JP2004308118A - Aseismic structure and aseismic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aseismic structure and an aseismic damper, which prevent damage to a column capital part by preventing an end of a steel material for a damper arm part from being connected to the column capital. <P>SOLUTION: The aseismic structure is constituted by supporting an upper mounted structure 1 with a beam 5 by a column 2 fitted with the aseismic damper; an upper end 4 of a damper part 3, which is constituted by making a plurality of slender steel plates and a plurality of rectangular steel plates alternately face one another and by sandwiching a viscoelastic material layer between the respective steel plates, is mounted on the beam 5 of the structure 1; and a lower end 6 is mounted on the intermediate part of the column 2. This enables effective utilization of a space without closing an interlayer opening part of the structure while preventing the damage to the capital part, and makes an effective seismic response control function exerted even on bending deformation of the structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibration control structure and a vibration control damper, and more particularly to a vibration control structure and a vibration control damper capable of preventing damage to a head of a column joined to a beam of an upper structure.
[0002]
[Prior art]
In order to reduce the response of structures to earthquakes and winds, various types of dampers (energy absorbing mechanisms) are added to the structures to control the vibration. Among them, visco-elastic dampers are used. It uses the viscous resistance of a viscoelastic body against shear deformation while using acrylic rubber, rubber asphalt rubber, high damping rubber, etc. as a viscoelastic material. It is known to exert.
[0003]
However, conventional viscoelastic dampers have a built-in viscoelastic damper installed between columns and beams under elevated tracks in braces, so that the opening of the structure is Because it is blocked by braces, etc. and hinders effective use of space, and it is difficult to exert the seismic control effect against bending deformation of the column base, in the case of a railway viaduct, it is necessary to secure a predetermined strength to the column base. It was necessary to install underground beams, which necessitated a longer construction period and higher construction costs.
[0004]
Therefore, a damper part made of a viscoelastic body made of high damping rubber and steel plates and a damper arm part steel material are used as a capital damper with a damper installed, and the ends of the arm steel material are connected to the capital and the damper is used. When the column is deformed due to an earthquake, the column is transmitted to the damper fixed so as to connect between the capital and the middle of the column, so that the column is fixed to the middle part of the column. Proposals have also been made to reduce the response of the structural part by causing energy absorption by causing shear deformation in the elastic body, and to effectively utilize the space without blocking the opening between the layers of the structure. It also exhibits an effective vibration control function against bending deformation. (For example, see Patent Document 1)
[0005]
As shown in FIG. 6, the vibration damper 40 according to the present proposal has three elongated steel plates 41, 41 ', 41 "facing in parallel and rectangular steel plates 42, 42', 42", 42 "'facing in parallel. Are alternately intersected with each other, and a layer of the viscoelastic body 43 is sandwiched between the layers located between the intersections of the elongated steel plate and the rectangular steel plate. The tip 44 of the elongated steel plate is fixed to the capital 46 of the column 45, and the rectangular steel plate is fixed at a position corresponding to 1/3 to 1/2 of the column length from the capital 46. By doing so, installation of braces (brace) between columns and beams under the overpass is avoided, and space utilization of the structure is aimed at.
[0006]
[Patent Document 1]
JP 2001-57661 A (“paragraph number” 0051 to “paragraph number” 0052, FIG. 10)
[0007]
However, as shown in Fig. 7, since the portion where the plasticity exceeds 6 during the earthquake is the joint between the capital and the upper beam, significant damage is concentrated on the capital and the pedestal. In the case of viaducts, etc., damage is caused between the upper beams and the capitals due to destruction of concrete and removal of column reinforcing bars.
[0008]
Therefore, it has become clear that the proposed capital damping damper, which has the effect of preventing the deformation of the column, has a problem in preventing the damage which is concentrated on the capital.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and proposes to prevent damage that occurs intensively at the capital, in which the end of the steel material of the damper arm is stopped from being coupled to the capital, and thereby the capital at the capital is prevented. We provide damping structures and damping dampers to prevent damage.
[0010]
[Means for Solving the Problems]
The vibration control structure according to claim 1 is a vibration control structure in which an upper structure having a beam is supported by a column to which a vibration control damper is attached, wherein a plurality of elongated steel plates and a rectangular steel plate are provided. And the upper end of the damper part, which is constructed by sandwiching a viscoelastic layer between each steel plate, is attached to the beam of the upper structure, and the lower end is attached to the middle part of the pillar. In addition, the effective use of the space without blocking the opening between the layers of the structure while preventing damage to the capital is achieved, and the effective vibration control function against the bending deformation of the structure is exhibited.
[0011]
The vibration damping structure according to the second aspect of the present invention is characterized in that, in the vibration damping structure according to the first aspect, an attachment portion is formed at an upper end of the damper portion so as to be perpendicular to a shear surface of each steel plate. In addition to the above functions, the mounting of the upper structure to the beam is facilitated.
[0012]
The vibration damping structure according to the third aspect of the present invention is the vibration damping structure according to the first or second aspect, further comprising a reinforcing steel plate perpendicular to a steel plate surface at an upper end of the damper portion. In addition to the function, the upper end of the damper portion is firmly attached to the beam of the upper structure.
[0013]
A vibration control structure according to a fourth aspect of the present invention is the vibration control structure according to any one of the first to third aspects, further comprising a damper mounting portion sandwiching the beam of the upper structure from both sides. In addition to the above functions, the upper end of the damper portion is firmly attached to the beam of the upper structure.
[0014]
A vibration control structure according to a fifth aspect of the present invention is the vibration control structure according to any one of the first to fourth aspects, wherein a band-shaped steel plate is wound around an intermediate portion of a column to which a damper portion is attached. In addition to the above functions, the attachment of the damper to the pillar is facilitated.
[0015]
Further, the vibration damper according to the present invention is configured such that a plurality of elongated steel plates and a rectangular steel plate are alternately opposed to each other, and a viscoelastic layer is interposed between the steel plates to form a damper portion, and the upper end of the elongated steel plate is provided. It is formed by forming a mounting part perpendicular to the shear surface of each steel plate, and is characterized by having a reinforcing steel plate perpendicular to the steel plate surface at the upper end of the elongated steel plate, making it easy to attach the damper part to the beam of the overhanging structure. By effectively utilizing the space without blocking the opening between the layers of the structure, the structure exerts an effective vibration control function against the bending deformation of the structure and prevents damage to the capital.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
In a vibration control structure according to the present invention, a plurality of elongated steel plates and a rectangular steel plate are alternately opposed to each other in a vibration control structure in which an upper structure having a beam is supported by a column to which a vibration damper is attached. At the same time, the upper end of the damper part, which is constructed by sandwiching the viscoelastic layer between the steel plates, is attached to the beam of the upper structure, and the lower end is attached to the middle part of the column. Equipped with a mounting part perpendicular to the shear plane and a reinforcing steel plate perpendicular to the steel plate surface, a damper mounting part sandwiched between the beams of the upper structure from both sides, and winding a strip-shaped steel sheet around the middle part of the column where the damper part is mounted Features.
Hereinafter, an embodiment of a vibration control structure according to the present invention will be described in detail with reference to the drawings.
[0017]
The embodiment shown in FIG. 1 is an example in which a vibration damper 3 is installed between a railway viaduct 1 as an overhead structure and a pier 2 which is a pillar supporting the railway viaduct. In the present embodiment, the upper end 4 of the damping damper 3 is attached to the beam 5 of the viaduct 1 and the lower end 6 is fixed to the intermediate portion of the pier 2, so that the opening between the layers of the structure is not closed. It also exerts an effective vibration control function against bending deformation of objects, and in addition, the railway viaduct 1 can eliminate underground beams of viaducts by preventing damage to the capital 7 of the pier 2 It is also possible to shorten the construction period and reduce construction costs.
[0018]
Incidentally, seismic damping structure according to the present invention, civil engineering structures as long as structures with beams and columns, it is possible to be applied to any structure, including the building structure, high-rise buildings, railroad In addition to viaduct piers, it is possible to impart an effective seismic control effect to structures such as pedestrian bridges, elevated roads, and pedestrian decks without causing damage to the capitals.
[0019]
FIG. 2 shows components that are arranged on the beam 5 of the railway viaduct 1 and the pier 2 that supports the beam 5 in order to install the damping damper 3.
On the beam 5 of the railway viaduct 1, a damper mounting portion 9 is arranged. In order to smoothly transmit stress when attaching the upper end 4 of the vibration damper 3 to the beam 5, the damper mounting portion 9 is equipped with a steel plate so as to sandwich both sides thereof while corresponding to the beam 5. A screw hole 10 to be screwed is provided on the side joined to the upper end 4 of the vibration damper 3, so that the movement of the force is not concentrated only on the lower surface of the beam 5.
[0020]
A strip-shaped steel plate 11 is fixed to the pier 2. The winding position of the strip-shaped steel plate 11 is in a range corresponding to １ ／ to の of the column length, and the screw hole 12 is formed so that the lower end 6 of the vibration damper 3 can be screwed to the strip-shaped steel plate 11. This facilitates the fixing of the vibration damper 3 to the pier 2.
[0021]
The connection between the beam 5 and the damper mounting portion 9, and the bridge pier 2 and the strip-shaped steel plate 11 eliminate the influence of shaking in the bridge axis direction by injecting non-shrinkable mortar or resin into a gap generated therebetween. In order to install the damping damper 3 on the steel plate 9 and the strip-shaped steel plate 11, it is basically screwed and fixed with ordinary bolts.
[0022]
Next, the vibration damper according to the present invention will be described.
The vibration damper according to the present invention is configured such that a plurality of elongated steel plates and rectangular steel plates are alternately opposed to each other, and a viscoelastic layer is sandwiched between the steel plates to form a damper portion. It is characterized in that it is formed by forming a mounting portion perpendicular to the shearing surface of the steel plate, and is provided with a reinforcing steel plate perpendicular to the steel plate surface at the upper end of the elongated steel plate.
Hereinafter, an embodiment of a vibration damper according to the present invention will be described in detail with reference to the drawings.
[0023]
The vibration damper 20 includes three elongated steel plates 21, 21 ′, 21 facing in parallel as shown in the cross-sectional view of FIG. And rectangular steel plates 22, 22 ′, 22 ″, 22 ′ ″ facing each other in parallel in a similar manner, and are alternately layered in a state of intersecting each other, and between each intersection of the elongated steel plate and the rectangular steel plate. The layer of the viscoelastic body 23 is sandwiched between the located multilayer portions.
[0024]
As shown in the perspective view of FIG. 3 (a), the elongated steel plate has a long distal end portion 24 protruding from the layer of the viscoelastic body 23, and the distal end portion 24 has the shape of the railway viaduct 1. In order to be easily screwed to the damper mounting portion 9 provided on the beam 5, the mounting portion 25 is formed by being perpendicular to the shear surface of each elongated steel plate, and the thickness of the steel plate is increased to enhance bending rigidity. That is taken into account.
In addition, in order to strengthen the connection with the elongated steel plates 21, 21 ', 21 ", the mounting portion 25 may be provided with a reinforcing member 26 on the side surface as shown in the figure.
[0025]
Further, when the rectangular steel plates 22, 22 ', 22 ", 22"' are attached to a pier or the like, the elongated steel plates 21, 21 ', 21 "can freely move mutually via the layer of the viscoelastic body 23. As described above, the outer peripheral portions of the rectangular steel plates 22, 22 ', 22 ", 22"' are connected to a pier or the like. Known viscoelastic materials such as rubber, rubber asphalt rubber, and high attenuation rubber are used in the form of a thin plate, and are sandwiched between steel plates by an adhesive or the like as necessary.
[0026]
The damping damper 30 shown in FIG. 4 is another embodiment of the damping damper according to the present invention. The damping damper 30 is an elongated steel plate 21, 21 ′, 21 ″ and a rectangular steel plate 22, 22 ′, 22 ″, 22 ″ ″. The damper portion composed of the viscoelastic body 23 is the same as in the above embodiment.
[0027]
When the vibration damper 30 is provided with reinforcing members 33, 33 on both side surfaces thereof in order to strengthen the connection between the mounting portion 32 formed at the distal end portion 31 thereof and the elongated steel plates 21, 21 ′, 21 ″. At the same time, a reinforcing member 33 'is arranged at the central portion of the mounting portion 32, and furthermore, reinforcing members 34, 34' and 35, which are parallel to the elongated steel plate therebetween, for strengthening the reinforcing members 33, 33 '. 35 'are arranged.
[0028]
The damping damper according to the present invention is configured as in each of the above embodiments, thereby facilitating the attachment of the damper portion to the beam of the overlying structure, and forming a space without blocking the opening between the layers of the structure. While effectively utilizing the structure, it also exerts an effective vibration control function against bending deformation of the structure and prevents damage to the capital.
[0029]
In each of the above embodiments, the vibration damper has been described as a single form. However, the damper mounting portions 9 of the mounting portions 25 and 32 of the vibration dampers 20 and 30 may be integrally provided in advance. By equipping the lower end 6 of the damper 3 with a steel plate corresponding to the strip-shaped steel plate 11 in advance, it is possible to reduce the amount of work at the site as much as possible.
[0030]
FIG. 5 shows verification results of the vibration control structure and the vibration control damper according to the present invention.
[0031]
In this verification, the plasticity of the column of the railway viaduct was confirmed by seismic response analysis, and the plasticity of each element of the column divided into small elements is displayed as the ratio of the maximum response value to the elastic limit.
[0032]
Therefore, the number increases when the deformation is large, but in the conventional example shown in FIG. 7, the plasticity exceeds 6 when the underground beam is provided without the damping damper, In contrast, in the case of the damping structure and the damping damper according to the present invention, the plasticity is substantially equal to about 3 over the entire capital, as shown in the figure, even when there is no underground beam. Numerical values are shown, and it can be confirmed that it functions to suppress damage that occurs at the joint between the upper beam and the capital of the railway viaduct, and to limit the damage to minor damage.
[0033]
As is clear from the above verification, the damping structure and the damping damper according to the present invention are configured as in each of the above embodiments, so that the damper portion can be easily attached to the beam of the upper structure. In order to effectively utilize the space without blocking the opening between the layers of the structure, it also exerts an effective vibration control function against bending deformation of the structure and prevents damage to the capital. Things.
[0034]
As described above, the present invention has been described in detail based on the embodiment. However, the damping structure and the damping damper according to the present invention are not limited to the above-described embodiment at all. civil engineering structures if the structure having a pillar and, in any such structures, including building structures it is possible to apply, ultra-high-rise building, in addition to pedestrian bridge also of the piers of the railway viaduct, flyover, Naturally, various changes can be made without departing from the spirit of the present invention so that the present invention can be applied to structures such as pedestrian decks and the form of the vibration damper is not particularly limited. is there.
[0035]
【The invention's effect】
The vibration damping structure according to claim 1, wherein a plurality of elongated steel plates and rectangular steel plates are alternately provided in a vibration damping structure in which an overlying structure having a beam is supported by a column to which a vibration damper is attached. It is characterized in that the upper end of the damper part, which is constructed by sandwiching a viscoelastic layer between each steel plate, is attached to the beam of the upper structure, and the lower end is attached to the middle part of the column, This has the effect of shortening the construction period and reducing the cost while exhibiting the specific effects of (1).
[0036]
(1) Damage to the capital can be prevented.
{Circle around (2)} The space can be effectively used without blocking the opening between the layers of the structure.
(3) An effective vibration control function can be exerted against bending deformation of structures.
(4) Applicable to seismic reinforcement of existing structures.
[0037]
The vibration damping structure according to claim 2 is characterized in that, in the vibration damping structure according to claim 1, an attachment portion that is perpendicular to a shear surface of each steel plate is formed at an upper end of the damper portion. In addition to the effect, there is an effect that the mounting of the upper structure to the beam can be facilitated.
[0038]
The vibration damping structure according to claim 3 is characterized in that the vibration damping structure according to claim 1 or 2 is provided with a reinforcing steel plate perpendicular to the steel plate surface at the upper end of the damper portion. In addition, there is an effect that the upper end of the damper portion can be firmly attached to the beam of the upper structure.
[0039]
The vibration damping structure according to claim 4 is characterized in that, in the vibration damping structure according to any one of claims 1 to 3, a damper mounting portion sandwiching the beam of the mounting structure from both sides is provided. In addition to the above effects, there is an effect that the upper end of the damper portion can be firmly attached to the beam of the upper structure.
[0040]
The vibration damping structure according to claim 5 is characterized in that, in the vibration damping structure according to any one of claims 1 to 4, a belt-shaped steel plate is wound around an intermediate portion of a column to which a damper portion is attached. In addition to the above effects, the present invention has an effect that the damper can be easily attached to the pillar.
[0041]
Further, the vibration damper according to the present invention is configured such that a plurality of elongated steel plates and a rectangular steel plate are alternately opposed to each other, and a viscoelastic layer is interposed between the steel plates to form a damper portion, and the upper end of the elongated steel plate is provided. Attached to the shear plane of each steel plate, and formed with a reinforcing steel plate perpendicular to the steel plate surface at the upper end of the elongated steel plate, so that it is easy to attach the damper part to the beam of the upper structure In addition, while effectively utilizing the space without blocking the openings between the layers of the structure, it also exerts an effective vibration damping function against bending deformation of the structure and prevents damage to the capital. Is playing.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a vibration control structure according to the present invention; FIG. 2 is an embodiment view showing a damper mounting portion and a strip steel plate of the vibration control structure according to the present invention; FIG. FIG. 4 is a diagram of another embodiment of a vibration damper according to the present invention. FIG. 5 is a verification diagram of a vibration damping structure according to the present invention. FIG. 6 is a diagram of a conventional vibration damping structure. Fig. 7 Plasticity diagram of a conventional damping structure [Explanation of symbols]
1 viaduct, 2 piers, 3, 20, 30, 40 dampers,
4 top, 5 beams, 6 bottom, 7, 46 stigma,
9 Damper mounting part, 10, 12 screw hole, 11 strip steel plate,
21, 41, 21 ', 41', 21 ", 41" slender steel plate,
22, 22 ', 22 ", 22"' rectangular steel plate, 23, 43 viscoelastic body,
24, 31, 44 Tip, 25, 32 Mounting,
33, 33 ', 34, 34', 35, 35 'reinforcing members,
42, 42 ', 42 ", 42"' rectangular steel plate, 45 columns,

Claims (7)

A seismic control structure consisting of an overlying structure with beams supported by columns with damping dampers. A plurality of elongated steel plates and rectangular steel plates are alternately opposed to each other, and the A damping structure having an upper end of a damper portion sandwiching an elastic layer and attached to a beam of an upper structure, and a lower end attached to an intermediate portion of a pillar. The damping structure according to claim 1, wherein an upper end of the damper portion is formed by forming a mounting portion that is perpendicular to a shear surface of each steel plate. 3. The vibration control structure according to claim 1, wherein an upper end of the damper portion is provided with a reinforcing steel plate orthogonal to a steel plate surface. 4. The vibration control structure according to any one of claims 1 to 3, wherein the beam of the upper structure is provided with a damper mounting portion sandwiched from both sides. The vibration control structure according to any one of claims 1 to 4, wherein the column is formed by winding a belt-shaped steel plate around an intermediate portion to which the damper portion is attached. A plurality of elongated steel plates and rectangular steel plates are alternately opposed to each other, and a viscoelastic layer is sandwiched between the steel plates to form a damper part. A vibration damper formed by forming The damper according to claim 6, wherein an upper end of the elongated steel plate is provided with a reinforcing steel plate perpendicular to the steel plate surface.

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