of Steel Rod Brace Reinforced RC Ramen Structure

Among the five embodiments described above, the behavior characteristics caused during reinforcement of the detailed earthquake-resistant RC structure 40 by the construction method of the steel bar brace assembly described in the first, second and third embodiments are quantitatively. In order to predict and evaluate the results, nonlinear static analysis was performed.

Nonlinear static analysis is the most common method to analyze the inelastic behavior of structures by reflecting the toughness of materials and the indefiniteness of structures. The program used to perform the nonlinear static analysis is MIDAS / GEN Ver. 785, and the target structure 40 is modeled on the program in FIGS. 14A to 14D. Here, FIG. 14A illustrates a model modeled according to the construction method of the brace assembly in the first embodiment (hereinafter referred to as 'brace 1'), and FIG. 14B illustrates the brace assembly in the second embodiment. Is modeled according to the construction method of the (hereinafter referred to as "brace 2"), Figure 14 (c) is a model modeled according to the construction method of the brace assembly in the third embodiment (hereinafter referred to as "brace 3") (D) shows a model of the RC structure reinforced with the brace assembly.

The actual structure vibrates in three dimensions, but in this experiment, the columns and beams were converted to wire rods and modeled as planar frames considering only horizontal seismic forces. At this time, displacement incremental method was used for lateral load, and earthquake load was calculated based on KBC 2009.

As a result of performing the nonlinear static analysis in this manner, as shown in FIG. 15, the shear strength of the non-seismic detailed RC structure 40 was found to be 211.75 kN. For RC structures with reinforced brace assemblies, braces 1, 2, and 3 showed 399.92 kN, 477.27 kN, and 544.13 kN, respectively. This is an increase of 89%, 125% and 157%, respectively, before the reinforcement. The displacement at maximum lateral load was found to be similar to the non-reinforced, non-reinforced detailed RC structures.

<Repeated Load Test on RC Ramen Structure Reinforced Bar Brace Assembly>

As shown in the above simulation results, the applicability of the construction method of the developed steel bar brace assembly was evaluated to be excellent. Therefore, performance verification experiments were conducted to examine the suitability of the analysis results and analysis procedures as described above and to ensure the reliability of the development method.

In order to apply the construction method of the steel bar brace assembly, a one-stage, one-span RC ramen structure 40 was fabricated, and the RC ramen structure was planned to have non-seismic detail that does not apply the current seismic design rule. The steel rod brace assembly and the size of the RC structure test specimen were manufactured in 1/3 scale of the actual structure in consideration of the capacity of the actuator, which is a cyclic loading force machine, of 1,000 kN.

And the first embodiment of the simplest form of the construction method of the brace assembly according to the present invention was tested as the brace 1. On the other hand, as a comparative form for the brace 1, as shown in Fig. 16 (a), the shape of the frame assembly is the same as the brace 1, it is fixed to the steel sheet for brace connection without being applied to the steel rod brace . This form by the brace method will be referred to as 'comparison brace'. And in Figure 16 (b), the brace 1 is shown for comparison with the comparison brace shown in Figure 16 (a).

In the failure pattern for the non-reinforced RC structure thus prepared and the RC structure reinforced by the brace 1 and the comparative brace, respectively, as shown in (a) to (c) of FIG. No big difference was found between the process and the process by the development brace assembly.

Experimental results for the load-displacement of each specimen are shown in FIGS. 18A to 18C. As shown in (a) of FIG. 18, the maximum shear strength of the lateral load of the non-seismic detailed RC ramen structure was 214.46 kN on average, and the lateral displacement was about 9 mm, about 1.0% of the interlayer displacement. In addition, the nonlinear static analysis results show the predicted shear strength and the error of only 1%, confirming the suitability of the analysis process.

18 (b) and (c) show the lateral load resistance of the RC ramen structure reinforced by the comparative brace method and the developed brace 1 method, respectively.

Both braces have been shown to improve the strength of RC ramen structures by about three times. In particular, when the brace 1 method was used, the maximum shear strength against the lateral load was 681.77 kN, which showed about 14% improvement in the lateral load resistance.

Fig. 19 shows the lateral load resistance capability-lateral displacement relationship of the non-reinforced, comparative brace reinforced method, and developed brace 1 method reinforced non-seismic detailed RC ramen structure. Note that in the case of the comparative brace method reinforcement (Fig. 18 (b)), the strength and rigidity is greatly increased, but less than half of the displacement at the maximum load of the RC ramen structure (Fig. 18 (a)) of about 4 mm It was destroyed at (interlayer displacement 0.5%). Considering that seismic loads generally lead to failure by inducing displacement in the structure, it means that failure occurs, i.e., the reinforcing effect is lost at very small displacements.

On the other hand, the RC structure applied to the brace 1 method developed this time is not only strength and stiffness for lateral load, but also 22.5 mm (interlayer displacement 2.5%) exceeding 9 mm, which is the displacement at break load of RC structures. It showed reinforcement ability. It is also about 25% more than the 544.13 kN predicted by nonlinear static analysis.

Based on the results of these experiments, the braces 2 and 3, which are the forms of tensioning and restraining the frame assembly with respect to the brace 1, although not tested, are expected to express more than the lateral resistance capability shown in the analysis results.

In addition, in the construction method of the brace assembly according to the fourth embodiment and the fifth embodiment, although the tension material 27 is used as the brace 20 and the steel rod 21 is used as the brace, the shape is somewhat different from the embodiment. Since the technical characteristics of introducing tension force, restraining frame assembly, and adding tension force to the brace are shared, it is expected that the behavior characteristics similar to those of the brace 2 (the second embodiment) and the brace 3 (the third embodiment) can be expressed. do.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

10: frame assembly 11: engraving frame
12: mortar joining bolt 13: steel sheet for joining
15 steel plate for brace connection 16 reinforcement blade
20: brace 21: steel rod
22: connecting steel 23: first tension introduction device
24: 1st mounting bracket 25: 2nd tension tension introduction device
26: curved curved steel 27: tension material
28: 2nd mounting bracket 29: rotating roller
30: third mounting bracket 31: third tension force introduction device
32: through bracket 33: tension steel
34: nut 35: spring washer
36: 4 mounting bracket 37: 5 mounting bracket
38: fourth tension force introduction device

Claims (9)

Forming a frame assembly having an outer shape smaller than an open surface of a structure to be installed;
Connecting braces to upper and lower corners of the upper and lower centers of the frame assembly, respectively;
Introducing tension into the brace; And
And filling the mortar-based material between the structure and the frame assembly to integrate the structure and the frame assembly.
In the frame assembly forming step, the first mounting bracket is installed on one end of the outer surface of the frame assembly, and the second tensioning device is installed on the outer surface of the frame assembly adjacent to the first mounting bracket.
After the tension introduction step,
Fixing one end to the first mounting bracket, and fixing the other end to the second tension-tension introducing device while surrounding the outer surface of the frame assembly to install a tension member; And
And applying a tension force to the tension member by operating the second tension force introduction device. Forming a frame assembly having an outer shape smaller than an open surface of a structure to be installed;
Connecting braces to upper and lower corners of the upper and lower centers of the frame assembly, respectively;
Introducing tension into the brace; And
And filling the mortar-based material between the structure and the frame assembly to integrate the structure and the frame assembly.
After the tension introduction step,
Installing a first mounting bracket at one end of the frame assembly and installing a second tension introducing device adjacent to the first mounting bracket;
Fixing one end to the first mounting bracket, and fixing the other end to the second tension-tension introducing device while surrounding the outer surface of the frame assembly to install a tension member; And
And applying a tension force to the tension member by operating the second tension force introduction device. Forming a frame assembly having an outer shape smaller than an open surface of a structure to be installed;
Connecting braces to upper and lower corners of the upper and lower centers of the frame assembly, respectively;
Introducing tension into the brace; And
And filling the mortar-based material between the structure and the frame assembly to integrate the structure and the frame assembly.
After the tension introduction step,
Installing a plurality of through brackets on each side of the frame assembly;
Inserting a threaded tension steel into the through-type bracket on each side of the frame assembly; And
Inserting nuts at both ends of the tension steel, respectively, and rotating the other nut while one nut is supported by the through-bracket to impart tension to the tension steel; Reinforcement brace assembly construction method. 4. The method according to any one of claims 1 to 3,
In the frame assembly forming step, further comprising the step of providing a brace connection steel plate formed with fastening holes in the upper upper and lower corners of the upper and lower corners of the frame assembly,
The brace is connected to the steel rods are formed in the opposite ends of the steel rods formed in the opposite direction, and one end is formed with a thread corresponding to one end of the steel bar and the other end is connected to the brace connecting steel plate to be rotatably connected. Including;
In the brace connecting step, the connecting steel is fastened to each end of the steel rod and the connecting steel is rotated with respect to the brace connecting steel sheet through a coupling member in the connecting hole of the connecting steel and the fastening hole of the brace connecting steel sheet. Tighten it as much as possible,
In the tension force introduction step, the seismic reinforcement brace assembly construction method characterized in that to give the steel bar a tension force by rotating in one direction to the connecting steel. The method of claim 4, wherein
The brace assembly construction method for seismic reinforcement, characterized in that the steel rod of the brace is equipped with a first tension force introduction device capable of rotating the steel rod in the intended direction. Forming a frame assembly having an outer shape smaller than an open surface of a structure to be installed;
Connecting braces to upper and lower corners of the upper and lower centers of the frame assembly, respectively;
Introducing tension into the brace; And
And filling the mortar-based material between the structure and the frame assembly to integrate the structure and the frame assembly.
In the frame assembly forming step, a second mounting bracket is installed at one end of the outer surface of the frame assembly, a rotating roller is installed at the lower center of the upper end of the frame assembly, and a third mounting bracket is installed at one of the edges of the bottom of the frame assembly. Installing, and forming a through hole in the other corner,
In the brace installation step, the tension member is secured to the second mounting bracket, and the third mounting is passed through the through hole and the third tension force introduction device is interposed through the rotating roller while surrounding the outer surface of the frame assembly. To the bracket,
In the tension force introduction step, the seismic reinforcement brace assembly construction method characterized in that to provide a tension force to the tension material by operating the third tension force introduction device. Forming a frame assembly having an outer shape smaller than an open surface of a structure to be installed;
Connecting braces to upper and lower corners of the upper and lower centers of the frame assembly, respectively;
Introducing tension into the brace; And
And filling the mortar-based material between the structure and the frame assembly to integrate the structure and the frame assembly.
In the frame assembly forming step, the rotating roller is installed in the lower center of the upper end of the frame assembly, and further comprising the step of installing the fourth and fifth mounting brackets on both upper corners of the lower end of the frame assembly,
In the brace connection step, further comprising the step of fixing the tension member to the fourth mounting bracket and the fifth mounting bracket in the state in which the fourth tensioning force introducing device via the rotating roller,
In the tension force introduction step, to provide the tension force to the tension member by operating the fourth tension force introduction device,
After the tension introduction step,
Installing a plurality of through brackets on each side of the frame assembly;
Inserting a threaded tension steel into the through-type bracket on each side of the frame assembly; And
Inserting nuts at both ends of the tension steel, respectively, and rotating the other nut while one nut is supported by the through-bracket to impart tension to the tension steel; Reinforcement brace assembly construction method. delete The method according to any one of claims 1, 2, 3, 6 and 7,
In the frame assembly forming step, the mortar bonding bolt is mounted on the outer surface, seismic reinforcement brace assembly construction method characterized in that to form a frame assembly by joining the pieces of the frame divided into a plurality of pieces.

Images