JP2017137919A - Flexure yielding type damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexure yielding type damper capable of enhancing the degree-of-freedom and handiness on an installation.SOLUTION: A flexure yielding type damper 1 is constructed of H-shaped steel 3 having flexure yielding type dampers constructed of H-shaped steel 3 formed with bending rigidity reduction parts 2 at the two end portions in the longitudinal direction. Said H-shaped steel 3 is equipped with a reinforcement part 7 for preventing the shearing yield at the end portion of said H-shaped steel 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bending yield type damper, for example, a bending yield type damper used for construction of a damping structure for controlling a building by bending and yielding by receiving a horizontal load generated in the building due to an earthquake.

  Various types of hysteretic dampers have been developed and put into practical use as vibration control means for absorbing seismic energy acting on buildings during an earthquake. Most of them are dampers with shear panels using low-yield-point steel. They are installed between the upper and lower beams of a building, and the shear panels are plasticized by shear deformation and exhibit a damper effect. Such shear panel type dampers include wall type and stud type.

  In the above-mentioned shear panel type damper, it is general to suppress the vertical width (height) of the shear panel as much as possible in order to ensure the occurrence of shear deformation that leads to the achievement of the damper effect. In addition, the joint material for attaching the top and bottom of the shear panel with a small vertical width to the top and bottom beams of the building in this way has high rigidity to keep its deformation small so as not to disturb the stress concentration on the shear panel. A special structure having a sufficiently higher shear strength than the shear panel is required.

  The present invention has been made in consideration of the above-described matters, and an object of the present invention is to provide a bending yield type damper that can increase the degree of freedom and simplicity of installation.

  In order to achieve the above object, a bending yield damper according to the present invention is constituted by an H-shaped steel provided with bending rigidity reducing portions at both ends in the longitudinal direction (Claim 1).

  In the bending yield damper, the H-shaped steel may be provided with a reinforcing portion for preventing shear yielding at the end of the H-shaped steel (Claim 2).

  In this invention, the bending yield type damper which can raise the freedom degree regarding installation or simplicity is obtained.

  That is, the bending yield type damper of the invention according to each claim of the present application is the same hysteretic damper as the conventional shear panel type damper described above, but is a damper that absorbs energy by bending yielding. There is no need to keep the (vertical width) low (small), and the degree of freedom and convenience for installation can be increased accordingly. Further, in the above conventional shear panel type damper, a special structure having high rigidity and shear strength is required, but such a structure is not necessary for installing the bending yield type damper of the present invention. Also in this respect, the degree of freedom and simplicity of installation are increased.

  Further, in the bending yield type damper of the present invention, if the bending rigidity is reduced by the bending rigidity reducing portion and bending yielding is performed with a smaller deformation (suppressing deformation at the time of bending yielding), an early and stable earthquake energy can be obtained. Absorption is not required, and large shear strength is not required.

  In the bending yield type damper according to the second aspect of the present invention, it is possible to prevent the shearing yield from being easily accompanied by the provision of the bending rigidity reducing portion by the reinforcing portion.

(A) is a front view schematically showing a configuration of a bending yield type damper according to an embodiment of the present invention, (B) is an end view of a cut line BB line of (A), (C) is (A) It is a CC line | wire cut part end elevation of FIG. (A) And (D) is the front view and side view which show schematically the structure of the bending yield type damper which concerns on the 2nd Embodiment of this invention, (B) is a BB line cutting | disconnection part of (A). An end view, (C) is an end view of a cut line CC line of (A), and (E) is a side view showing a modification thereof. It is a front view which shows roughly the structure of the bending yield type | mold damper which concerns on the 3rd Embodiment of this invention. It is a front view which shows roughly the structure of the bending yield type | mold damper which concerns on the 4th Embodiment of this invention. (A) And (B) is the front view and side view which show schematically the structure of the bending yield type | mold damper which concerns on the 5th Embodiment of this invention, (C) is a side view which shows the modification. (A) is a front view which shows schematically the structure of the bending yield type damper which concerns on the 6th Embodiment of this invention, (B) is a BB line | wire cut part end elevation of (A), (C) is It is a CC line cutting part end view of (A).

  Embodiments of the present invention will be described below with reference to the drawings.

  A bending yield type damper (hereinafter referred to as a damper) 1 according to the present embodiment is provided, for example, so as to connect the upper and lower beams of a building (directly attached to the upper and lower beams or indirectly through another member. It is used as a hysteresis type vibration control means that absorbs earthquake energy by bending and yielding when a certain level of deformation in the horizontal direction occurs in the building due to the earthquake.

  As shown in FIGS. 1A to 1C, the damper 1 is fixed to both the H-section steel 3 provided with the bending rigidity reducing portions 2 at both ends in the longitudinal direction and the both ends of the H-section steel 3. The damper includes a plate-like base member 4 and uses a strong shaft of the H-section steel 3.

  Here, as shown in FIGS. 1 (A) and 1 (B), the bending rigidity reducing portion 2 is provided on each flange 6 at both ends (end bending yield region) in the longitudinal direction of the web 5 of the H-section steel 3. There are four through-holes that are in contact with each other and are provided at locations that avoid the center of the web 5 in the width direction. In addition, the through-hole which comprises the bending rigidity reduction part 2 may be provided in the position which does not contact the flange 6. FIG.

  The H-section steel 3 is provided with a reinforcing portion 7 for preventing shear yielding at the end of the H-section steel 3. The reinforcing portion 7 is configured by a total of four plates that are in contact with the base member 4 on the front and back sides of the both ends of the web 5 and are welded to a center position in the width direction of the web 5.

  Such a damper 1 is a hysteretic damper that is the same as the conventional shear panel type damper described above, but it is a damper that absorbs energy by bending yielding, and therefore it is necessary to keep its height (vertical width) low (small). Therefore, the degree of freedom and convenience for installation can be increased accordingly. Moreover, in the conventional shear panel type damper, a special structure having high rigidity and shear strength is required, but such a structure is not necessary for installing the damper 1 of the present embodiment. This also increases the degree of freedom and convenience of installation.

  Further, in the damper 1 of the present embodiment, if the bending rigidity is reduced by the bending rigidity reducing unit 2 and bending yielding is performed with a smaller deformation (suppressing deformation during bending yielding), early and stable seismic energy can be obtained. Absorption is not required, and large shear strength is not required.

  Further, the reinforcing portion 7 can prevent the damper 1 of the present embodiment using the H-section steel 3 whose cross section of the web 5 is smaller than that of a normal H-section steel from being easily yielded by shear.

  Here, the rigidity and strength required for the damper 1 can be adjusted by the cross-sectional secondary moment and section modulus, and the material (steel material) is not particularly limited. For example, steel, aluminum, stainless steel, these An alloy of the above can be used. Moreover, although the steel material of the damper 1 may be low yield point steel, for example, ordinary steel (general structural steel material) may be used. In this case, cost reduction can be achieved.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  The damper 1 only needs to have a shape in which the end bending yield region of the H-section steel is processed to reduce bending rigidity and bending yield strength but not to shear yield. For example, the damper 1 can be configured as shown in FIGS. 2A to 2D. That is, the bending rigidity reducing portion 2 shown in FIG. 2A is in contact with the flange 6 at both ends (end bending yield regions) in the longitudinal direction of the web 5 and avoids the center in the width direction of the web 5. 2A (which is smaller than the through-hole 2 shown in FIG. 1 (A)) provided in the place, and a flange 6 provided at a portion corresponding to the through-hole 2A, protruding outward, and a flange 6 and the deformed flange 2B bent so as to be easily deformed in the longitudinal direction. And the effect similar to the damper 1 shown to FIG. 1 (A)-(C) is acquired also by the damper 1 shown to FIG. 2 (A)-(D). Here, in the example shown in FIG. 2D, the lateral width of the deformed flange 2B and the lateral width of the flange 6 are matched, but the lateral width of the deformed flange 2B may be larger than the lateral width of the flange 6, and the required strength. The width of the flange 6 may be smaller than the width of the flange 6 within a range where the above can be obtained. Further, as shown in FIG. 2 (E), the deformation flange 2B may be divided in the lateral width direction, and the number of divisions is not limited to two and may be three or more.

  Moreover, in the example shown to FIG. 1 (A)-(C) and FIG. 2 (A)-(C), although the plate which comprises the reinforcement part 7 is provided in the front and back both surfaces of the web 5, it is not restricted to this, It may be provided only on one side, or the plate constituting the reinforcing portion 7 may be formed separately from the web 5 and fixed to the web 5 by welding or the like. It may be molded.

  In the example shown in FIGS. 2 (A) to 2 (E), the deformed flange 2B is bent in a dogleg shape. However, the present invention is not limited to this. For example, as shown in FIG. It may be formed in an arc shape). Moreover, the deformation flange 2B may be cylindrical, for example, as shown in FIG. 4, or may be cylindrical with a longitudinal section of a rhombus, another polygon, or an ellipse. Good.

  Moreover, although the deformation | transformation flange 2B of FIG. 2 (A)-(D) is bent, as shown to FIG. 5 (A) and (B), the deformation | transformation flange 2B straddles the through-hole 2A up and down. It may be a flat plate extending. In this case, a part of the flange 6 is removed, and the deformed flange 2B is arranged (welded) so as to cover the removed part from the outside, but the cross-sectional area of the deformed flange 2B is the cross-sectional area of the flange 6 In the example shown in FIGS. 5A and 5B, the thicknesses of the deformed flange 2B and the flange 6 are the same, and the lateral width of the deformed flange 2B is smaller. . Here, as shown in FIG. 5C, the deformation flange 2B may be divided in the width direction, and the number of divisions is not limited to two and may be three or more.

  The flat deformed flange 2B shown in FIGS. 5A and 5B is arranged so as to cover the through-hole 2A from the outside, but is not limited to this, for example, as shown in FIGS. 6A to 6C. The flat deformed flange 2B is disposed (welded) on the front and back surfaces of the web 5 at positions corresponding to the inside of the through hole 2A so as to straddle the through hole 2A vertically and is partially H-shaped. A cross section may be formed.

  Needless to say, the modifications described in this specification may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Damper 2 Bending rigidity reduction part 2A Through-hole 2B Deformation flange 3 H-section steel 4 Base member 5 Web 6 Flange 7 Reinforcement part

Claims (2)

  A bending-yield type damper characterized in that it is made of an H-shaped steel provided with bending rigidity reducing portions at both ends in the longitudinal direction.   The bending yield type damper according to claim 1, wherein the H-shaped steel is provided with a reinforcing portion for preventing shear yielding at an end of the H-shaped steel.

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