JP2008007945A - Earthquake resistant structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for improving the earthquake resistant performance by disposing a waveform steel plate having a small resistance to the vertical axial force and bending in the out-of-plane direction although resisting internal bending and shearing force as a wall outside the structural plane of a column-beam frame between beams or slabs of upper and lower floors. <P>SOLUTION: As a wall erected between the beams or slabs of upper and lower floors causing inter-layer deformation by horizontal force, the waveform steel plate is disposed with the folding line pointing in the horizontal direction, a flange steel plate is connected to the waveform steel plate along the right and left side parts, a base plate is joined thereto along the upper and lower horizontal side parts, and the flange steel plate and the base plate are integrally joined at the intersection points to form a frame. The upper and lower base plates are joined to the beams or slabs of the upper and lower floors through a shearing force transmission element and installed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of seismic structures that absorb energy by surrendering to horizontal forces acting on buildings due to earthquakes, winds, etc., and more specifically, internal bending and shearing as walls outside the structure of column beam frames. The present invention relates to a structure that improves seismic performance by disposing corrugated steel plates between vertical beams and slabs on the upper and lower floors, which resists force but has low resistance to vertical axial force and out-of-plane bending.

  Conventionally, in order to cope with frequent earthquakes, it is practical to place a horizontal wall in the construction surface of a column beam (large beam) frame and to bear a horizontal load mainly by a compression bundle formed diagonally. It is provided. Especially in existing buildings, in order to secure further horizontal rigidity and proof strength, the RC wall can be freely arranged on the partition walls outside the structure of the column beam frame, sleeve walls, waist walls, etc. The accuracy and flexibility of reinforcement are improved.

  In addition, as a method for seismic reinforcement of a location outside the structure of the column beam frame, Patent Document 1 below provides a work hole penetrating from the lower floor to the reinforcement installation floor at a location other than the column beam frame in the slab of each floor. A pillar that penetrates the work hole is built in the foundation of the existing building, a reinforcing beam is built between the pillars to form a column beam structure, the work hole is closed, and the reinforcing beam is integrated with each slab. A technique for constructing a reinforcing frame is disclosed.

JP 2005-179978 A

  As shown in FIG. 8, the RC wall 30 is joined only to the upper and lower slabs 31 and 31 as shown in FIG. The portion X to which the wall 30 is attached is restrained from out-of-plane deformation, and large out-of-plane shear and out-of-plane bending moments are concentrated on the end Y of the wall 30 of the slab 31 to cause great damage to the slab 31. There is a problem of giving.

It is recognized that the earthquake-resistant reinforcement frame of Patent Document 1 is also subjected to earthquake-proof reinforcement even at locations outside the column beam frame. However, since it is constructed in a layered structure from the lower floor to the reinforcement installation floor, a considerable weight is applied to the beam on the lowermost floor in particular, and the axial force or the bending force in the out-of-plane direction causes the beam (or Since the slab is intensively added to the slab, it is necessary to construct a further reinforcing structure on each of the beams, resulting in high costs and poor work efficiency.
In addition, since the seismic retrofit frames are constructed in order from the lower floor, unnecessary work is added to the lower floors that are not related, and there is a problem that separate work cannot be performed for each floor and work efficiency is significantly deteriorated. .

  By the way, a corrugated steel sheet having mechanical properties such as a large shear strength and rigidity against in-plane bending and shear, a high degree of freedom in rigidity and strength design, and a small resistance to axial and out-of-plane bending forces. I have not seen or heard about the point where it is placed outside the surface of the column beam frame and is seismically strengthened.

  The object of the present invention is to construct a corrugated steel plate as a wall body to be built between the small beams on the upper and lower floors or between the slabs outside the structural surface such as the column beam frame, to reduce the reinforcement of the slabs or small beams, The purpose is to provide a seismic structure that exhibits high precision seismic effect and improves work efficiency.

As means for solving the problems of the background art described above, the earthquake-resistant structure according to the invention described in claim 1 is:
The corrugated steel sheet is placed outside the surface of the column beam frame, and the corrugated steel plate is placed in the horizontal direction between the upper and lower beam beams or slabs that generate interlayer deformation by horizontal force.
A flange steel plate is connected to the corrugated steel plate along the left and right side portions, a base plate is joined along the upper and lower horizontal sides, and the intersection of the flange steel plate and the base plate is integrally joined. A frame is formed,
The upper and lower base plates are installed by being joined to the upper and lower floor beams or slabs via a shearing force transmitting element.

The invention described in claim 2 is the earthquake resistant structure described in claim 1,
One side or both sides of the flange steel plate connected along the left and right side portions of the corrugated steel plate are connected to each other via a stud and a shearing force transmission element.

The invention according to claim 3 is the earthquake resistant structure according to claim 1 or 2,
A plurality of corrugated steel sheets are connected in the vertical direction and the horizontal direction.

The earthquake-resistant structure according to the invention described in claim 1 or 2 has the following effects.
Since the corrugated steel sheet is placed with its fold line in the horizontal direction as a wall to be built between the beams on the upper and lower floors or between the slabs outside the surface of the column beam frame, the corrugated steel sheet has vertical axial force or torsional deformation, etc. It exerts the mechanical characteristics that allow it without resisting the outward bending force, so that excessive axial force, shearing force and bending moment do not occur at the place where the wall of the beam or slab is attached. There is no special need for reinforcement, and even if there is, it can be handled with minor reinforcement. Moreover, it can be equally applied to the wall constructed outside the structure of the column beam frame, and the degree of freedom in design is greatly improved, so that a highly accurate seismic effect can be exhibited.
Moreover, since the seismic structure of the present invention constructs a wall body using corrugated steel sheets on the same floor, it contributes to efficient work without unnecessarily affecting the work on the upper and lower floors.

  According to the invention described in claim 3, since the corrugated steel sheets are combined by combining a plurality of corrugated steel sheets in the vertical direction and the horizontal direction, the width and height can be freely adjusted according to the installation location, and the design can be freely performed. The degree is improved and it is easy to carry.

  In the present invention, the corrugated steel plate 5 is located outside the plane of the column 1 beam 2 frame and is built between the upper and lower beam beams or between the slabs 4 that generate interlayer deformation by horizontal force. The flange steel plate 6 is connected along the left and right side portions of the corrugated steel plate 5, the base plate 7 is joined along the upper and lower horizontal sides, and the flange steel plate 6, the base plate 7, The frame 8 is formed by integrally joining the intersections, and the upper and lower base plates 7 and 7 are installed by being joined to the upper and lower floor beams or slabs 4 and 4 via the shearing force transmitting element 9. It is the structure which is done.

A seismic isolation reinforcing structure according to the present invention as set forth in claim 1 will be described with reference to FIGS.
As shown in the plan view of FIG. 1, the present invention is outside of the structure of the column beam structure of the column 1 and the large beam 2 and is installed between the small beams or between the slabs 4, such as partition walls, sleeve walls, waist walls, etc. The corrugated steel plate 5 is preferably implemented in the wall body 3 and has a structure in which the corrugated steel sheet 5 is oriented in the horizontal direction and resists horizontal shearing force but has little resistance to axial and out-of-plane bending. Implemented.

  Although the corrugated steel sheet 5 is not specifically illustrated, the corrugated steel sheet 5 is a combination of small corrugated steel sheets having a small number of waves, for example, about two, connected in the vertical direction and the horizontal direction. Built to width and height. Accordingly, the width and height can be freely adjusted according to the installation location, so that the degree of freedom in design is improved and transportation is easy (the invention according to claim 3).

As shown in FIG. 2, the flanged steel plates 6, 6 are connected to the corrugated steel plate 5 connected and constructed as described above along the left and right side portions thereof by welding or the like. Further, base plates 7 and 7 for transmitting a shearing force along the upper and lower horizontal sides of the corrugated steel plate 5 are also joined by welding or the like. The flange steel plate 6 and the base plate 7 are integrally joined at their intersections to form a frame 8. The frame 8 has a length that is sufficiently wider than the thickness of the corrugated steel sheet 5 provided in a straight line, and the frame 8 firmly resists the horizontal force borne by the corrugated steel sheet 5 and moves to the upper and lower slabs 4, 4. It is a configuration to be transmitted.
Thereafter, the upper and lower base plates 7 and 7 and the upper and lower floor slabs 4 and 4 are joined together by a shearing force transmitting element 9 as shown in FIGS. 3A and 3B.

  The shear force transmitting element 9 is formed by passing a PC steel rod or a bolt 90 or the like through a hole (not shown) provided in the base plate 7 through a hole (not shown) previously attached to the slab 4. To be joined by tightening with a nut 91 or the like.

Of course, the present invention is not limited to this, and as shown in the enlarged view of FIG. 4, the stud bolts 10 are directed from the base plate 7 toward the slab 4 and from the slab 4 toward the base plate 7. There is also a method in which the spiral muscles 11 are arranged in a length that stays in the span, and the mortar is filled and connected after the spiral muscle 11 is arranged in the span.
Furthermore, although illustration is omitted, a method of applying an adhesive to the contact surface between the slab 4 and the base plate 7 and joining them may be considered.

The corrugated steel plate 5 has a folded plate shape (FIG. 2). The folded plate shape is formed in a rectangular wave shape and is configured to obtain unique mechanical characteristics. However, the cross-sectional shape of the corrugated steel sheet 5 is not limited to the example shown in FIGS.
As an inherent mechanical characteristic, each of the folded plates of the corrugated steel plate 5 sufficiently resists the shearing force against the horizontal shearing force, and the whole as a set is sufficiently resistant to the horizontal shearing force. Make a big resistance.

  Since the corrugated steel plate 5 is a folded plate, the shear rigidity and strength are not only the strength inherent to the steel material, but also the size of the plate (usually about 9 mm to 22 mm), the number of overlaps, and the pitch (typically 500 mm). About 700 mm) and the wave height (usually about 80 mm to 150 mm).

  Further, since the corrugated steel plate 5 is a folded plate, the axial force perpendicular to the corrugated streak freely expands and contracts like an accordion, and the rigidity and proof stress are small. Similarly, bending and bending within the corrugated surface can be freely expanded and contracted like an accordion to allow compression and tension, so that rigidity and yield strength are small. Therefore, even if the slab 4 has an RC structure, an SRC structure, or the like, it does not bear the axial force of the concrete slab 4 due to concrete creep or drying shrinkage, and does not change the mechanical characteristics as a seismic wall. . In particular, at the place where the wall 3 is attached, excessive axial force, shearing force and bending moment do not occur, and there is no special need for reinforcement, and even if there is, it can be handled with slight reinforcement. Further, no additional axial force is introduced at the time of construction and in service, the shear buckling strength and toughness of the corrugated steel sheet 5 are maintained at a high level, and secular change may occur with respect to the shear deformation at the time of earthquake. Excellent seismic function.

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 (torsion and shearing) in the direction parallel to the corrugating folding line. ) Has a small resistance because it is a folded plate. Therefore, the rigidity and strength of the seismic wall can be easily controlled independently, and the degree of freedom in design is extremely high.
Furthermore, the height of the corrugated peaks and valleys (wave height) is such that it can be accommodated within the thickness dimension of the door wall (for example, 80 mm to 150 mm), so that it can be carried out without adversely affecting the floor area of the living room. There is also.

Moreover, since it is the above structures, it can apply equally to any wall body outside the structure of a column beam structure, a design freedom is improved greatly, and a highly accurate earthquake-resistant effect can be exhibited.
Moreover, since the seismic structure of the present invention constructs the wall body 8 incorporating the corrugated steel plate 5 on the same floor, it can be constructed with an efficient work without unnecessarily affecting the work on the upper and lower floors.

The seismic structure of the present invention is not limited to be implemented by joining only the upper and lower slabs 4 and 4 shown in FIGS. As shown in FIGS. 5A and 5B, when the pillars 12 and the large beams 2 are out of the plane of construction, for example, when the studs 12 are constructed on the large beams 2, first, the first embodiment described above is used. In this way, the corrugated steel plate 5 is placed between the upper and lower slabs 4 and 4 with the fold line directed in the horizontal direction, and the base plate 7 forming the upper and lower horizontal sides of the frame 8 and the same slab 4 are connected by the shearing force transmitting element 9. And incorporate. Next, one side (left side in the figure) of the flanged steel plate 6 connected to the left and right side portions of the corrugated steel plate 5 and the stud 12 are also joined by the shear force transmission element 9 to construct the wall body 13. It is preferably implemented.
As described in the first embodiment, the shear force transmitting element 9 is connected to a PC steel rod or bolt 90, or a stud bolt 10 and a spiral bar 11 as shown in FIG. A method or the like is appropriately performed.
Moreover, as shown in the figure, the spacer 12 and one side of the flange steel plate 6 may be simply joined by an adhesive.

  In FIGS. 5A and 5B, the case where only one side (left side) of the pillars 12 is joined is shown. However, the present invention is not limited to this, and as shown in FIGS. 6A and B, the pillars 12 and 12 are constructed on both sides. In this case, the wall body 14 can also be constructed by connecting the both sides of the flange steel plates 6 and 6 and the pillars 12 and 12 on both sides (left and right) via the shearing force transmitting element 9. The shearing force transmitting element 9 is as described in the first and second embodiments.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention.

It is a top view which shows the structure outside which implements the earthquake-resistant structure which concerns on this invention. It is a figure which shows an example which joined the flange steel plate and the baseplate to the corrugated steel plate, and formed the frame. A is an elevational view of the seismic structure according to the present invention. B is a side view of A. FIG. It is the enlarged view which showed the other Example of the shearing force transmission element. A and B are figures which show the concept of Example 2 of the earthquake-resistant structure based on this invention. A and B are figures which show the concept of Example 3 of the earthquake-resistant structure based on this invention. AD is explanatory drawing which showed the different cross-sectional shape of a corrugated steel plate. It is the reference figure which showed the subject of the prior art example notionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column 2 Large beam 3, 13, 14 Wall body 4 Slab 5 Corrugated steel plate 6 Flange steel plate 7 Base plate 8 Frame 9 Shear force transmission element 10 Stud bolt 11 Spiral muscle 12 Spacer

Claims (3)

The corrugated steel sheet is placed outside the surface of the column beam frame, and the corrugated steel plate is placed in the horizontal direction between the upper and lower beam beams or slabs that generate interlayer deformation by horizontal force.
A flange steel plate is connected to the corrugated steel plate along the left and right side portions, a base plate is joined along the upper and lower horizontal sides, and the intersection of the flange steel plate and the base plate is integrally joined. A frame is formed,
A seismic structure, wherein the upper and lower base plates are installed by joining the beam or slab on the upper and lower floors via a shearing force transmitting element.   The seismic structure according to claim 1, wherein one side or both sides of the flange steel plate connected along the left and right side portions of the corrugated steel plate are connected to each other via a stud and a shear force transmitting element.   The seismic structure according to claim 1 or 2, wherein a plurality of corrugated steel plates are connected in a vertical direction and a horizontal direction.

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