JPH1061203A - Earthquake resisting reinforcing structure of existing reinforced concrete-made earthquake resisting wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost by a method wherein an existing wall surface is reinforced with a rhombic member formed of an oblique material and a horizontal member and a vertical member disposed between corner parts positioned facing each other. SOLUTION: A reinforcing member 6 comprising a rhombic member comprised of four oblique materials and a horizontal tie material 4 and a vertical tie material 5 disposed over a portion between corner parts positioned facing each other are juxtaposed on one surface or both surfaces of an earthquake resisting wall between a column 1 and a beam 2. The reinforcing member 6 is joined with an existing earthquake resisting wall with bolts or welding, and joined with the column 1 and the beam 2 through a post-work executing anchor and joined togetherwith a peripheral reinforcing member 10. A rhombic member and the tie materials 4 and 5 form one unit, and a plurality of the units are juxtaposed and coupled together between the column 1 and the beam 2. Further, two oblique materials continued in the same direction are disposed in one continued X-shape to increase the integral property of each unit P. Since a shearing force exerted on the column 1 and the beam 2 during the occurrence of an earthquake is borne by the tie materials 4 and 5, a need for the column 1 and the beam 2 is eliminated, and a construction cost is saved, and a term of works is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reinforces an existing earthquake-resistant wall to prevent the shear-resistant wall and the columns and beams surrounding the wall from being sheared and destroyed by seismic force. The present invention relates to a seismic retrofitting structure of a reinforced concrete shear wall of an existing reinforced concrete building or an existing reinforced concrete building to improve performance.

2. Description of the Related Art Reinforced concrete buildings are generally required to carry out structural calculations at the time of design according to the Building Standards Law and the like. It has become more sophisticated with the accumulation of knowledge from experience and the great progress and development of computers and their utilization technologies. In particular, the present invention is designed to comply with the old structural calculation standards before the latest structural calculation standards of the Architectural Institute of Japan, etc. are presented and used, and seismic reinforcement of existing earthquake-resistant walls of existing reinforced concrete buildings. It is about structure.

[0003]

2. Description of the Related Art As a conventional example of a seismic retrofitting structure of an existing reinforced concrete structure, for example, a document "Handbook for Seismic Retrofitting of an Existing Reinforced Concrete Structure" is introduced. (A) to (e) are shown. According to this example, vertical and horizontal reinforcing bars q are arranged on one entire surface of the existing reinforced concrete earthquake-resistant wall p and fixed to the columns s and the beams t via the engraved anchors r and the like, and then a predetermined thickness is applied to the same portions. The concrete is increased and the seismic strengthening wall p 'is constructed. In the figure, u is a split reinforcing bar composed of a spiral bar or the like, and v is a shear connector.

[0004]

However, in the above-mentioned prior art, the work for arranging the reinforcing bars in the vertical and horizontal reinforcing bars of the reinforced concrete portion and the attachment of the anchoring bars and the like for joining the reinforcing bars to the columns, beams and walls of the existing portion. Work, roughing work of the wall to make the additional concrete wall and the existing concrete earthquake-resistant wall integrally resist the shear force at the time of the earthquake, and work of attaching the shear connector provided on the contact surface of both walls,
Work such as formwork installation work on the additional concrete wall, concrete casting work of the same part, grouting work into the gap created at the top of the additional concrete wall, dismantling of the formwork after the required strength of the additional concrete is developed, unloading work, etc. A great deal of labor and time was required for the reinforcement work.

[0005] In addition, when the shearing strength of the earthquake-resistant wall is increased by the above-mentioned reinforcing work and the stress distribution of the entire frame is changed, it may be necessary to reinforce columns and beams surrounding the earthquake-resistant wall. Requires more labor and time. Furthermore, the wall thickness is increased due to the wall reinforcement, so that the effective space of the building is reduced, and the weight of the building is increased by the additional concrete.

As described above, there are many problems in the prior art, such as the availability of the building during the period related to the reinforcement work and the cost of the reinforcement work. An object of the present invention is to provide an earthquake-resistant reinforcement structure for an existing reinforced concrete earthquake-resistant wall, which can reduce the cost and shorten the construction period of the existing earthquake-resistant wall.

[0007]

In order to achieve the above object, according to the seismic retrofit structure of the existing reinforced concrete earthquake-resistant wall according to the present invention, four reinforced concrete earthquake-resistant walls are provided on one or both sides of the existing reinforced concrete earthquake-resistant wall. A rhombus member made of a diagonal member and a reinforcing member composed of a horizontal connecting member and a vertical connecting member arranged between opposing corners of the rhombic member are provided side by side.

According to a second aspect of the present invention, a rhombic reinforcing member in which the rhombic member and the opposite corners of the rhombic member are connected by a horizontal connecting member and a vertical connecting member is defined as one unit, and the rhombic member is provided in a plurality in the horizontal direction. It is configured in parallel. According to the invention of claim 3, two or more rhombic reinforcing members arranged in the horizontal direction which are continuous in the same direction at the central portion.
The diagonal members are formed in one continuous X shape.

According to the fourth aspect of the present invention, two diagonal members, horizontal members, or vertical members which oppose each other across the same wall of the two sets of the reinforcing members disposed on both surfaces of the existing wall penetrate the wall. They are fixed to each other by bolts. Claim 5
According to the invention, a required number of anchor bolts are buried and fixed in the vicinity of the mounting position of each end of the reinforcing member of the left and right columns and the upper and lower beams surrounding the existing reinforced concrete earthquake-resistant wall, and the earthquake-resistant wall is inserted through the anchor bolt. Are attached to the columns and beams, respectively, and the reinforcing members are attached to predetermined positions of the columns and beams by welding or bolting through the peripheral reinforcing steel bars.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 1 and 2 denote columns and beams of an existing reinforced concrete structure.
A diamond-shaped member 3 made of four diagonal members on one or both sides of an earthquake-resistant wall formed between the pillar 1 and the beam 2 in the column-beam space, and an opposing corner of the diamond-shaped member 3. A reinforcing member 6 constituted by a horizontal connecting member 4 and a vertical connecting member 5 arranged in parallel is provided.

The reinforcing member 6 is joined to an existing reinforced concrete existing earthquake-resistant wall 7 by bolts 8 or welding w, and is also joined to the columns 1 and the beams 2 via post-installed anchors 9. Reference numeral 10 denotes a peripheral reinforcing member, and the reinforcing member 6 is joined to the column 1 and the beam 2 together with the peripheral reinforcing member 10. (Figure 1
3 and FIG. 5) The rhombus member 3 and the horizontal connecting member 4 and the vertical connecting member 5
Forms one unit P, and the unit P is a pillar 1 and a beam 2
Are connected side by side.

The two diagonal members 6 which are continuous in the same direction among the plurality of units P arranged side by side in the horizontal direction are formed in one continuous X shape, thereby increasing the unity of each unit. I do. A part or the whole of the reinforcing member 6 may be made of a piano wire, or an FRP material whose tensile strength is reinforced by steel fiber, glass fiber, or carbon fiber.

FIG. 6 shows the distribution of shear forces in the columns 1 and 2 when a horizontal force H is applied to the existing reinforced concrete shear wall A. FIG. The shear force distribution diagram of the column 1 and the beam 2 in the case where it performed is shown, and the distribution of the shear force of the column 1 and the beam 2 increases with the increase in weight due to the overstrike. According to the invention, the pillar 1,
As shown in the case where the reinforcing member 6 is disposed between the beams 2, the resistance of each member of the reinforcing member 6 prevents an increase in stress of the surrounding columns 1 and beams 2.

[0014]

According to the present invention, as described above, the diamond member consisting of four diagonal members and the horizontal and vertical connecting members disposed between the opposite corners of the diamond member are previously formed. Since the reinforcement members are simply manufactured and attached to existing columns and beams via a small number of anchors and peripheral reinforcements and fixed, the existing earthquake-resistant walls can be reinforced in a short period of time and economically. Things.

When the conventional reinforcing method is adopted, after shear cracks occur in the shear-resistant wall, the shear stress of the columns and beams surrounding the shear-resistant wall before the reinforcement is increased due to the change in the stress state. A phenomenon that increases in comparison with the shear force distribution occurs. For this reason, in some cases, it is necessary to reinforce not only the earthquake-resistant wall portion originally intended for reinforcement, but also the columns and beams surrounding the earthquake-resistant wall. However, according to the present invention, in addition to the diagonal members forming the rhombic member, the reinforcing member is provided with the horizontal connecting member and the vertical connecting member connecting the opposing corners of the rhombic member. Due to horizontal force such as time
Each of the connecting members bears and resists a part of the shearing force acting on the column / beam through the force which should be generated in the diagonal member of the reinforcing member, and therefore, the increase of the shearing stress acting on the column / beam. Can be prevented. As a result, an increase in shear stress acting on the columns and beams can be prevented. Therefore, it is not necessary to reinforce the shear strength of the columns and beams, so that the construction cost can be reduced and the construction period can be shortened.

Further, according to the present invention, since the increase in wall thickness for reinforcing the earthquake-resistant wall is small, there is no need to change the plane plan, and the increase in the weight of the building is small. Claim 2
According to the invention, the rhombic member and the rhombic reinforcing member connecting between the opposite corners of the rhombic member are made into one unit, and a plurality of the units are arranged side by side in the horizontal direction, whereby the required reinforcement by the reinforcing member is achieved. The effect can be exhibited.

According to the third aspect of the present invention, two of the rhombic reinforcing members provided side by side in the horizontal direction, two diagonal members that are continuous in the same direction at the center are formed into one continuous X shape. Thereby, the reinforcing members are integrated with each other to enhance the reinforcing effect. The invention according to claim 4 is a simple and easy work for attaching the reinforcing member to the existing wall by mutually tightening the diagonal members, horizontal members, or vertical members facing each other with the existing wall of the reinforcing member interposed therebetween by through bolts. It can be performed efficiently.

According to a fifth aspect of the present invention, a required number of anchor bolts are buried and fixed in the columns and beams surrounding the existing reinforced concrete earthquake-resistant wall in the vicinity of the mounting positions of the respective reinforcing members.
Attached to the pillars and beams, respectively, the reinforcing steel members for the peripheral wall of the earthquake-resistant wall via the anchor bolts, and welded and bolted the reinforcing members through the peripheral reinforcing steel members to the columns and beams at a predetermined position. The peripheral reinforcing shaped steel can be used for both peripheral reinforcement and for attaching a reinforcing material.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an existing reinforced concrete earthquake-resistant reinforcing structure of a reinforced concrete shear wall according to the present invention.

FIG. 2 is a front view showing another embodiment of the earthquake-resistant reinforcement structure according to the present invention.

FIG. 3 is a front view showing still another embodiment of the earthquake-resistant reinforcement structure according to the present invention.

FIG. 4 is a side view of the seismic retrofit structure according to the present invention.

FIG. 5 is a front view showing a joint between an earthquake-resistant reinforcing member and an existing column.

Fig. 6 (a) (b) is a distribution diagram of the shearing force of the surrounding columns and beams generated from the reaction force after the shear crack due to the horizontal force of the shear wall, (a) is the existing shear wall, (b) is the existing earthquake resistance This shows the case where the wall is overstrike.

FIG. 7 is a shear distribution diagram of columns / beams when a horizontal force acts on an earthquake-resistant wall using the reinforcing member of the present invention.

8 (a), (b) and (c) are a front view, a plan view, and a vertical cross-sectional view, respectively, in which a part of an example of a conventional structure is omitted.
(E) is a longitudinal sectional side view and a partial longitudinal sectional front view showing another example of the conventional structure.

[Explanation of symbols]

 A Existing earthquake-resistant wall P unit w Weld 1 Column 2 Beam 3 Diamond member 4 Horizontal joint 5 Vertical joint 6 Reinforcement member 7 Existing earthquake-resistant wall 8 Bolt 9 Post-installed anchor 10 Peripheral reinforcement

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location E04B 2/56 651 E04B 2/56 651S 652 652H 652M E04H 9/02 E04H 9/02

Claims (5)

[Claims] 1. A rhombic member made of four diagonal members on one or both sides of an existing reinforced concrete earthquake-resistant wall, a horizontal connecting member disposed between opposing corners of the rhombic member, and A seismic retrofit structure for an existing reinforced concrete shear wall, comprising a reinforcing member composed of a vertical connecting member. 2. A rhombic reinforcing member having a rhombic member and a rhombic reinforcing member connected between opposing corners of the rhombic member by a horizontal connecting member and a vertical connecting member is defined as one unit, and a plurality of the units are arranged in a horizontal direction. Item 2. An earthquake-resistant reinforcement structure for an existing reinforced concrete shear wall according to Item 1. 3. A plurality of rhombic reinforcing members arranged side by side in the horizontal direction which are continuous in the same direction at a central portion.
The seismic retrofit structure of an existing reinforced concrete shear wall according to claim 2, wherein the diagonal members are formed in one continuous X shape. 4. A diagonal member, a horizontal member, or a vertical member facing each other across the same wall of two sets of the reinforcing members disposed on both surfaces of an existing wall, and the reinforcing members are mutually fastened to the wall by through bolts. The seismic retrofitting method for an existing reinforced concrete shear wall according to claim 1, wherein the seismic retrofitting is performed. 5. A required number of anchor bolts are buried and fixed in the vicinity of the mounting position of each of the reinforcing members on the left and right columns and the upper and lower beams surrounding the existing reinforced concrete earthquake-resistant wall, and the earthquake-resistant wall is connected via the anchor bolt. 2. An existing reinforced concrete structure according to claim 1, wherein said peripheral reinforcing steel is attached to each of said columns and beams, and said reinforcing member is attached to a predetermined position of said columns and beams by welding or bolting through said peripheral reinforcing shaped steel. Earthquake-resistant reinforcement structure for earthquake-resistant walls.