JP3588731B2 - Building seismic energy absorption structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seismic energy absorbing structure of a steel structure building, which can improve the effect of absorbing seismic energy without making the outer peripheral opening very narrow.
[0002]
[Prior art]
By incorporating a member that absorbs input energy during an earthquake into a steel structure building, it is possible to reduce the response to an earthquake input and improve the seismic performance. Conventionally, an energy absorbing member is installed so as to close a core portion (opening) of a building, thereby absorbing seismic energy.
[0003]
[Problems to be solved by the invention]
However, if such an energy absorbing member is installed in the opening surrounded by pillars and beams on the outer periphery of the building, the opening is lost or narrowed, and when trying to secure a certain amount of opening, There was a problem that an effective energy absorption effect could not be achieved.
[0004]
The present invention has been made in consideration of the above circumstances, and has as its object to provide a seismic energy absorbing structure for a building that can enhance the effect of absorbing seismic energy without making the outer peripheral opening very narrow, mainly in a steel structure building. I do.
[0005]
[Means for Solving the Problems]
The seismic energy absorbing structure for a building according to the invention of claim 1 is characterized in that the upper and lower ends extend vertically along the respective columns near the left and right columns in the opening surrounded by the left and right columns and the upper and lower beams. An energy absorbing member joined to the beam by a fastening member is provided, and the energy absorbing member is formed of a band-shaped metal plate along the surface of the opening, and is used for plastic deformation at an arbitrary cross section in the height direction. In a seismic energy absorbing structure of a building in which the profile of the side edge in the width direction is set so that the bending stress is substantially constant, the profile of the side edge on the pillar side of the energy absorbing member is formed in a straight line, and The profile of the side edge of the side is formed as a vertically symmetric curve depressed toward the straight side at the center in the height direction, and the curve is a predetermined shape necessary for transmitting the shear stress between the straight line and the center at the center in the height direction. Secure the width, and form a parabolic shape that projects outwardly above and below it And characterized in that it.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a building 10 to which the embodiment of the present invention is applied, and FIG. 2 is a plan view of the building 10. This building 10 is a steel structure building of a ramen structure in which a frame is constructed by columns 1 and beams 2, and a rectangular opening surrounded by left and right columns 1 and 1 and upper and lower beams 2 and 2 is provided on the outer periphery of each floor. It has many parts 3.
[0008]
In the vicinity of the side surfaces of the left and right columns 1, 1 constituting the inner peripheral edge of each opening 3, an energy absorbing member 5 extending in the up and down direction is arranged along each column 1, 1. These energy absorbing members 5 are made of strip-shaped steel plates (metal plates) along the surface of each opening 3, and the upper and lower ends are bolted or riveted (fastened) to the upper and lower beams 2, 2 (the lowermost is the foundation beam 2a). Members).
[0009]
FIG. 3 is a configuration diagram of the energy absorbing member 5, and FIG. 4 is an enlarged view of a portion where the energy absorbing member 5 is installed.
The energy absorbing member 5 has a vertically symmetrical shape, and has flange portions 5a, 5a at upper and lower ends for bolt connection to the beam 2, and an energy absorbing region 5b is provided at an intermediate portion between them. Is provided. The flange portions 5a and 5a are set to have a maximum width, and the region 5b for absorbing energy is set to have a smaller width. Then, in the region 5b for energy absorption, the contours 5c and 5d of the side edges in the width direction are set so that the horizontal bending stress at the time of plastic deformation in an arbitrary cross section in the height direction becomes substantially constant. Is set.
[0010]
Specifically, as shown in FIG. 3, the profile of the side edge 5c on the pillar side of the energy absorbing member 5 is formed in a straight line, and the side edge 5d on the opposite side (the side facing the center of the opening 3) is formed. The contour is formed as a vertically symmetric curve that is recessed toward the straight line at the center in the height direction. In addition, the curve secures a predetermined width S required for transmitting the shearing stress between the straight line and the straight line at the concave portion 5e at the center in the height direction, and has a parabolic shape convex outwardly above and below the straight line. The region 5f having a parabolic shape is a range where the stress state becomes uniform during plastic deformation. The central concave portion 5e and the connecting portion between the region 5f and the flange 5a are given an appropriate R (curve) so as not to concentrate the stress.
[0011]
The energy absorbing member 5 having such a configuration is arranged along the column 1, and upper and lower flanges 5 a, 5 a are attached to steel brackets 6, 6 provided on the upper and lower beams 2, 2, and joint plates 7. , 7 with bolts. Note that the beam 2 is made of an H-shaped steel, and a reinforcing rib 8 is attached between the upper and lower flanges of the beam 2.
[0012]
In this building 10, since the energy absorbing members 5 are installed in the openings 3 as described above, when each layer of the building 10 is horizontally deformed during an earthquake, the energy absorbing members 5 made of steel plates bend and yield early. To absorb seismic energy. At that time, almost the entire cross section in the height direction of the energy absorbing member 5 is plasticized, so that the energy absorbing efficiency is high. In addition, since the beam 2 is only connected to the beam 2 with bolts, it can be easily replaced when it is excessively damaged.
[0013]
In particular, in the case of the energy absorbing member 5, since the energy absorbing efficiency is high, in a building (for example, a pure ramen structure or the like) in which it is difficult to incorporate the conventional energy absorbing member, the energy absorbing member 5 should be compactly stored near the outer pillar. And the opening 3 is not so narrowed. In addition, since a compact housing can be realized, a large number can be installed, and the energy absorption performance of the entire building can be adjusted by increasing or decreasing the number.
[0014]
【The invention's effect】
As described above, the invention according to claim 1 is characterized in that, in the vicinity of the left and right pillars of the opening surrounded by the left and right pillars and the upper and lower beams, the upper and lower ends extend vertically along the respective pillars. An energy absorbing member joined by a fastening member is provided, and the energy absorbing member is formed of a band-shaped metal plate along the surface of the opening, and a bending stress at the time of plastic deformation at an arbitrary cross section in the height direction is reduced. The profile of the side edges in the width direction is set so that it is almost constant, so that when each layer of the building is horizontally deformed during an earthquake, the energy absorbing member will bend and yield at an early stage to absorb seismic energy. it can. At that time, since substantially the entire cross section in the height direction of the energy absorbing member is plasticized, the energy absorption efficiency is high, and large seismic energy can be absorbed. In addition, since the energy absorption efficiency of each energy absorbing member is high, it can be stored compactly near the pillars on the outer periphery of the building, and the strength at the time of the earthquake can be increased without making the opening on the outer periphery of the building so narrow. Can be. In addition, since compact accommodation is possible, it can be installed from a small opening to a large opening, and the energy absorption performance of the whole building can be adjusted by increasing or decreasing the total number of installations.
Further, in the shape of the energy absorbing member, the profile of the side edge on the pillar side is formed in a straight line, and the profile of the opposite side edge is formed in a vertically symmetric curve recessed on the straight side at the center in the height direction, In addition, since the curve secures a predetermined width required for transmitting shear stress between the straight line and the center in the height direction and has a parabolic shape that is outwardly convex above and below the curved line, the above-described effect is obtained. Can be reliably withdrawn.
[Brief description of the drawings]
FIG. 1 is a front view of an entire building to which an embodiment of the present invention is applied.
FIG. 2 is a plan view of the entire building to which the embodiment of the present invention is applied.
3A and 3B show an energy absorbing member used in the embodiment of the present invention, wherein FIG. 3A is a front view and FIG. 3B is a side view.
FIG. 4 is a partially enlarged view of the embodiment of the present invention.
[Explanation of symbols]
1 pillar 2 beam 3 opening 5 energy absorption member 5c, 5d side edge 10 building

Claims (1)

In the vicinity of the left and right pillars of the opening surrounded by left and right pillars and upper and lower beams, an energy absorbing member extending vertically along each pillar and having upper and lower ends joined to the upper and lower beams by fastening members is provided. The energy absorbing member is formed of a band-shaped metal plate along the surface of the opening, and has a side edge in the width direction such that a bending stress at the time of plastic deformation in an arbitrary cross section in the height direction is substantially constant. Energy absorption structure of a building with a contour
The contour of the side edge on the pillar side of the energy absorbing member is formed as a straight line, and the contour of the opposite side edge is formed as a vertically symmetric curve recessed toward the straight side at the center in the height direction, and the curve The seismic energy absorbing structure of the building , wherein a predetermined width required for shear stress transmission is secured between the straight line at the center in the height direction and a parabolic shape which is outwardly convex at the top and bottom thereof. .

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