JPH0725413Y2 - Seismic retrofit wall - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an earthquake-resistant wall of a reactor building, etc., and is reinforced so as to prevent shear compression slip failure and improve shear strength. It concerns seismic retrofit walls.

[Problems to be solved by this device]

Seismic walls such as reactor buildings have a relatively large rebar ratio, and such seismic walls are generally destroyed by in-plane shear compression failure B, out-of-plane shear failure or in-plane shear failure of concrete as shown in Fig. 1. Outer bending fracture C often leads to the end. Reference numeral 1 is a constraining plate that serves as a metal fitting for mounting equipment piping. Such destruction of the earthquake-resistant wall often causes out-of-plane expansion of the wall surface, and conventional concrete walls have streaks, but they cannot be sufficiently prevented.

The present invention has been made to solve the above problems.A seismic reinforced wall that restrains out-of-plane expansion of a concrete wall and zigzags it when cracks occur to prevent shear failure. The purpose is to provide.

[Means for Solving the Problems]

The seismic strengthening wall according to the present invention restrains the concrete wall by a restraint plate in order to prevent out-of-plane expansion of the concrete wall.

Reinforcing bars are arranged vertically and horizontally in the concrete wall. A plurality of steel rods are penetrated in the thickness direction of this concrete wall. A sheath pipe is embedded in the concrete wall in advance,
You may make it pass through this sheath tube. PC as a horizontal bar
A steel rod or the like can be adopted, and it is preferable to screw a male screw on the outer circumference.

A constraining plate is brought into contact with both surfaces of the concrete wall, and the above-mentioned steel rod is penetrated. The shape of the constraining plate may be a rectangular, pentagonal, hexagonal, or other polygonal plate. A steel rod is passed through the hole of each restraint plate so that both tips are projected from the surface of the restraint plate.

A washer is put on the tip of the steel rod, and a nut is screwed on the steel rod to restrain both surfaces of the concrete wall by the restraint plates.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 2 shows a seismic strengthening wall A according to the present invention surrounded by beams 2 and columns 3. The constraining plates 1 are arranged close to the outer periphery of the seismic strengthening wall A, and also in the center. This is an example in which the constraining plate 1 is arranged. Among these constraining plates 1, there are a constraining plate 1a used for preventing shear fracture and a constraining plate 1a also serving as a device pipe mounting metal fitting.

Figures 3 and 4 show the RC plate for the experiment having the same structure as the seismic strengthening wall A used for the pure shear loading experiment.
A shear key 5 is assembled in a rectangular shape by being fixed to the reinforcing bars 4 arranged vertically and horizontally, and a sheath tube 6 is arranged at an appropriate position in the thickness direction. Concrete 7 is cast into a square shear key 5 to form a PC flat plate. A PC steel rod 8 having an external thread on its outer periphery is passed through each sheath tube 6, and a constraining plate 1 having a hole is passed through the tip of the steel rod 8 protruding from the concrete 7, so that the constraining plates 1 and 1 are both concrete 7. It is in contact with the surface. Further washers 9, 9 are passed through the tip of this steel rod 8,
The constraining plates 1, 1 are fixed by screwing the nuts 1a, 1a together.

Fig. 5 shows the result of the shear loading experiment conducted using the RC plate as described above. Fig. 6 shows a shear loading test conducted on RC flat plates of the same structure as a seismic wall made of normal steel and concrete only.

According to this, since the RC flat plate shown in Fig. 5 cannot be broken straight in the lateral direction due to the effect of the restraint plate, shear failure is caused from the corner of the test piece toward the central part, whereas In the case of the figure, early shear compression slip failure occurred straightly around the test body, and as a result, the shear strength of the one using the restraint plate 1 was higher than that of the unused one. Therefore, it can be understood that by providing the reinforcing structure according to the present invention, the shear compression slip failure of the earthquake resistant wall is prevented and the shear strength is improved.

[Effect of device]

Since the seismic reinforcing wall according to the present invention penetrates the steel rod in the thickness direction of the concrete wall as described above, the restraint plate is fixed to the steel rod by the nut, and the concrete wall is restrained from both surfaces by the restraint plates, This prevents out-of-plane expansion due to shear compression-slip failure of the concrete wall and significantly improves shear strength.

[Brief description of drawings]

Fig. 1 is a schematic diagram of the expected destruction type of earthquake-resistant walls, etc.
Fig. 1 is a front view of an embodiment of the seismic strengthening wall according to the present invention, Fig. 3 is a partial front view of an RC plate for experiment having the same structure as the seismic strengthening wall, Fig. 4 is its sectional view, and Fig. 5 is 3 is a front view of the experimental results using the RC flat plate shown in FIG. 3 and FIG. 4, and FIG. 6 is a front view of a normal experimental RC flat plate. A ... Seismic strengthening wall 1 ... Restraint plate, 2 ... Beam, 3 ... Column, 4 ... Reinforcing bar, 5 ... Shear key, 6 ... Sheath pipe, 7 ... Concrete, 8 ... PC steel rod, 9
... washers, 10 ... nuts.

Claims (4)

[Scope of utility model registration request] 1. A plurality of steel rods are pierced in a thickness direction of a concrete wall, and the steel rods are respectively pierced through a plurality of constraining plates abutting on both surfaces of the concrete wall and fixed by nuts. A seismic strengthening wall. 2. The seismic reinforcement wall according to claim 1, wherein the restraint plate is a rectangular plate. 3. The seismic strengthening wall according to claim 1, wherein the restraint plate is a pentagonal plate body. 4. The seismic strengthening wall according to claim 1, wherein the restraint plate is a hexagonal plate body.