JP4563872B2 - Seismic wall - Google Patents

Description

The present invention belongs to the technical field of a seismic wall in which corrugated steel plates are incorporated in a plane of a column beam frame or a column slab frame so that the folding line is in a horizontal direction. The present invention relates to a seismic wall that sufficiently exhibits the high deformation performance inherent to corrugated steel sheets and the high energy absorption capability due to shear yielding.

Conventionally, in-situ concrete or precast concrete wall structures that are generally employed are difficult to control strength and rigidity, and it is difficult to expect deformation ability while maintaining a predetermined strength. The required performance of the shear wall is to design the rigidity and strength appropriately. That is, the variable stiffness function having a high strength against seismic force and excellent deformation performance (toughness) with high proof stress is satisfied. Inventions aimed at achieving this object are disclosed, for example, in Patent Documents 1 and 2 below. However, the disclosed inventions of Patent Documents 1 and 2 cannot control the bending rigidity with respect to the out-of-plane force. Patent Document 3 discloses a corrugated plate-made disaster-shielding wall in which a deck plate (corrugated steel plate) is incorporated in the plane of a column beam frame or a column slab frame. The technical idea of the seismic wall that I focused on has not been heard yet.
Japanese Patent Publication No.62-31148 Japanese Patent No. 2944050 In order to achieve the above object, the present applicant also resists horizontal shearing force, but has low resistance to vertical axial force and bending in the out-of-plane direction, and design of rigidity and strength. A seismic wall with a high degree of freedom was developed and a patent application was filed separately (Japanese Patent Application No. 2004-224230 or Japanese Patent Application No. 2004-221368).

6A and 6B show an example of a frame that generates interlayer deformation by a horizontal force. Pillars a, a on both sides
And the upper and lower beams b, b are column beam frames a, b.
However, the folding lines are incorporated in a horizontal arrangement, and the column beam frames a and b and the corrugated steel sheet c are joined so as to be able to transmit a horizontal force.

The corrugated steel sheet has a folded plate shape in longitudinal section, and the shape is formed, for example, in a rectangular wave shape to obtain mechanical characteristics. The cross-sectional shape of the corrugated steel sheet is not limited to this, and refers to, for example, the trapezoidal wave shape (FIG. 7A), the triangular wave shape (FIG. 7B), the circular arc shape (FIG. 7C) and the like illustrated in FIG.

As for the mechanical characteristics, each of the folded sheets of the corrugated steel plate sufficiently resists the shearing force with respect to the horizontal shearing force, and the whole as a whole sufficiently resists the horizontal shearing force. To do. R
It has a sufficiently high shear strength as compared with the C wall, and exhibits excellent properties of toughness such that the deformation proceeds while maintaining the shear strength, thereby enabling high deformation performance.

Moreover, the shear rigidity and strength are not only the strength inherent to the material of the steel plate but also the thickness of the plate (typically 9 m
m to about 22 mm), the number of superpositions, the pitch (typically about 500 mm to about 700 mm), and the wave height (typically about 80 mm to about 150 mm).

Further, since the corrugated steel plate is a folded plate, the axial force perpendicular to the corrugated streak freely expands and contracts like an accordion, and the rigidity proof stress is much smaller. Also for bending in the corrugated plane, it expands and contracts freely like a similar accordion and allows compression and tension, so that rigidity and proof stress are small. On the other hand, the rigidity and proof stress against the out-of-plane force (bending and shearing) in the direction perpendicular to the corrugated folding line is sufficiently large because it is a folded plate, but the out-of-plane force (bending and shearing) in the direction parallel to the corrugating folding line. With respect to (shearing), since it is a folded plate, it exhibits a mechanical characteristic that resistance becomes small.

In the above-mentioned seismic wall according to the applicant's patent application, the corrugated steel plate effectively resists bending and shearing due to the horizontal force of the column beam frame or column slab frame, and the shear strength and rigidity become sufficiently large. High degree of freedom in designing the rigidity and strength of the frame, exhibiting small mechanical properties with low resistance to vertical axial force and out-of-plane bending force, providing high strength (proof strength) against earthquake force and high strength It is characterized in that it can be expected to have a variable stiffness function with excellent deformation performance (toughness).

However, when the burden of excessive vertical axial force concentrates on the column and the column reaches the limit deformation, there is a problem that the proof stress is rapidly lowered and brittle fracture occurs. Therefore, it is necessary to design the column with a margin so as not to be deformed until the limit deformation, or to install a reinforcing material such as a hoop bar more than necessary.

Further, in the earthquake-resistant wall of the above patent application, there is a concern that the corrugated steel plate is buckled out of plane by the vertical axial force. In such a case, there is a problem that it is difficult to fully exert the original power of the corrugated steel plate.

An object of the present invention is to provide a seismic wall that has a large vertical support capability and a high proof strength against a vertical axial force as a configuration that can reduce the burden of a vertical load concentrated on a column.

An object of the present invention is to provide a seismic wall that can sufficiently exhibit the high deformation performance inherent to the corrugated steel sheet and the high energy absorption capability due to shear yielding.

As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that the corrugated steel plate has a horizontal fold line in the horizontal direction in the plane of the column beam frame or column slab frame that generates interlayer deformation by horizontal force. incorporated in becomes disposed, in the longitudinal sides of the corrugated steel is bonded frame consisting of flat plate, the slab and the corrugated steel beams or pillars slab frames of column frames are joined can be transmitted horizontal force The inter-columns are joined to the upper and lower beams or slabs so as to be able to transmit a vertical load in the plane of the column beam frame or the column slab frame.

The invention described in claim 2 is characterized in that the studs are arranged so as to sandwich the corrugated steel sheet from both sides thereof and are joined to upper and lower beams or slabs so as to be able to transmit a vertical load.

According to a third aspect of the present invention, dowel bars projecting upward and downward are installed at the upper and lower ends of the studs, and are joined to the upper and lower beams or slabs via the dowel bars so that a vertical load can be transmitted. It is characterized by.

According to a fourth aspect of the present invention, the corrugated steel sheet is composed of folded plates that form peaks and valleys, and the upright portions along the vertical direction of the pillars of the folded plates are peaks and valleys of the corrugated steel sheets. A horizontal force is joined to the beam or the slab so as to be removed from the central axis at the center of the beam.

The seismic wall according to the present invention has a structure in which the inter-column is joined to the upper and lower beams or slabs in the plane of the column beam or column slab frame incorporating corrugated steel plates so that only vertical load can be transmitted. At the same time, it is possible to reduce the burden of the studs and the concentration on the pillars. Therefore, the overall vertical support capability is large, and the yield strength against the vertical axial force can be increased. In addition, since the arrangement in which the corrugated steel sheet is sandwiched from both side surfaces is made into a set, out-of-plane buckling of the corrugated steel sheet can be prevented by the same pillar, so that the high deformation performance and shear yielding inherent to the corrugated steel sheet can be prevented. High energy absorption ability can be fully demonstrated.

The corrugated steel sheet 1 is incorporated in the plane of the column beam frame 3 or 4 or the column slab frame that generates the interlayer deformation by the horizontal force in such a manner that the folding line is in the horizontal direction, and the column beam frame 3 or 4 or the column slab frame. And the corrugated steel plate 1 are joined so that a horizontal force can be transmitted. In the plane of the column beam frame 3, 4 or the column slab frame, the intermediate column 2 is joined to the upper and lower beams 4, 4 or slab so that only a vertical load can be transmitted.

  Hereinafter, the present invention will be described based on illustrated embodiments.

  1 to 3 conceptually show an embodiment of a seismic wall according to the present invention.

This seismic wall has a corrugated steel plate 1 in the plane of column beam frames 3 and 4 (which may be a column slab frame, the same shall apply hereinafter) as a representative example of a frame that generates interlayer deformation by horizontal force. It is incorporated in a horizontal arrangement, and the column beam frames 3 and 4 and the corrugated steel plate 1 are joined so as to be able to transmit a horizontal force.

It is sufficient that the corrugated steel plate 1 is joined to the column beam frames 3 and 4 so that horizontal force can be transmitted, and only the left and right vertical sides of the corrugated steel plate 1 and the column 3 of the column beam frames 3 and 4 are joined. Or, the upper and lower sides of the corrugated steel plate 1 and the beams 4 of the column beam frames 3 and 4 (hereinafter sometimes simply referred to as “beams”) may be joined to be able to transmit a horizontal force. it can. Of course, the four sides of the corrugated steel plate 1 can be joined to the column 3 and the beam 4 of the column beam frame 3, 4 so as to be able to transmit a horizontal force.

A method of incorporating the corrugated steel sheet 1 in the planes of the column beam frames 3 and 4 and joining them so as to be able to transmit a horizontal force is already described in, for example, the above Japanese Patent Application Nos. 2004-224230 and 2004-221368. Therefore, a part of the contents will be explained briefly. As illustrated in FIGS. 4A and 4B,
A joining frame 7 in which a horizontal force transmitting element 6 such as a stud is welded is integrally attached to the peripheral portion (four sides) of the corrugated steel plate 1. The corrugated steel sheet 1 is fitted into the in-plane portion of the concrete form forming the column beam frames 3 and 4, and concrete is placed in the concrete form frame, so that the column beam frame as shown in FIGS. 5A and 5B. A method of embedding the horizontal force transmitting element 6 such as the stud in the cast-in-place concrete portions of the columns 3 and 4 and the beam 4 so as to be able to transmit the horizontal force can be performed.

Further, as illustrated in FIG. 5A, a joint member 6 such as a stud bolt is embedded in the inner peripheral surfaces of the column beam frames 3 and 4 in advance at the time of manufacture in a concrete factory, or is provided by a method such as a hole-in anchor on the spot. . On the other hand, on the four circumferences of the corrugated steel sheet 1, a joining frame 7 having no stud is integrally attached. Then, the corrugated steel sheet 1 fitted into the frame surface of the column beam frames 3 and 4 is bonded to the joint frame 7 of the column beam frames 3 and 4 by bolting or welding or the like. A method of joining so that horizontal force can be transmitted by means is implemented.

Of course, the embodiments of the present invention are not limited to the above. In order to reliably prevent the shear failure of the concrete structure during the large deformation of the column beam frames 3 and 4, a slit that allows shear deformation is provided between the inner surface of the column 3 and the vertical side of the corrugated steel sheet 1. The slit is filled with a shear absorbing member such as a polystyrene foam molded product.

In the planes of the column beam frames 3 and 4 incorporating the corrugated steel plate 1, two sets of intermediate columns 2 and 2 are installed, each of which is a set of arrangements that sandwich (address) the corrugated steel plate 1 from both side surfaces thereof. The inter-column 2 is joined to upper and lower beams 4, 4 or a slab (hereinafter simply referred to as a beam) so that only a vertical load can be transmitted. The inter-columns 2 are preferably installed at intervals of about 2 m to 3 m in order to prevent lateral span buckling, and are basically formed of reinforced concrete, but may be formed of steel reinforced concrete. Furthermore, when the load of the vertical load is large, the number can be increased as necessary, the horizontal cross section can be increased, or further, the strength can be increased by winding a hoop or the like.

  The joining method of the said stud 2 and the upper and lower beams 4 and 4 is demonstrated below.

As an example of a method of joining the stud 2 to the upper and lower beams 4, 4, a plurality of sets of studs 2 arranged in a manner to sandwich the corrugated steel plate 1 from both sides include dowels protruding upward and downward at the upper and lower ends. The bars 5 and 5 are installed, and are joined to the upper and lower beams 4 and 4 through the dowel bars 5 so as to be able to transmit only a vertical load (the invention according to claim 2). The stud 2 may be manufactured on-site or as a precast concrete member.

First, the joining method in the case where the column beam frames 3 and 4 are newly constructed as a reinforced concrete structure or a steel-framed reinforced concrete structure on the spot will be described.

The dowel bars 5 of the studs 2 that are manufactured in-place or as precast concrete members are installed in the in-plane part of the concrete formwork that forms the column beam frames 3 and 4, and the concrete is placed in the concrete formwork By doing so, the dowel bars 5 are embedded in the beams 4 of the column beam frames 3 and 4 and are joined to the beam 4 so that only a vertical load can be transmitted.

Next, the joining method in the case where the column beam frames 3 and 4 are newly built as a precast reinforced concrete structure or a precast steel reinforced concrete structure or existing is described.

Dowel bars 5 projecting into the surfaces of the column beam frames 3 and 4 are embedded in the inner peripheral surface of the beam 4 in advance at the time of manufacture in a concrete factory. At the position where the dowel bar 5 protrudes, a concrete form forming the stud 2 is installed, and by placing concrete into the concrete form, the dowel bar 5 is embedded in the stud 2. It joins with the beam 4 so that transmission is possible only in the vertical direction.

In addition, when implementing the said stud 2 with a precast concrete member, it is previously called the stud 2
Holes for fitting the dowel bars 5 are formed in the upper and lower end portions of the dowel bars, and the dowel bars 5 are fitted and joined to the holes. Of course, the dowel bars 5 may be installed on the studs 2 and the dowel bars 5 may be fitted into the holes provided in the beam 4 and joined.

Therefore, since the interposition column 2 has a configuration in which the corrugated steel sheet 1 is sandwiched from both side surfaces, the out-of-plane buckling caused by the corrugated steel sheet 1 can be prevented. High energy absorption capability due to shear yielding can be fully demonstrated.

Although the present invention has been described above based on the embodiments, of course, the technical idea of the present invention is not limited to the above embodiments. It should be noted that there are various embodiments that can be modified and applied without departing from the spirit and gist of the present invention.

It is a front view which shows the earthquake-resistant wall which concerns on this invention. It is a cross-sectional view of the earthquake resistant wall of FIG. It is a longitudinal cross-sectional view of the earthquake-resistant wall of FIG. A is a front view of a corrugated steel plate with a joining frame having a horizontal force transmitting element such as a stud attached to the outer periphery, and B is a longitudinal sectional view of A. FIG. A is a front view of a seismic wall using the corrugated steel sheet of FIG. 4, and B is a longitudinal sectional view of A. FIG. A is a front view showing an example of a seismic wall that the applicant has already applied for a patent, and B is a longitudinal sectional view of A. FIG. AC is explanatory drawing which showed the different cross-sectional shape of a corrugated steel plate.

1 Corrugated steel plate 2 Interstitial column 3 Column 4 Beam 5 Dowel bar

Claims (4)

Corrugated steel sheets are incorporated in the plane of the column beam frame or column slab frame that generates interlayer deformation due to horizontal force, with the crease in the horizontal direction,
A frame made of a flat plate is joined to the vertical side of the corrugated steel sheet,
A slab corrugated steel beams or pillars slab Frames of Column Frames are joined can be transmitted horizontal force,
A seismic wall characterized in that inter-columns are joined to upper and lower beams or slabs so as to be able to transmit a vertical load in the plane of the column beam frame or column slab frame. The seismic wall according to claim 1, wherein the studs are arranged such that the corrugated steel plates are sandwiched from both surfaces, and are joined to upper and lower beams or slabs so as to be able to transmit a vertical load. The inter-column is provided with dowel bars protruding upward and downward at the upper and lower ends, and is joined to upper and lower beams or slabs via the dowel bars so as to be able to transmit a vertical load. The earthquake-resistant wall described in Item 1 or 2. The corrugated steel plate is composed of folded plates that form peaks and valleys, and the upright portion of the folded plate along the vertical direction of the pillar is removed from the central axis at the center of the peaks and valleys of the corrugated steel plates. The earthquake-resistant wall according to any one of claims 1 to 3, wherein a horizontal force is joined to the beam or the slab .

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