JPS602464B2 - shear wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shear wall for imparting earthquake resistance to a building structure.

Conventional reinforced concrete shear walls have high rigidity and strength, but they lack rut resistance, and when horizontal external forces such as earthquakes act, the amount of deformation from reaching the maximum strength to failure is small, and the amount of energy absorbed by the shear wall is small. It is not suitable for earthquake-resistant walls of high-rise buildings, etc.

In order to solve these problems, the present invention attaches reinforcement horizontal frames of rigid frame structure to both sides of a reinforced concrete wall along the outer periphery of the wall, and connects these foundation frames with a plurality of bolts. It penetrates through a reinforced concrete wall and is integrally fastened to provide a shear wall that not only has initial rigidity against horizontal external forces that act during an earthquake, but also has appropriate rigidity even during large deformations, and has excellent ballistic properties. It is.

To explain an embodiment of the present invention with reference to the drawings, reference numeral 1 refers to a reinforced concrete wall formed in a rectangular space surrounded by columns 2 and beams 3, and a plurality of reinforced concrete walls penetrating the outer periphery between the front and back sides. Bolt insertion holes 4 are bored at appropriate intervals in the circumferential direction.

Reference numerals 5 and 5 denote a pair of reinforced concrete transverse frames formed in the shape of a rectangular picture frame, the outer peripheral end surfaces of which are sized to be close to the inner peripheral surface of the square portion formed by the columns 2 and beams 3. Further, bolt mounting holes 6, 6. are formed at substantially the same diameter at the same intervals as the bolt insertion holes 4 so as to coincide with the bolt insertion holes 4.・・・・・・6 has been set.

The above-mentioned reinforced concrete wall 1 has a formwork arranged in the rectangular space in which the wall 1 is formed, and a plurality of steel or synthetic resin molds that protrude into the outer periphery of the rectangular space. By fixing and installing the pipe 4a, placing reinforcing bars 7 at appropriate intervals, and pouring concrete 8, the pillar 2 and beam 3 are integrally constructed as shown in Figs. 1 and 2. The hole in the pipe 4a serves as the bolt insertion hole 4.

On the other hand, the supplementary horizontal frame 5, which has a rigid frame structure whose outer shape is a rectangular frame along the outer periphery of the seismic wall 1, is manufactured separately in a factory or the like, and the pipe 4a is attached to the formwork for forming the supplementary horizontal frame 5. A plurality of steel or synthetic resin pipes 6a are installed at the same intervals as the pipes 4a at opposite positions, and reinforcing bars 9 are arranged to form a rigid frame structure, and then concrete 10 is poured. Pipe 6a as shown in
Thus, the complementary horizontal frame 5 in which the bolt mounting holes 6 are formed is obtained.

As shown in FIGS. 4 and 5, the two supplementary horizontal frames 5 constructed in this manner are placed close together on both the front and back sides of the above-mentioned reinforced concrete wall 1, and each bolt mounting hole 6 of one of the tub horizontal frames 5 is installed. A bolt 11 is inserted into the bolt installation hole 6 of the other cross-section frame 5 through the bolt insertion hole 4 of the reinforced concrete 1, and a nut 12 is screwed onto the bolt 11, thereby forming the reinforced concrete wall 1 into a pair of cross-sections. While being held between frames 5 and 5 -
It forms a physically connected seismic wall.

In addition, before or after fastening with the bolt 11,
Fill each bolt mounting hole 6 of the horizontal frame 5, 5 with adhesive material.
is filled in an appropriate manner to eliminate the gap between the bolt mounting hole 6 and the outer circumference of the bolt. In the above-mentioned embodiment, the shape of the supplementary horizontal frame 5 was a picture frame shape in which the entire center part was formed as a space, but as shown in FIG. Furthermore, a corbel 13 may be provided at a corner of the inner periphery.

Further, although the bolt insertion holes 4 and the mounting holes 6 are formed using the pipes 4a and 6a, the present invention is not limited to this, and they may be formed by drilling holes in the reinforced concrete wall 1 and the supplementary horizontal frame 5 after the concrete has hardened. Furthermore, the supplementary horizontal frame of the rigid frame structure may be made of steel instead of being made of reinforced concrete.

Regarding the operating characteristics of a seismic wall constructed in this way, for example, when a rigid frame frame is attached to a conventional wall with adhesive, when a horizontal load is applied, the seventh
As shown in the figure, when the maximum proof stress point X is reached, the amount of deformation until failure is small, and the relationship between the load and the amount of wall deformation shows a hysteresis characteristic as shown by the dotted line. According to a conventional shear wall in which auxiliary equipment frames 5, 5 of a rigid frame structure are integrally fastened to each other with bolts 11 and attached to both sides of a reinforced concrete shear wall 1, the horizontal load and deformation acting on the wall are As a result of experiments, it was confirmed that the hysteresis characteristic with respect to the amount is similar to that of the a-line.

This is because the bucket horizontal frames 5, 5 are arranged on both sides of the wall 1 and are integrally fastened to each other by bolts 11 penetrating the wall 1, so when an external force acts on this seismic wall, the horizontal Frame 5,5
This can restrain the concrete on the wall from peeling off, and the horizontal external force is transmitted from the wall 1 to the horizontal reinforcement frames 5, 5 through the bolts 11, and the energy is absorbed by the elasticity of the bolts 11. Complementary horizontal frame 5,5
It is thought that even after the shear wall reaches its maximum strength, its strength does not decrease and it exhibits strong properties.

This property is well established as a seismic wall, and the present invention is characterized by imparting such a property to a seismic wall. In addition, in FIG. 6, b and c show diagrams of the amount of deformation of the reinforced concrete wall and the supplementary horizontal frame, respectively, with respect to the horizontal load.

1 As described above, the present invention attaches Tachibana-groove frames with a rigid frame structure to both sides of a reinforced concrete wall along the outer periphery of the wall, and connects the two supplementary horizontal frames with a plurality of bolts that penetrate the reinforced concrete wall. Since it is related to a shear wall characterized by integrated fastening, the reinforcement frame of the rigid frame structure, which is integrally connected via bolts, is in close contact with both sides of the reinforced concrete wall, so it will not be damaged in the event of an earthquake. When a horizontal external force is applied, peeling of the reinforced concrete wall can be suppressed as much as possible, and the energy of the external force acting on the concrete wall can be absorbed by the bolts to form a shear wall with excellent plowability. Even after the reinforced concrete wall reaches its maximum strength, the strength does not decrease and it exhibits excellent earthquake resistance.

Furthermore, the earthquake-resistant wall structure of the present invention can be easily formed by attaching the above-mentioned rigid frame reinforcement horizontal frame to the wall of an existing building, and the rigidity of the reinforcement horizontal frame and the number of fastening bolts can be reduced. By adjusting it appropriately, a seismic wall having desired rigidity and strength can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figure 1 is a partially cutaway front view of a reinforced concrete wall with bolt insertion holes, Figure 2 is a cross-sectional view thereof, and Figure 3 is a partially cutaway view of a supplementary horizontal frame. Front view,
Fig. 4 is a front view of the shear wall, Fig. 5 is its cross-sectional view, Fig. 6 is a front view showing another example of a supplementary horizontal frame, and Fig. 7 is a diagram showing the relationship between load and deformation of the shear wall. It is. 1... Reinforced concrete wall, 4... Bolt insertion hole, 5... Auxiliary machine frame, 6... Bolt mounting hole, 11... Bolt. next

Claims (1)

[Claims] 1. A reinforcement frame of a rigid frame structure is attached to both sides of a reinforced concrete wall along the outer periphery of the wall, and both reinforcement frames are integrally fastened together with a plurality of bolts that penetrate the reinforced concrete wall. Shear wall.