TWI527954B - Structure for promoting seismic resistance of building - Google Patents

Description

Seismic reinforcing structure

The present invention relates to a seismic strengthening structure, and more particularly to a reinforced concrete (RC) structure or a steel reinforced concrete (SRC) structure for a seismic strengthening structure on the outer surface of a multi-storey existing building. .

A reinforced concrete structure (hereinafter referred to as an RC structure) or a steel frame reinforced concrete structure (hereinafter referred to as an SRC structure) is applied, for example, to a multi-story building as shown in FIG. It is needless to say that the column and the beam are indispensable in the structure, and a spandrel wall is provided in the frame 33 formed on the outer wall side by the column 31 and the beam 32 on the outer wall side. Sagging wall, door, window (omitted in the figure), etc. The column supports the load of the upper layer, and the beam is integrated with the slab 34 of each layer.

If such a building receives a large lateral force due to an earthquake or the like, the upper beam in the frame is displaced in the left-right direction with respect to the lower beam, and the left and right columns are inclined in the same direction. Therefore, the frame becomes a parallelogram. The beam is reversely deflected due to the back-shake, and becomes a parallelogram that the column is inclined in the opposite direction. The deformation of this structure is repeated for a certain period of time.

In addition, when the surface of the existing building such as the RC structure is subjected to seismic reinforcement, when it is required to perform construction without causing the residents to exit the building or when it is required to not narrow the field of view of the window, apply Japan. Recorded in Patent Special Open 2004-169504 Brac-less construction method. That is, the reinforcing column is integrated with the existing column (also referred to as an RC column), and the reinforcing beam is integrated with the existing beam (also referred to as an RC beam), and the reinforcing column and the reinforcing beam form a further structure.

On the other hand, Japanese Patent Laid-Open No. 2007-138472 proposes a seismic strengthening construction method in which a reinforcing column and an RC column are integrated, but the reinforcing beam and the RC beam are not integrated. The reason for not integrating the reinforcing beam with the existing beam is not clear. The reason for this is that the column that is reinforced by the integration of the reinforcing column and the existing column improves the earthquake resistance of the building. Therefore, even if the reinforcing beam is not integrated with the existing beam, the new structure formed by the reinforcing column and the existing beam is maintained. There is no problem when it is stable.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2004-169504 JP2004-169504 A1

[Patent Document 2] Japanese Patent Laid-Open No. 2007-138472 JP2007-138472 A1

As described in Patent Document 2, in order to integrate the reinforcing column and the existing column and to perform surface bonding by an anchor bolt or the like, the steel frame reinforcing column can withstand the existing one. The RC column is more deformed. On the other hand, there is a force that is hardened by the deformation of the steel frame column acting on the RC column, and the anchor bolt induces a problem that the concrete of the existing column is cracked. Although the details are omitted, such a problem can be solved by the technique of Patent Document 1 which realizes the approximation of the flexural rigidity of the existing column and the reinforcing column.

In addition, in buildings where the old earthquake resistance standard must be applied to earthquake resistance, Even if the existing beam itself has low earthquake resistance, the existing beam is more integrated with the floor (slab), so the earthquake resistance of the existing beam is still higher than that of the existing column. This means that the shock resistance of the existing column is more indispensable than the reinforcement of the existing beam.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a seismic-resistant reinforcing structure which focuses on the reinforcement of the outer surface of a structure such as RC, and focuses on the difference in the earthquake resistance between the existing column and the existing beam. And the reinforcing column does not cause cracks in the existing column to improve the seismic resistance of the column of the building.

The present invention is applied to an earthquake-resistant reinforcing structure of an outer surface of a multi-storey building having an RC structure or an SRC structure, and is characterized in that, with reference to Fig. 1, on the outer side of the existing column 2 on the outer wall side of the building in the existing building At the site, the reinforcing column 8 is erected in a facing manner without being fixed to the existing column. The lower part of the reinforcing column 8 is connected to the upper part of the reinforcing beam 9L which is fixed to the existing beam 1L integrated with the slab 5L, and the upper part of the reinforcing column 8 is fixed to the upper part of the upper floor (slab) 5U. The existing beam 1U is connected to the lower portion of the reinforcing beam 9U, and the reinforcing beam 9U is connected to the lower portion of the upper portion of the reinforcing column 8 at the upper portion. Further, the reinforcing beams 9 fixed to the same existing beams are arranged such that the reinforcing beams adjacent to the left and right are not continuous with each other.

For example, as shown in FIG. 1 or FIG. 5, the reinforcing column or the reinforcing beam system is made of steel. In this case, as shown in FIG. 6, the vibration absorbing mechanism 23 capable of absorbing energy by the deformation of the steel plate made of steel at a very low drop point can be interposed in the reinforcing column 8. Further, the concrete 13 may be filled in a space surrounded by the reinforcing column 8 and the web and the flange of the reinforcing beam 9.

Instead of the steel, as shown in FIG. 8, the reinforcing column and the reinforcing beam are RC structural reinforcing columns 28 and RC structural reinforcing beams 29.

According to the present invention, the reinforcing column is erected on the reinforcing beam fixed to the existing beam on the upper and lower sides, but is not integrated with the existing column, so even if the external force acts, the deformation of the reinforcing column is different from the deformation of the existing column, and the existing column is hardly Influenced by the deformation of the reinforcing column. That is, although the existing portion between the existing column and the reinforcing column is small, a space remains, and the existing column is released from the deformation of the following reinforcing column, and the generation of the crack of the existing column is suppressed as much as possible. Since the reinforcing column is supported by the existing beam with high vibration resistance by the reinforcing beam, the reinforcing column does not fall off, and the stability of the I-type reinforcing frame structure using the reinforcing column and the reinforcing beam is maintained.

By fixing the reinforcing beam fixed to the existing beam to the reinforcing beam adjacent to the left and right, the horizontal length of the reinforcing beam leaves a sufficient length for supporting the reinforcing column. Not only the amount of work required to fix the reinforcing beam to the existing beam but also the amount of the input material is suppressed, thereby shortening the construction period.

When the reinforcing column and the reinforcing beam are made of a profiled steel, the on-site assembly work for the introduction of the processed products of the factory is greatly reduced compared with the reinforcement of the concrete structure. The installation working space of the vibration-damping mechanism of the steel plate made of steel with extremely low drop point can be ensured in the opposite part of the existing column and the reinforcing column, and the ability to improve the energy absorption effect in a large earthquake can be improved.

If the concrete is filled in the space surrounded by the web and the flange of the reinforcing column or the reinforcing beam, the flexural rigidity of the reinforcing column and the reinforcing beam can be enhanced, as long as the welding is appropriately selected. The specification of the section steel and the amount of concrete filled can achieve the required flexural rigidity.

If the reinforcing beam and the reinforcing column are set to the RC structure, the reinforcing beam can also be enlarged in the building in which the outer surface of the existing column protrudes more outward than the outer surface of the existing beam or the surface has irregularities on the outer surface. The degree of freedom in the shape of the formation.

1, 1L, 1U‧‧‧ Existing beams

2, 2L, 2U‧‧‧ existing columns

3‧‧‧RC structure or SRC structure multi-storey existing buildings (buildings)

4, 33‧‧‧ framework

5, 5L, 5U, 34‧‧‧ floors

6‧‧‧I type reinforcement framework

7‧‧‧ Space

8, 8L, 8R‧‧‧ reinforcing column

9, 9L, 9U‧‧‧ reinforcing beam

10‧‧‧Steel

11‧‧‧Welded H-beam

12‧‧‧ reinforcing framework

13, 14‧‧‧ concrete

21‧‧‧Flange

22‧‧‧ web

23‧‧‧ Vibration Mechanism

23a‧‧‧seismic steel plate

24‧‧‧ pads

25‧‧‧Reinforcing plate for up and down direction

26‧‧‧Incision

28‧‧‧RC structural reinforcement column

29‧‧‧RC structural reinforcement beam

31‧‧‧ column

32‧‧‧ beams

Fig. 1 (a) and (b) are views showing an example of the seismic-resistant reinforcing structure of the present invention, and a cross-sectional view and a front view of a main portion in the case of using a reinforcing column made of a flat grooved steel and a reinforcing beam, the front view The view is equivalent to the AA line arrow. 1(c) is a cross-sectional view taken along line B-B.

Fig. 2 is an external view showing the earthquake-resistant reinforcement of the I-type reinforcing frame structure based on the configuration of Fig. 1 on the outer surface of the multilayer existing RC structure.

Fig. 3 (a) and (b) are sectional views and the front part of the main part of the case where the shape or size of the reinforcing column or the reinforcing beam is different from the shape or size of the existing column or the existing beam. view. 3(c) is a cross-sectional view taken along line C-C.

Fig. 4 (a) and (b) are a cross-sectional view and a front view of a main portion in the case of welding a reinforcing column made of H-shaped steel and a reinforcing beam. 4(c) is a cross-sectional view taken along the line D-D.

FIGS. 5(a) and 5(b) are external views of the case where the vibration-resistant reinforcing structure based on the configuration of FIG. 4 is applied to the multi-layer existing RC structure, and the vibration damping mechanism is introduced into the reinforcing column.

Fig. 6 (a) to (c) are perspective views for explaining a configuration example of a vibration damping mechanism that performs energy absorption by deformation of a steel plate made of a very low drop point of a reinforcing column.

Figure 7 (a) to (c) are a cross-sectional view, a front view and a plan view of a main part of an example of a welded steel reinforcing column and a reinforcing beam applied to a building in which one of the existing columns protrudes further outward than the existing beam. .

Fig. 8 (a) and (b) are a cross-sectional view and a front view of a main portion when the reinforcing column or the reinforcing beam is set to the RC structure. 8(c) is a cross-sectional view taken along the line E-E.

Fig. 9 is a view showing an appearance of a reinforcing column and a reinforcing beam of an RC structure applied to a building in which one of the existing columns protrudes further outward than the existing beam.

Fig. 10 is an external view showing a case where an RC structural reinforcing column and a reinforcing beam are applied to a building in which the outer surface of the existing column and the outer surface of the existing beam are on the same imaginary surface.

Fig. 11 is an external perspective view showing an RC structure or an SRC structure multi-storey existing building in which an existing column and an existing beam on the outer wall side of the building, a frame formed by the same, and a slab are described.

Hereinafter, the seismic-resistant reinforcing structure of the present invention will be described in detail based on the drawings. The building to which the present invention is applied is an RC structure or SRC structure as described in Fig. 11 to construct a multi-layer existing building. Each of the examples in which the positions of the outer surfaces of the existing columns and the existing beams on the outer wall side are different from each other will be described. In the same manner as in Fig. 11, Fig. 2 is a building 3 in which the existing beam 1 protrudes outward (front) from the existing column 2 (refer to the left upper portion toward the outer side of the external view). Needless to say, the two existing beams 1 facing up and down and the two existing columns 2 facing each other form a frame 4 which forms a part of the house or a surface outside the room.

The existing beam 1 is integrated with the slab 5, and its connection portion cannot be seen, but the slab 5 is expanded in the house. The existing column 2 supports the existing beam 1 integrated with the slab 5, and the load acting on the existing column is transmitted to the existing column 2 downstairs and reaches the foundation. The following configuration is implemented as the seismic reinforcement of such a building. Fig. 1 is a cross-sectional view showing the main part of the case of the earthquake-resistant reinforcement, and is a main part of the case where the I-type reinforcing frame 6 made of welded flat groove steel is attached to the right side, the left side or both sides of the rectangular frame 4 of the existing building. And front view.

As will be described in detail, the reinforcing column 8 is disposed so as to face the space between the existing column and the existing column 2 on the outer wall side of the existing building. As shown in Fig. 1(a), the existing beam 1L integrated with the floor slab 5L is fixed with a reinforcing beam 9L, and the existing beam 1U integrated with the upper floor slab 5U is fixed with a reinforcing beam 9U. . The reinforcing column 8 is integrated with the upper and lower reinforcing beams in a state in which the reinforcing beam 9L and the reinforcing beam 9U are sandwiched, and the reinforcing frame 6 is formed. As shown in Fig. 1(b), the reinforcing beam 9 is set to be much shorter than the existing beam 1, and is fixed to the reinforcement of the existing beam 1L. The beam 9L is discontinuous with the reinforcing beams adjacent to the left and right, and the reinforcing beam 9U fixed to the existing beam 1U is also discontinuous with the reinforcing beams adjacent to the left and right.

Although the reinforcing column 8 and the reinforcing beam 9 are made of steel, as shown in FIG. 1( a ), the cross-sectional shape is, for example, U-shaped. It may also be a ready-made grooved steel. In the case of a ready-made product of a size that is not suitable for reinforcement, it may be a welded steel product obtained by welding a steel plate cut to a desired size. A profile 10 having a smaller cross-sectional area is depicted in FIG. Thus, the size or shape of the groove can be selected as desired. In short, since it is a cutting operation or a plate working in a factory, the production precision is high. Of course, only the welded H-beam 11 may be used as shown in Fig. 4, or the reinforcing frame 12 including the welded flat groove steel and the welded H-shaped steel may be used as shown in Fig. 7 below.

If the reinforcing column and the reinforcing beam are made of welded flat steel such as welded flat groove steel or welded H-shaped steel or a commercially available steel, it is more labor-saving than the reinforcement of the concrete structure to realize the on-site assembly engineering of the processed products. Chemical. Whether the section steel is a welded product (a product that is out of specification) or a commercially available specification, when used as a reinforcing column, it is in a space surrounded by a web or a flange or by a template ( The concrete 13 is filled as needed in the enclosed space such as not shown (for example, see FIG. 1(b)). Thereby, it is easy to enhance the flexural rigidity of the reinforcing column, and as long as the specification of the steel and the amount of the filled concrete are appropriately selected, the required flexural rigidity can be obtained.

Incidentally, in the space surrounded by the reinforcing beam 9 and the existing beam 1, the concrete 14 is filled as shown in Fig. 1 (a), and an anchor (not shown) or the like is implanted to realize the reinforcing beam. Solid integration with existing beams. The reinforcing beam made of steel can be easily integrated with the existing beam by using a known means such as an anchor or a prestressing steel bar (PC). In addition, the reinforcing column can be assembled into the reinforcing beam in advance in the workshop to produce the above-mentioned I-shaped or T-shaped reinforcing structure, and the lower structure and the upper structure are used in the field engineering. Welding or bolting on to form a reinforcement of the desired height. If the reinforcing beam is shortened, the handling-ability is improved and the progress of the project is promoted.

Further, as described above with reference to FIG. 1(a), at the outer side portion of the existing column 2, the reinforcing column 8 is disposed to face the space 7 apart from the existing column. The "separated space" means that the two columns are not fixed to each other, and the intention is to prevent the load between the existing column and the reinforcing column. Therefore, it is assumed that the existing column and the reinforcing column are as close as possible, and even if it is an extremely narrow space in which the gap cannot be recognized in appearance, the effect of the present invention can be exerted as long as there is no physical state of the existing column and the reinforcing column.

Further, when there is a space between the existing column and the reinforcing column, even if the space is implemented as an additional engineering bridge, if the weight of the existing column is maintained, the weight of the existing column and the weight of the reinforcing column are conveyed. The state is within the scope of the invention. Incidentally, when there is no gap or only a slight appearance, if the present invention causes the lateral force to act in a direction perpendicular to the frame as the object, that is, if the force acts from the front side (outside) or the back of the existing column, It allows the existing column and the reinforcing column to rely on each other. In this way, the collapse of the building in the front and rear direction of the building during the earthquake is suppressed.

Fig. 4 is an example of a building applied to a building in which the outer surface of the existing beam 1 is on the same imaginary surface as the outer surface of the existing column 2. The thickness of the reinforcing column 8 is smaller than the thickness of the reinforcing beam 9, thereby securing the space 7. In the example of Fig. 7, in order to secure the space 7, the reinforcing column 8 is placed as far as possible on the outside. In the case of the former, the appearance is as shown in Fig. 5(a), but the web of the reinforcing column 8 may be interposed in the vibration damping mechanism as shown in Fig. 5(b). The vibration damping mechanism absorbs energy by deformation of a steel plate made of a steel having a very low drop point. Needless to say, the existence of the relative space between the existing column and the reinforcing column provides a mounting space or a plastic deformation allowable space for the reinforcing column such as the vibration damping mechanism. If the vibration damping mechanism is installed, the energy absorption effect during a major earthquake can be greatly exerted.

The details of an example of the vibration damping mechanism 23 are shown in Fig. 6 (exaggeratedly depicted), and the web is shown in Fig. 6(a) when the flange 21 of the near side is broken. The middle portion of 22 is defective, and a shock-absorbing steel plate 23a made of steel having a very low drop point is embedded in the defect position. As shown in Fig. 6(b), a plurality of cauls 24 mounted on the front and back sides of the web and a reinforcing plate 25 in the upper and lower directions as shown in Fig. 6(c) are provided so as not to interfere with the seismogenic steel plate 23a. The larger variants are supported in a way.

Fig. 7 is a cross-sectional view and a front view, respectively, of an essential part of an example of a welded steel reinforcing column and a reinforcing beam applied to a building in which the outer surface of the existing column 2 is more outward than the existing beam 1. In this case, the slit 26 is provided in the reinforcing beam 9 made of welded H-shaped steel. As shown in Fig. 7(c), the center of the planar shape of the reinforcing beam accommodates the front surface of the existing column 2. Further, as shown in FIG. 8, the RC structure reinforcing column 28 and the RC structure reinforcing beam 29 may be used. These toughness is inferior to that of welded steel, but in the case where the outer surface of the existing column 2 is more outward than the outer surface of the existing beam 1 (see Figs. 7 and 9), the reinforcing beam is formed. The range of shape selection is expanded.

As described in detail above, the reinforcing column is erected on the reinforcing beam fixed to the existing beam on the upper and lower sides, but is not integrated with the existing column. Therefore, even if the deformation of the reinforcing column is different from the deformation of the existing column, the existing column is rarely affected by the reinforcing column. That is, even if the reinforcing column is deformed, the existing column is prevented from being deformed by the existence of the relative space, so that the generation of the crack of the existing column is suppressed as much as possible. Since the reinforcing column is supported by the existing beam with high vibration resistance through the reinforcing beam, the reinforcing column does not fall off, and the stability of the frame structure using the reinforcing column and the reinforcing beam is maintained.

By making the reinforcing beam fixed to the existing beam a discontinuity with the reinforcing beams adjacent to the left and right, the horizontal length of the reinforcing beam can be left to a sufficient extent to support the reinforcing column. Compared with the case where the reinforcing beam is continuously fixed to the existing beam, not only The amount of work required to fix the beam to the existing beam and the amount of input material are also significantly suppressed, thereby shortening the construction period. If the reinforcing beam is continuous, the beam is reinforced, which in turn will result in a decrease in the relative strength of the column to be reinforced relative to the beam, and this problem can also be avoided.

In any of the examples, the reinforcement is described as the entire surface of the building, but the reinforcement may be applied to the intermediate layer or only the intermediate layer or only the left half of the outer surface. If so, it becomes a repetitive process of each layer unit, so that local reinforcement can be performed and the decentralization of the project can be realized. The discontinuous arrangement of the reinforcing beams on the existing beams means that the loads do not substantially affect each other, but the lengths of the reinforcing beams arranged at intervals are also allowed to be different, or the right side of the reinforcing beam is bounded by the reinforcing columns. Different lengths. A lightweight structure or a decorative structure such as a decorative structure may also be implemented between the reinforcing beams for additional purposes.

1, 1L, 1U‧‧‧ Existing beams

2‧‧‧Existing columns

4‧‧‧Architecture

5, 5L, 5U‧‧‧ floors

6‧‧‧I type reinforcement framework

7‧‧‧ Space

8‧‧‧Strengthen column

9, 9L, 9U‧‧‧ reinforcing beam

13, 14‧‧‧ concrete

21‧‧‧Flange

22‧‧‧ web

Claims (5)

A seismic-resistant reinforcing structure, which is a reinforced concrete (RC) structure or a steel frame reinforced concrete (SRC) structure for a seismic strengthening structure on the outer surface of a multi-storey existing building; characterized by: an existing column on the outer wall side of the existing building in the existing building The outer part of the reinforcing column is erected to the existing column so as not to be fixed to the existing column; the lower part of the reinforcing column is connected to the reinforcing beam fixed to the existing beam integrated with the slab The upper part of the reinforcing column is fixed to the existing beam integrated with the upper slab and connected to the lower part of the reinforcing beam, the reinforcing beam is connected to the lower part of the upper reinforcing column, and is fixed to the upper part. The reinforcing beam of the same existing beam and the reinforcing beam adjacent to the left and right are not continuous with each other. For example, the seismic strengthening structure of claim 1 is characterized in that the reinforcing column and the reinforcing beam are made of steel. For example, in the above-mentioned reinforcing column, there is a vibration damping mechanism for energy absorption by deformation of a steel plate made of a steel material having a very low drop point. The seismic strengthening structure according to claim 2, wherein the space surrounded by the web and the flange of the reinforcing column or the reinforcing beam is filled with concrete. For example, the seismic strengthening structure of claim 1 is characterized in that the reinforcing beam and the reinforcing column are reinforced concrete (RC) structures.