JPH10159352A - Aseismatic reinforcing wall body and reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange an aseismatic wall body between both upper and lower slabs of a building by connecting both upper and lower wall parts to each other by a connecting part, fixing plate parts continuing with the respective wall parts to the respective slabs, and constituting the connecting part of a member having brittleness, elastic plasticity or viscoelasticity. SOLUTION: A wall body 11 is fixed to both upper and lower slabs 10 and 10 through upper and lower plate parts 16 arranged on the wall body 11. In this case, a connecting part 14 is provided between both wall parts 12 and 12 of the wall body 11, and the connecting part 14 has brittleness, elastic plasticity, viscoelasticity or the like, and the wall body 11 fixed to the slabs 10 swings a building in the horizontal direction by an earthquake. In that case, a part of seismic force is spent on disruption and deformation of the connecting part 14 by swinging, and the seismic force is relieved. Therefore, it is formed as a longer one small in a width dimension of the wall body 11 or a large one in a width dimension according to its necessity, and plural wall bodies 11 are arranged according to its necessity. Therefore, the wall body 11 is divided into two parts, and transport work in a using existing building is facilitated, and the wall parts 12 are reduced in weight more than the whole wall body 11, and assembling and installing work can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing reinforced concrete structure, a steel frame reinforced concrete structure, a steel frame structure and the like for a seismic reinforcement wall and a reinforcing structure.

[0002]

2. Description of the Related Art Conventionally, for seismic reinforcement of an existing reinforced concrete building, a wall is installed in a space or opening defined by a pair of columns facing each other and a pair of upper and lower beams connected to both columns. Proposed. The wall is made of precast concrete, and is fixed to each beam via one or more iron plates. According to the reinforcing structure including the wall, when the building is subjected to seismic force and the beam is displaced in the horizontal direction, the iron plate connecting the beam and the wall undergoes plastic deformation, whereby Part of the seismic force is absorbed, and the seismic force is reduced.

[0003]

However, depending on the structure of the building, the manner of use of the building, and the like, it is difficult to install the wall in the space defined by the columns and beams, or it is difficult to install the wall as in daylight. There is a case where the installation is not preferable from the viewpoint of securing a comfortable habitability. An object of the present invention is to provide an earthquake-resistant wall that can be installed between both upper and lower slabs of a building in consideration of such a case. Also,
Another object of the present invention is to provide a seismic retrofit structure applied to both upper and lower slabs of a building.

[0004]

According to the present invention, a structure for seismic reinforcement of an existing building according to the present invention includes a wall, wherein the wall comprises:
It comprises upper and lower walls made of precast concrete, a connecting part between the two walls for connecting the two walls, and a plate connected to each wall and fixed to each slab. The connection has brittleness, elastoplasticity or viscoelasticity. The brittle connecting portion is composed of, for example, a mortar and a plurality of reinforcing bars embedded in the mortar and extending from the both wall portions toward each other, and further has an elastic-plastic connecting portion and a viscoelastic Are made of, for example, an iron plate and high-attenuation rubber, respectively.

[0005]

According to the present invention, the wall can be fixed to both upper and lower slabs via upper and lower plate portions provided on the wall. The wall has these connecting portions between the upper and lower walls, and since the connecting portion has brittleness, elasto-plasticity or viscoelasticity, the wall fixed to both slabs has the said When the building sways laterally, part of the seismic force is spent on the destruction, plastic deformation or deformation of the connection, which mitigates the seismic force. Further, according to the present invention, the wall is composed of two elements, and it is easy to carry them into an existing building and move them in the building.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an existing reinforced concrete building is installed between upper and lower slabs 10 of the reinforced concrete building, that is, between a ceiling and a floor on any floor of the building. The wall forming part of the structure is indicated generally by the reference numeral 11. The present invention is applicable to steel-framed reinforced concrete buildings, steel-frame buildings, and the like, in addition to the illustrated reinforced concrete buildings.

As shown in FIG. 1 and FIG.
Have a height dimension substantially equal to the distance between the upper and lower slabs 10, and have both walls 12 facing each other at a distance from each other.
And a connecting portion 14 between the two wall portions 12 for connecting the two wall portions 12 to each other, and a pair of plate portions 16 respectively connected to the both wall portions 12.

Each wall 12 is made of a precast concrete plate preformed from concrete such as ordinary concrete, lightweight concrete, ultra-lightweight concrete, or fiber concrete. The precast concrete plate is reinforced by a reinforcing bar, a wire mesh, or the like.

The connecting portion 14 has brittleness, elasto-plasticity or viscoelasticity. The connecting portion 14 may be located at a position substantially above the center of the wall body 10 in the vertical direction (see FIG. 3), or may be located above the center (see FIG. 3) or below the center (not shown). It may be.

The illustrated connecting portion 14 fills a space between the upper and lower walls 12 and has a solid mortar 18 having a plate shape as a whole, and a lower end surface of the upper wall 12 and a lower wall 12.
And a plurality of rebars 20 protruding from the upper end surface of the mortar toward one of the other, and buried in the solidified material 18 of the mortar. The solidified mortar 18 has brittleness, and when an earthquake occurs, both walls 12 are in opposite directions (FIG. 1).
When a horizontal force (see an arrow) of a predetermined magnitude is applied to the crusher (see the arrow in FIG. 2), the crusher breaks. The seismic force is reduced by the destruction of the solidified mortar 18. More specifically, the solidified mortar 18 has a flexural strength less than the flexural strength of the slab 10. Therefore, the mortar solidified material 18 is broken before the slab 10 undergoes bending fracture.

The wall body 11 carries each wall section 12 provided with the plate section 16 into the building, and connects each wall section 12 to each slab 10.
After fixing, a mold (not shown) that defines a space between the upper and lower walls 12 is installed, and then the mortar is filled in the mold to be installed.

As shown in FIG. 4, the connecting portion 14 may have elasticity and plasticity. The connecting portion 14 includes a plurality of iron plates 22 partially embedded in the upper and lower wall portions 12 and protruding from the lower end surface and the upper end surface of the two wall portions facing each other toward one of the other. 22 and a bolt and nut assembly 24 that penetrates and fastens. Each iron plate 22 has a width slightly smaller than the thickness of the wall 12 and is arranged in parallel with the width direction of the wall 12 (the left-right direction in FIG. 4). A plurality of iron plates 22 extending downward and upward
Are substantially at the center in the width direction of the wall portion 12 and partially overlap with each other.

The connecting portion 14 having step plasticity, that is, the plurality of iron plates 22 overlapping each other, is plastically deformed when both walls 12 receive the predetermined horizontal force during an earthquake. Seismic forces are reduced due to the energy expended on this plastic deformation. The plurality of iron plates 22 also have a bending strength smaller than the bending strength of the slab 10.

The connecting portion 14 may be made of high-attenuation rubber fixed to the lower end surface and the upper end surface of the upper and lower wall portions 12 instead of the illustrated example. The high damping rubber has viscoelasticity. According to this, the connecting portion 14 is deformed when the two wall portions 12 receive the preset horizontal force during an earthquake, and the seismic force is attenuated with this deformation. The high damping rubber also has a bending strength smaller than the bending strength of the slab 10.

The two plate portions 16 are respectively provided with the upper and lower wall portions 12.
It is made of a precast concrete plate reinforced with steel bars integrally formed with the steel plate. The illustrated plate portions 16 protrude on both sides of each wall portion 12. But,
Each plate portion 16 may project from only one side of each wall portion 12. Further, each plate portion 16 may be made of an iron plate or a steel plate fixed to each wall portion 12 instead of the illustrated example. By providing the plate portion 16, each plate portion 1
Through 6, the wall 11 can be fixed to each slab 10.

To fix the wall body 11 to each slab 10, a plurality of holes 24 and 26 are provided in advance in each slab 10 and each plate portion 16 so as to match each other.
Through a bolt 28 and screwing a nut 30 to the bolt. Alternatively, instead of this, the surface of each plate portion 16 facing each slab 10 is finished to have an uneven surface in advance, and mortar (not shown) is injected between each slab 10 and each plate portion 16. Can also be fixed.

The wall 11 can be installed between the two slabs 10 via the two plate portions 16 as described above, thereby improving the earthquake resistance of the building. Wall 11
May be elongated and small in width or large in width as necessary. In addition, one or more wall bodies 11 can be installed as needed.

Since the wall 11 is divided into two parts,
In particular, transportation work in an existing building where residents live is easy. Further, each wall portion 12 is lighter than the entire wall body 11, and assembling and installation work on site is easy.

[Brief description of the drawings]

FIG. 1 is a front view of an earthquake-resistant wall installed between two slabs.

FIG. 2 is a perspective view of a wall.

FIG. 3 is a front view of another example of an earthquake-resistant wall.

FIG. 4 is a partial front view of a wall having a connection portion of another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Slab 11 Wall 12 Wall 14 Connection 16 Plate 18 Solidified mortar 20 Reinforcing bar

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Norimitsu Hayashida 1043 Oga Onigabo, Tsukuba, Ibaraki Pref. Inside Kumagaya Gumi Technical Research Institute Co., Ltd. Inside the Gumi Technical Research Institute

Claims (4)

[Claims] 1. A wall used for seismic reinforcement of an existing building, comprising: upper and lower walls made of precast concrete; and a connecting portion between said walls for connecting said walls. A seismic reinforcement wall body comprising a plate portion connected to each wall portion and fixed to each of upper and lower slabs of the building, wherein the connection portion has brittleness, elastoplasticity or viscoelasticity. 2. The wall body according to claim 1, wherein the connection portion includes a mortar and a plurality of reinforcing bars embedded in the mortar and extending from the both wall portions toward one another. 3. A seismic retrofit structure for an existing building, comprising at least one wall located between upper and lower slabs of the building, wherein the wall is made of precast concrete. A connecting portion between the two wall portions and connected to the two wall portions, and a plate portion connected to each wall portion and fixed to each slab, the connecting portion is brittle,
Elastoplastic or viscoelastic, seismic reinforced structure. 4. The structure according to claim 3, wherein the connecting portion comprises a mortar and a plurality of reinforcing bars embedded in the mortar and extending from the both walls toward each other.