JPS6327504B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthquake-resistant structure using a rocking method of earthquake-resistant precast concrete wall slabs (hereinafter referred to as PC wall slabs) and beams.

To place PC shear walls as earthquake-resistant elements within a structure, there are various methods for connecting them and for managing gaps with surrounding columns and beams. In an earthquake-resistant structure using the locking method, in which a PC shear wall is joined to a beam at two points, the top and bottom, the structure is unstable if there is nothing else to support the PC wall slab, so it is usually held in place using cotters.

It has also been considered to stabilize the gap between the PC wall slab and the beam by filling it with mortar, etc., but in such a case, when a horizontal force is applied, the PC wall slab in contact with the filler Frictional resistance occurs at the edges of the beam, making analysis of the force at the joint with the beam complicated, making it difficult to create a simple design.

This invention does not rely on connectors as in the past.
Although the PC wall slab is stabilized by filling the void formed between the beam and the PC wall slab with concrete, tensile stress always occurs at the center of the PC wall slab, and the center of the wall slab is always This project provides an earthquake-resistant structure consisting of a new PC wall plate and beam that is highly tough and exhibits a bending-yielding type that is constantly subjected to tensile stress and compressive stress at the edges.

This invention for the above purpose has a joint part at the top and bottom of the center, and the top and bottom joint parts are connected by a tensile material.
The PC wall slab is joined to the beam at two points, above and below the center, through joints, and the gap between the bottom edge of the PC wall slab and the beam is filled with concrete, and the concrete and PC
The gist is that an insulating layer is provided at the boundary with the lower side of the wall slab to prevent the transmission of tensile force.

The present invention will be explained in detail below using illustrated examples.

1 is a PC wall plate, 2 is a beam. The above-mentioned PC wall slab 1 has joint plates 11 and 12 embedded as joining members in the center of the upper side and lower side, respectively, and both joint plates 11 and 12 are connected by tension members 13 made of a required number of parallel reinforcing bars. connected. Also, the upper side of this PC wall plate 1 is formed horizontally, but the lower side is formed by the joint plate 12 in the center.
It is sloped upward from the part on both sides.

In the gap between the sloped lower side of the PC wall plate 1 and the beam 2,
The above-mentioned concrete 3 is filled by post-casting, and the boundary between the sloped lower side and the sloped upper side of the concrete 3 is
It is configured with an insulating layer 4. This insulating layer 4
PC wall plate 1 was installed before concrete 3 was poured.
It can be easily configured by applying a release agent or a synthetic resin sheet such as polyethylene to the lower sloped side of the
Completely edge the bottom of the slope and the top of the concrete.

The beam 2 and the PC wall plate 1 are joined by applying the plate 5 across the joint plates 21, 21 on the beam side and the joint plates 11, 12 on the wall plate side, and inserting the plate 5 into both joint plates. This is done using a high-strength bolt and a nut screwed into the high-strength bolt.

In the above structure, as shown in Fig. 3, the beams 2, 2
When a horizontal force is applied to the PC wall slab 1, the tension side half of the PC wall slab 1 has no resistance because it is insulated from the concrete 3, and tensile stress is always generated at the wall slab centers B and B' that connect joints A and A'. It turns out. This is true even if the horizontal force is reversed, as shown in FIG. 3; the center of the wall slab is always under tensile stress, and the other half of the lower edge is always under compressive stress.

Since the compressive stress at this time acts at an angle to the vertical axis within the plate, it is approximately perpendicular to the acting direction of the compressive stress. The filled concrete must have sufficient compressive strength.

Furthermore, since the horizontal reaction force at this time can be treated by the frictional resistance caused by the compression reaction force, only the vertical force acts on the lower joint A'. On the other hand, since there is no bending stress at the upper joint A, only horizontal force acts on it.
Only simple stress occurs in both the upper and lower joints A and A'.

In the above embodiment, the lower side of the PC wall slab 1 is formed to be inclined, but even if the lower side is horizontal, the PC wall slab is joined to the beam at two points above and below the center, and the above boundary does not connect to the insulating layer. The present invention is not particularly limited to the embodiments, since the same effects as those described above can be achieved as long as the present invention is configured as follows.

As mentioned above, this invention is based on a PC equipped with tensile material.
Connect beams 2, 2 through the joints at two points above and below the center of the wall slab.
At the same time, the gap between the lower side of the PC wall slab and the beam 2 is filled with concrete 3, and an insulating layer 4 is provided at the boundary between the lower side of the PC wall slab and the concrete without providing connectors such as reinforcing bars. By layer 4
The lower side of the PC wall slab and the beam are insulated to prevent transmission of tensile force, and the stress between the PC wall slab and the beam is configured so that compressive stress is transmitted but tensile stress is not transmitted. Therefore, the bending moment caused by the horizontal force will be resisted at the joint between the half-width compression side concrete and the center of the wall slab, thus reducing the effective bending stiffness of the PC wall slab. Bending deformation is superior to shearing deformation, and by tensile yielding the tensile material that spans the upper and lower joints, it is possible to obtain an earthquake-resistant structure with high toughness that precedes bending yield, and the stress at the joints is reduced by reducing the stress at the upper joints. It has the advantage that the structural design process is simple and clear because only the shear force needs to be dealt with, and the lower joint only needs to deal with the tensile force.

[Brief explanation of the drawing]

The drawings illustrate the earthquake-resistant structure of PC wall slabs and beams according to the present invention, and Fig. 1 is a partially vertical front view;
FIG. 2 is a central longitudinal cross-sectional view, and FIG. 3 is an explanatory view of the operation. 1...PC wall slab, 2...beam, 3...concrete, 4
...Insulating layer, 13...Tensile material, A, A'...Joint part, B,
B′…Mainly wall editions.

Claims (1)

[Claims] 1 A PC wall slab with joints at the top and bottom of the center and connected by tensile material is connected to the two joints at the top and bottom of the center.
At the same time, it is connected to the beam through the joint at the point, and the gap between the lower side of the PC wall slab and the beam is filled with concrete, and an insulating layer is provided at the boundary between this concrete and the lower side of the PC wall slab to prevent the transmission of tensile force. Earthquake-resistant structure with PC wall slabs and beams.