JP6677480B2 - Hysteretic damper and vibration control structure of building - Google Patents

Description

  The present invention relates to a hysteretic damper that is a vibration damping device that absorbs seismic energy applied to a building and thereby reduces the seismic force that the building bears, and a vibration damping structure of a building including the hysteretic damper.

  2. Description of the Related Art For damping a building, a hysteretic damper that absorbs seismic energy by using plastic deformation of a steel material is disposed in a rectangular frame formed by beams and columns of the building. Conventionally, as one of such hysteretic dampers, a damper having two pairs of corners opposed to each other, which is formed of a steel material so as to have a rectangular shape as a whole, has been proposed. This hysteretic damper is arranged on the frame through two pairs of diagonal members fixed to the two pairs of corners, with the two pairs of corners located on two diagonal lines of the building frame, respectively. It is attached.

  In this hysteretic damper, the structure of the frame changes from a rectangle to a parallelogram due to the earthquake of the building, and accordingly, the length of both diagonal lines of the frame changes, thereby receiving a tensile force and a compressive force. At this time, plastic deformation accompanied by a change in angle occurs at the two pairs of corners of the hysteretic damper, thereby absorbing the seismic energy applied to the building.

  Incidentally, the corners of the conventional hysteretic damper are required to have a predetermined rigidity so that the plastic deformation at the corners exhibits a required seismic energy absorbing effect. In a conventional hysteretic damper, a joint for fixing a diagonal member is provided at a corner. Therefore, it is necessary to set the rigidity of the corners for the entire corner including the joint. However, it is difficult to calculate the rigidity of the entire corner including the joint.

JP 2010-95901 A

An object of the present invention is to provide a hysteretic damper having a polygonal shape as a whole and having a plurality of corners , in which the rigidity required for the corners can be easily calculated. An object of the present invention is to provide a damping structure for a building including a damper.

The present invention relates to a hysteretic damper installed in a rectangular frame surface of a building, wherein the hysteretic damper is a flat steel cylinder having a concave hexagonal cross-sectional shape, wherein the concave hexagon is Ru with six sides and six vertices six located respective flat surface portion and the cylindrical body having six folded corners of. The tubular body is disposed between two diagonals arranged along one of two diagonal lines of a rectangle defining the frame surface, and six surface portions of the tubular body are end portions of the two diagonal members. And two sets of other face portions each of which is fixed to the portion, and two other face portions defining the interior angle exceeding 180 degrees of the concave hexagon between the two face portions as one set. Consists of The tubular body is a bent steel strip, which is formed of a steel strip having both end faces abutted and joined to each other, and both end faces of the steel strip are any one of the six corners. Can exist.

The present invention also relates to a damping structure for a building, wherein the damping structure includes a rectangular frame of the building and the hysteretic damper installed on the frame. Preferably, it further includes a pair of viscous dampers. Both viscous dampers are arranged along the other of the two diagonal lines of the rectangle defining the frame surface and between the hysteretic dampers, and one of the other two surface portions of the two sets of the hysteretic dampers And the frame are respectively pin-connected.

  According to the present invention, when a building having a frame in which the hysteretic damper is installed swings in the horizontal direction due to the occurrence of an earthquake, and the shape of the frame changes from a rectangle to a parallelogram, the two diagonal members are used. Thus, the cylindrical body constituting the hysteretic damper alternately receives an external force at its two surface portions to expand and compress the cylindrical body. At this time, plastic deformation accompanied by a change in angle occurs at each corner of the cylindrical body, and the seismic force acting on the building is reduced.

  In the present invention, the cylindrical body constituting the hysteretic damper is fixed to the ends of the two diagonal members on two surface portions thereof, and neither corner is involved in fixing the cylindrical body. From this, the rigidity of the corners required for alleviating the assumed seismic force can be easily set by selecting the thickness, width or type of the steel material constituting the cylindrical body.

  A pair of viscous dampers can be further installed in the frame where the hysteretic dampers are installed. The hysteresis type damper and the viscous type damper may be vibration damping devices that contribute to the mitigation of relatively large seismic force and the mitigation of relatively small seismic force, respectively.

It is a perspective view which shows the frame of a building, the hysteresis type damper installed in the said frame, and a pair of viscous type damper. It is a front view of the frame shown in FIG. 1, a hysteresis type damper, and a pair of viscous type dampers. It is a figure which shows the shape of the frame of a building before and after an earthquake.

  Referring to FIGS. 1 and 2, a hysteretic damper 14 as a vibration damping device and a viscous damper 16 such as a pair of oil dampers are installed in a frame 12 of a building 10.

  The illustrated building 10 includes a pair of left and right reinforced concrete columns 18 constituting the frame 12, and a pair of upper and lower steel beams 20 connected to the pair of columns 18 and extending horizontally between the columns 18. The column 18 may be made of steel frame or steel frame bar instead of the illustrated example in which it is made of reinforced concrete. Similarly, the beam 20 may be made of steel reinforced steel or reinforced concrete instead of the illustrated example in which it is made of steel. The pair of pillars 18 and the pair of beams 20 constituting the frame 12 define a rectangular frame surface 22. The vibration damping device (history damper 14 and viscous damper 16) is used when the building 10 shakes in the horizontal direction due to the seismic force and the shape of the frame surface 22 changes from a rectangle to a parallelogram with this ( It absorbs seismic energy and reduces the seismic force acting on the building 10.

  The hysteretic damper 14 and the pair of viscous dampers 16 form a vibration damping structure 24 of the building 10 together with the frame 12 on which these dampers 14, 16 are installed. However, instead of the illustrated example, the vibration damping device constituting the vibration damping structure 24 may include only the hysteretic damper 14 without the pair of viscous dampers 16.

  The hysteretic damper 14 includes a flat cylindrical body 26 made of steel. The hysteretic damper 14 is disposed in the frame 12 such that the axis of the cylindrical body 26 is orthogonal to the frame surface 22. The tubular body 26 preferably has an axial length substantially equal to the thickness dimension of the beam 20, in the example shown, the width dimension of the flange of the H-section steel constituting the beam 20.

  The illustrated cylindrical body 26 has a hexagonal cross-sectional shape having six sides and vertices that are one of the polygons, and flat surface portions 26a, 26b, and 26c located on each side of the hexagon, It has bent corners 26d and 26e located at each vertex of the hexagon.

  In the illustrated example, the hexagon is a concave hexagon that is one of concave polygons having at least one interior angle greater than 180 degrees. This concave hexagon has two equal-length sides (surface portion 26a) opposed to each other and parallel to each other, and an equi-length portion which is bent between the two sides in the shape of a triangle and is continuous with the two sides (surface portion 26a). And two pairs of two sides (the surface portion 26b and the surface portion 26c) as one set. The two sides and the two sides of both sets each define the interior angle (corner 26d) within 180 degrees, and the two sides of each set each define the interior angle (corner 26e) exceeding 180 degrees. . In the illustrated example, one of the two sides (the surface portion 26b) and the other (the surface portion 26c) are parallel to each other. In the illustrated example, each of the two parallel sides (surface portions 26a) has a length dimension larger than each side (surface portions 26b and 26c) of each set.

  The cylindrical body 26 forms corner portions 26d and 26e and surface portions 26a, 26b and 26c by bending a steel strip (not shown), and thereafter, both ends of the steel strip. It can be formed by butt welding the surfaces together and joining them together. Here, the welding generally increases the stiffness of a portion to be joined by the welding. For this reason, the position of both end surfaces (butting surfaces) of the strip steel pieces butting each other is not at the corners 26d and 26e, but between the corners 26d and 26d or between the corners 26d and 26e. I do. Thereby, the rigidity of all the corner portions 26d and 26e can be made uniform from the steel strip.

  1 and 2, the corners 26d and 26e of the cylindrical body 26 are drawn as straight lines on the inner surface and the outer surface of the cylindrical body 26 for convenience of illustration. However, since each corner 26d and 26e of the cylindrical body 26 is bent, it actually exhibits a curved surface.

In addition , the length of the side and the size of the apex angle of the hexagon can be arbitrarily determined .

  The cylindrical body 26 constituting the hysteretic damper 14 is fixed to the frame 12 via two diagonal members 28. More specifically, the cylindrical body 26 is disposed between two diagonal members 28 disposed along one of two rectangular diagonal lines 22 a and 22 b (FIG. 3) that define the frame surface 22. It is fixed to each end 28a (FIG. 2) of each diagonal member 28 at an arbitrary position on each surface 26a of the body 26, preferably at a center position between two corners 26d connected to each surface 26a. The other end 28b of each diagonal member 28 is fixed to the frame 12 at the intersection of the column 18 and the beam 20 which constitute the frame 12.

  In the illustrated example, each diagonal member 28 is made of an H-section steel, the H-section steel having an end surface perpendicular to an axis extending in the longitudinal direction thereof, and a flat surface of the cylindrical body 26 at the end surface. It is in contact with the surface 26a. However, depending on the cross-sectional shape of the cylinder 26, the end surface of the diagonal member 28 that is in contact with the surface of the cylinder may be non-perpendicular to the axis of the diagonal member. In addition, the diagonal member 28 can be made of a shaped steel other than the H-shaped steel or another long material. In addition, the H-shaped steel constituting the diagonal member 28 has a width dimension smaller than the axial length of the cylindrical body 26.

  Prior to installing the hysteretic damper 14 in the frame 12, the two diagonal members 28 can be fixed to both side portions 26 a of the cylindrical body 26, respectively. The diagonal member 28 may be fixed to the surface portion 26a by welding them or a joint (not shown) is fixed to the surface portion 26a in advance, and the joint and the end portion 28a of the diagonal member 28 are connected in a plurality of pairs. It can be performed by fixing with bolts and nuts (not shown).

  When the building 10 shakes horizontally in the horizontal direction under the seismic force, the shape of the frame 12 or the frame surface 22 changes from a rectangle to a parallelogram, and the length of the two diagonal lines 22a and 22b of the frame surface 22 is accordingly changed. Extend and shorten (see FIG. 3). At this time, the cylindrical body 26 constituting the hysteretic damper 14 receives the tensile force and the compressive force from the frame 12 alternately on the two surface portions 26a fixed to the two diagonal members 28, respectively. It is alternately stretched and compressed in the direction of extension of the diagonal 22a. At the same time, plastic deformation accompanied by a change in angle occurs at each corner 26d, 26e of the cylindrical body 26. Specifically, when the cylindrical body 26 is extended, plastic deformation occurs in the cylindrical body 26 in which the size of the inner angle of the corner 26d gradually increases and the size of the inner angle of the corner 26e gradually decreases. Conversely, when the cylindrical body 26 is compressed and contracted, plastic deformation occurs in which the size of the inner angle of the corner 26d gradually decreases and the size of the inner angle of the corner 26e gradually increases. As a result, the seismic energy acting on the building 10 is absorbed, and the seismic force that the building 10 bears is reduced.

  The degree or size of the rigidity of each corner 26d, 26e of the cylindrical body 26 of the hysteretic damper 14 can be arbitrarily and easily determined by selecting the thickness, width, or type (steel type) of the strip. Can be. The degree or magnitude of the rigidity of each of the corners 26d and 26e of the cylindrical body 26 is determined in consideration of the degree of the plastic deformation that is effective in reducing the seismic force of an assumed scale. Each of the surface portions 26a, 26b, 26c of the cylindrical body 26 has such a rigidity that when the cylindrical body 26 is stretched and contracted in the direction of extension of one of the diagonal lines 22a, there is almost no bending. The stiffness of each surface portion 26a, 26b, 26c can also be appropriately determined based on the thickness, width, or type (steel type) of the steel strip, together with the stiffness of the corner portion.

  A pair of viscous dampers 16 installed in the frame 12 together with the hysteretic damper 14 are provided along the other diagonal line 22b of the two rectangular diagonals 22a and 22b defining the frame surface 22 and the hysteretic damper 14. And two other surface parts other than the two surface parts 26a of the cylindrical body 26 of the hysteretic damper 14, and in the example shown in the drawing, two surface parts 26b parallel to each other, and constitute the frame 12. Pins 30 are connected to the intersections of the columns 18 and the beams 20 (specifically, gusset plates 32 fixed to the intersections) by pins 30.

  Due to the earthquake, the building 10 sways horizontally from side to side, so that the shape of the frame surface 22 changes from a rectangle to a parallelogram, and the length of the other diagonal line 22b of the frame surface 22 alternates with this. When shortening and extending (see FIG. 3), both viscous dampers 16 receive alternating compressive and tensile forces. At this time, the viscous damper 16 has a function of reducing the degree of shape change of the frame 12 by its vibration damping function.

  When the earthquake is of a relatively large scale that causes the hysteretic damper 14 to undergo the plastic deformation, the viscous damper 16 cooperates with the hysteretic damper 14 to reduce the seismic force acting on the building 10. To contribute. Conversely, when the earthquake is of a relatively small scale that causes the hysteretic damper 14 to undergo elastic deformation instead of the plastic deformation, the action of the two-viscosity damper 16 mainly reduces the seismic force acting on the building 10. Contributes to mitigation.

DESCRIPTION OF SYMBOLS 10 Building 12 Frame 14 Hysteresis damper 16 Viscous damper 18 Column 20 Beam 22 Frame surface 24 Damping structure 26 Cylindrical body 26a, 26b, 26c Cylindrical surface part 26d, 26e Cylindrical corner part 28 Diagonal material 28a One end

Claims (4)

A hysteretic damper installed in a rectangular frame of a building,
Having six flat surface portions and six folded corners a flat cylindrical body of steel respectively located six sides and six vertices of the concave hexagon with concave hexagonal cross-sectional shape Equipped with a cylinder,
The cylinder is disposed between two diagonal members disposed along one of two diagonal lines of a rectangle defining the frame surface,
The six surface portions of the cylindrical body are two surface portions facing each other fixed to the ends of the two diagonal members, respectively, and define an interior angle of the concave hexagon exceeding 180 degrees between the two surface portions. A hysteretic damper comprising two sets of other face parts, each of which has two face parts as one set . The tubular body is a bent steel strip, which is formed of a steel strip having both end faces abutted and joined to each other, and both end faces of the steel strip are any one of the six corners. The hysteretic damper according to claim 1, wherein A rectangular frame,
A damping structure for a building, comprising the hysteretic damper according to claim 1 or 2 installed on the frame. In addition, it includes a pair of viscous dampers,
Both viscous dampers are arranged along the other of the two diagonal lines of the rectangle defining the frame surface and between the hysteretic dampers, and one of the other two surface portions of the two sets of the hysteretic dampers The building vibration damping structure according to claim 3, wherein the vibration damping structure is connected to the frame and the frame by pins.

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