JP2001182359A - Earthquake-resistant brace device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a repair work to improve an earthquake resisting performance for a small-scale existing building at a low cost by effectively damping earthquake energy without applying an excessive axial force to a column at a low cost. SOLUTION: Inside a structural framing 5 constituted with columns 1, 2 and beams 3, 4, two dampers 7, 7' are cramped in a mutually intersecting shape as braces interposed as visco-elasticity bodies 10 between mutually rigid plate members 9A, 9B, and cushion members 8 consisting of high damping rubber, visco-elasticity bodies and low friction resin materials are interposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to seismic resistance applied to a middle-to-high-rise building made of reinforced concrete (RC) or steel frame (S), or a building for a wooden detached house, to prevent wind sway or to reinforce against an earthquake. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace device which is suitable for seismic retrofitting of an existing building.

[0002]

2. Description of the Related Art As means for improving the seismic performance of a building, it is common to use, for example, a seismic isolation device using a laminated rubber or a combination of a laminated rubber and a damper, or a passive or active vibration control device. However, in this case, the scale of the equipment is very large and requires a very large installation space, and the cost burden on construction is very large. Is virtually impossible to apply.

Therefore, as a seismic retrofitting means which can be easily applied to an existing building without using a large-scale and large-cost seismic isolation device or a vibration control device, columns and beams constituting a structural frame of a building are used. Braces and fire beams, between the joints with
2. Description of the Related Art Conventionally, means for reinforcing a building such as an external frame at an angle to enhance the strength of a building, and improving the toughness of a building by shear reinforcement of columns have been employed.

[0004]

However, the conventional seismic retrofitting means as described above is an earthquake-resistant reinforcement by increasing the strength of the entire building accompanying the reinforcement of the joints in the structural frame, and is input to the frame during an earthquake. Since it does not have the damping performance of absorbing and reducing the energy that occurs, in the event of a large earthquake exceeding the design strength, the reinforcing members such as bracing will first yield and break or be damaged, even if the entire building is damaged. Even if it does not collapse, once the reinforcing member has been broken or damaged, the original seismic reinforcing effect of the entire building cannot be maintained unless the reinforcing member is replaced.

[0005] In particular, when an existing building is simply rehabilitated with the above-mentioned seismic retrofit, a large axial force is applied to the columns of the structural frame when an earthquake occurs, and the large axial force is applied to the initial design of the building. In the event that a strong foundation cannot be borne, a large earthquake that exceeds the basic design strength of the building at the time of the initial construction will result in the failure of the foundation under the influence of a large axial force. There was a problem that the seismic performance could not be exerted and the effect of the seismic retrofit was not at all or very small.

[0006] The present invention has been made in view of the above-mentioned circumstances, and is small-sized, has a small cost burden, can be easily applied to seismic retrofitting of existing buildings, and has an excessively large shaft. It is an object of the present invention to provide a seismic brace device capable of effectively attenuating seismic energy without exerting force and significantly improving seismic performance even in an existing building.

[0007]

In order to achieve the above object, an earthquake-resistant brace device according to the present invention includes a viscoelastic material between rigid plates parallel to each other in a structural frame composed of columns and beams. The two damping dampers having a body interposed therebetween are arranged in a crossed manner as braces.

According to the present invention having the above structure, the hysteresis characteristic of the elliptic loop and the speed-dependent damping characteristic as shown in FIG. Two types of vibration dampers using a viscoelastic body that can absorb energy effectively from a large deformation to a large deformation, and have the property of restoring the original hysteresis characteristics within several hours even if broken once Since they are arranged as braces in an intersecting manner, they not only provide seismic strengthening of the structural framework, and thus the entire building, but also provide a damping property to the building due to the shear deformation of the viscoelastic body during an earthquake to reduce the seismic energy. It is possible to absorb it, thereby improving the seismic performance of the entire building, even though it is a small-scale construction with a small cost of a brace frame. In particular, since the axial force applied to the columns of the structural frame can be kept very small even in the event of a major earthquake, the axial force applied to the columns during an earthquake can be reduced even when applied to the seismic retrofitting of existing buildings. It is possible to exhibit the required seismic retrofit effect by making it possible to sufficiently bear and respond to the foundation with the initial design strength.

In the seismic brace having the above-mentioned structure, as described in claim 2, by adopting a structure in which a cushioning material is interposed between the central intersections of two vibration dampers arranged so as to intersect with each other, It is possible to prevent the two damping dampers from colliding with each other during an earthquake, and to prevent the rigid plates of both dampers from rubbing against each other and causing friction therebetween, thereby reducing the arrangement interval between the two damping dampers. This facilitates construction and does not impair the function of each of the dampers arranged in a crossing manner, thereby increasing the energy absorption capacity and further improving the seismic performance.

When a single-layer or multi-layer high-damping rubber or a viscoelastic material is used as the cushioning material, the damping material may be used in addition to the energy absorbing function of the two vibration dampers. The energy absorption function of the cushioning material is also exhibited to further improve the seismic performance.

Further, when a low-friction resin material, for example, a tetrafluoride resin material is used as the cushioning material, the rigid plate materials of both vibration dampers are brought into contact with each other. Even if the interval between the two damping dampers is minimized, the functions of the two damping dampers are not impaired by friction at all, and both dampers can function normally and reliably.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a state in which an anti-seismic brace device according to the present invention is applied to an existing building, and FIG. 2 is a plan view thereof. Two pillars 1 and 2
The beams 3 and 4 are fixedly joined to each other between the upper portion and the lower portion, thereby forming the structural skeleton 5 of the existing building.

The two pillars 1 constituting the structural frame 5
Gusset plates 6 are welded and fixed to the inner corners of the joints between the upper end 2 and the upper beam 3 and the joints between the lower ends of the columns 1 and 2 and the lower beam 4. Two damping dampers 7, 7 are provided between two sets of gusset plates 6, 6 which are diagonally opposed to each other.
′ Are arranged as a brace so as to intersect with each other, and the damping material 8 is interposed between the central intersections of the two vibration dampers 7 and 7 ′, thereby forming the brace device A for earthquake resistance. .

As shown in FIG. 2, each of the two vibration dampers 7 and 7 'of the seismic brace device A has one longitudinal end fixed to the gusset plate 6 and the other end obliquely downward and obliquely upward. A pair of strip-shaped rigid plate members 9A and 9B, such as a pair of metal plates, which extend and are opposed to each other in an appropriate length range along the axial direction in a parallel state, and a pair of rigid plate members 9A and 9B.
9B and a viscoelastic body 10 interposed between the opposing surfaces 9B. The viscoelastic bodies 10, 10 in these vibration dampers 7, 7 'are made of an acrylic polymer material or a rubber polymer material, and have mechanical behavior having both fluid-like viscosity and spring-like elasticity. And has a hysteresis characteristic and a speed-dependent attenuation characteristic as shown in FIG.

Further, a cushioning material 8 interposed between the central intersections of the two vibration dampers 7, 7 'of the seismic brace device A.
A high-damping rubber 8a having a single-layer structure as shown in FIG. 3 is provided between opposing outer surfaces of one rigid plate 9A of one vibration damper 7 and one rigid plate 9B of the other vibration damper 7 '. Alternatively, as shown in FIG. 4, a multi-layered high-attenuation rubber 8a having a rigid plate 11 interposed in the middle portion of its thickness is used, and both surfaces thereof are adhered and fixed to rigid plate materials 9A and 9B.

In an existing building subjected to seismic retrofitting with the above-described seismic brace device A, two damping dampers 7, 7 which are arranged as braces in the structural frame 5 in an intersecting manner. ', The structural frame 5,
As a result, not only can the entire building be seismically reinforced, but also the seismic energy input to the structural frame 5 due to the occurrence of an earthquake or the like can be transmitted to the viscoelastic bodies 10, 10 of the two vibration dampers 7, 7 '. It is possible to impart damping properties to the entire building by absorbing the shear deformation. In particular, since the axial force applied to the columns 1 and 2 of the structural frame 5 during an earthquake can be extremely small, the foundation having the original design strength of the existing building is destroyed by the large axial force. The required seismic retrofit effect can be sufficiently achieved without any damage.

Therefore, the seismic performance of the entire building can be improved while being a small-scale and economical construction with a small cost of the brace frame, and is particularly effectively applied to the seismic retrofitting of an existing building. can do.

In addition, a high damping rubber 8a having a single-layer structure or a multi-layer structure is provided between the center intersections of the two vibration dampers 7, 7 'which are arranged crossing each other in the structural frame 5. Since it is interposed as the material 8, the two damping dampers 7, 7 'are prevented from colliding with each other during an earthquake, and the functions of both damping dampers 7, 7', that is, the energy absorbing function are sufficiently provided. Together with the energy absorption function of the cushioning material 8 itself, the seismic performance of the building can be further improved.

In the above embodiment, the single-layer or multi-layer high-damping rubber 8a is used as the cushioning material 8 interposed between the central intersections of the two vibration dampers 7, 7 '. Instead, a viscoelastic body 8b having a single-layer structure as shown in FIG. 5 or a multilayer structure as shown in FIG.
A configuration in which both surfaces are adhered to the rigid plate members 9A and 9B may be adopted.

As shown in FIG. 7, a low-friction resin material 8c such as a tetrafluoride resin material is used as the cushioning material 8, and the low-friction resin materials 8c are arranged in a crossed manner. Of the damping dampers 7 and 7 ′, one of the damping dampers 7 is attached and fixed to the rigid plate 9 </ b> A, and the other damping damper 7.
The structure in which the rigid plate material 9B of the '′ is brought into contact with the low friction resin material 8c may be adopted. In this case, the function of the two vibration dampers 7, 7 'is not impaired by friction at all while minimizing the arrangement interval between the two vibration dampers 7, 7'. It can function normally and reliably.

Furthermore, in the above-described embodiment, a description has been given of an example in which the present invention is applied to seismic retrofitting of an existing building. However, a newly constructed reinforced concrete (RC) structure, a steel frame (S) structure,
Alternatively, it is needless to say that a similar seismic effect can be obtained even when applied to the prevention of wind sway of a wooden detached house building or the reinforcement against an earthquake.

[0022]

As described above, according to the present invention, it has a hysteresis characteristic of an elliptic loop and a speed-dependent damping characteristic, and has a stable and effective energy absorbing ability from a small deformation to a large deformation. By incorporating two damping dampers using a viscoelastic material with unique properties in a structural frame so that they intersect each other, a small-scale, low-cost construction called a bracing In addition to the seismic reinforcement of the frame, and thus of the entire building, it is possible to impart a damping property to the building by the shear deformation of the viscoelastic body during an earthquake and to sufficiently absorb the seismic energy. In particular, since the axial force applied to the columns of the structural frame during a large earthquake can be kept very small, the axial force applied to the columns during an earthquake can be reduced to the initial design value even when applied to seismic retrofitting of existing buildings. It is possible to sufficiently bear and respond to the strength of the foundation having strength, and it is possible to effectively apply to seismic retrofitting to improve the seismic performance of existing buildings in high demand.

Further, by adopting the configuration as described in the second to fourth aspects, the two damping dampers may collide with each other during an earthquake, or the rigid plates of both dampers may rub against each other to cause friction between the two. Can be prevented, thereby reducing the distance between the two dampers and facilitating construction, while maintaining the function of the two dampers arranged in a cross shape and improving the energy absorption capacity. It can be maximized to further improve the seismic performance.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which an earthquake-resistant brace device according to the present invention is applied to an existing building.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part showing an example of a cushioning material used in the seismic brace device.

FIG. 4 is an enlarged cross-sectional view of a main part showing a modification of the cushioning member.

FIG. 5 is an enlarged cross-sectional view of a main part showing another example of the cushioning material used by the seismic brace device.

FIG. 6 is an enlarged cross-sectional view of a main part showing a modification of the cushioning material.

FIG. 7 is an enlarged cross-sectional view of a main part showing another example of the cushioning material used by the seismic brace device.

FIG. 8 is a graph illustrating hysteresis characteristics of a viscoelastic body.

[Explanation of symbols]

 1, 2 pillar 3, 4 beam 5 structural frame 7, 7 'damping damper 8 cushioning material 8a high damping rubber 8b viscoelastic body 8c low friction resin material 9A, 9B rigid plate material 10 viscoelastic body

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 7/00 F16F 7/00 F 15/02 15/02 E (72) Inventor Kazuaki Mitsunari Hyogo 12-20 Ikeda-cho, Nishinomiya-shi Arai-gumi Co., Ltd. (72) Inventor Kenji Higashi 12-20 Ikeda-cho, Nishinomiya-shi, Hyogo Arai-gumi Co., Ltd. (72) Inventor Shoshiro Fuchikawa Minami-Aoyama, Minato-ku, Tokyo 1-2-6 Nissan Construction Co., Ltd. (72) Inventor Mutsumi Nakade 1-2-6 Minami Aoyama, Minato-ku, Tokyo Nissan Construction Co., Ltd. (72) Inventor Toshiyuki Kami Nishi-ku, Osaka, Osaka 1-17-18 Edobori Toyo Tire & Rubber Co., Ltd. (72) Inventor Takayuki Wakai 1-17-18 Edobori Nishi-ku Osaka-shi, Osaka F-term in Toyo Tire & Rubber Co., Ltd. LB09 LB12 LC 06 MA11 MA12 2E125 AA04 AA14 AB12 AC01 AC14 AC23 AG57 BB03 BB08 BB22 BC09 BD01 BD06 BE01 BF06 BF08 CA05 CA14 CA81 2E176 AA01 AA07 AA09 BB28 3J048 AA01 BA24 BD08 EA38 3J066 AA30 BA01 BC05 BE06

Claims (4)

[Claims] 1. A vibration damper having a viscoelastic body interposed between rigid plate members parallel to each other is arranged in a cross-shaped manner in a structural frame composed of columns and beams. An anti-seismic brace device, characterized in that: 2. The seismic brace device according to claim 1, wherein a cushioning material is interposed between the central intersections of the two vibration dampers arranged as intersecting braces. 3. The seismic brace device according to claim 2, wherein the cushioning member is a high-damping rubber or a viscoelastic body having a single-layer or multi-layer structure. 4. The seismic brace device according to claim 2, wherein the cushioning material is a low friction resin material.