JPH1018637A - Vibration control construction of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to display high vibration controllability at a low installation cost by installing splice plates along the ends of first and second frame constituent materials to fix, and making a joint section between at least one of the ends and splice plates as a damper. SOLUTION: In a joint section between end member 3 as a first constituent material and central member 4 as a second constituent material, splice plates 9 are arranged along end member flanges 5 and central member flanges 7, and splice plates 10 are arranged along end member webs 6 and central member webs 8. Filler plates 11 are arranged between the splice plates 9 and end member flanges 5, and damper constituent material is provided between the splice plates 9 and central member flanges 7. When bending stress acting on the central members 4 reaches specific bending stress, the friction surface is formed between the splice plates 9 and damper constituent material 12 to generate sliding, and it functions so that deformation can be allowed by bending of the central member 4, and the effect of the damper is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control structure for a building installed on a building to improve seismic performance.

[0002]

2. Description of the Related Art In recent years, a building employing a damping structure has been constructed in order to suppress or control the response of the building to vibration such as seismic force acting on the building. It has become to. As a typical example of such a vibration damping structure, there is one that absorbs vibration energy of an earthquake with a damper to reduce the vibration of a building.
These dampers are generally installed between a wall and a column or a beam, on a wall, a part of a column or a brace, or the like.

[0003]

However, when the damper is to be installed in a part of a building as described above, there are cases where the installation plan is restricted depending on the installation location. In addition, such as the cost required for installing these dampers and the cost required for maintenance after installation,
There was a problem in terms of cost. From such a thing,
There has been a demand for a vibration damping structure that does not restrict the architectural plan, is relatively easy to install and maintain, and does not cost much.

In view of the above circumstances, the building vibration damping structure of the present invention can be installed with almost the same appearance and procedure as a conventional building without a general vibration damping structure. , The installation cost is relatively cheap,
It is another object of the present invention to provide a vibration damping structure for a building in which maintenance after installation is easy.

[0005]

In order to solve the above-mentioned problems, the following means have been adopted in the building vibration control structure of the present invention. That is, the vibration damping structure for a building according to claim 1 is a vibration damping structure for a building provided on a pillar or a beam of the building, wherein at least a part of the pillar or the beam is formed, and one end of each of the pillars or the beam is provided. A first frame component and a second frame component butted against each other, and an attachment plate disposed along ends of the first frame component and the second frame component and fixed thereto; And a coupling portion between at least one of the end portions and the attachment plate is configured as a damper.

[0006] In this vibration damping structure of a building, when a beam or a column is formed by connecting a plurality of frame components, a damper is interposed between connecting portions of the frame components to control the damper. This forms a vibration structure. Specifically, the joint between the attachment plate and the frame component arranged along the seam of the two frame components is configured as a damper, and when a bending stress acts on the frame component during an earthquake, this A damper absorbs the vibration energy of the earthquake and controls the vibration in the building. Also,
This vibration damping structure of a building can be installed in a frame of a building in which a frame member constituting a beam or a column such as a steel frame has a joint, and the joint is joined by an attachment plate.

According to a second aspect of the present invention, there is provided a vibration damping structure for a building according to the first aspect, wherein the first frame member is fixed to a column or a beam. Wherein the second frame component is composed of a central member arranged in the middle of the end member. In the vibration damping structure of this building, when the central member and a pair of end members joined to both ends constitute part or all of beams, columns, etc. as frame constituent members, the central member A damper is provided at a joint between the pair of end members. At this time, a damper is provided at a joint between the attachment plate arranged for joining the center member and the end member and at least one of the center member and the end member. This vibration damping structure of a building can be applied, for example, to a steel-framed building in which columns or beams are constituted by a steel frame and brackets joined to both ends thereof.

According to a third aspect of the present invention, there is provided a vibration damping structure for a building according to the first or second aspect, wherein a damper component is interposed in the connecting portion configured as the damper. It is characterized by that. In this vibration damping structure of a building, a damper is configured by interposing a damper component between a supporting plate and a frame component. For this reason, in a normal steel frame composed of connecting parts by connecting the frame components with the attachment plate, a damper component is used instead of the filler plate interposed between the attachment plate and the frame component. It can be installed by using. Also, in this case, the construction procedure for installation and the appearance after installation can be made almost the same as the case of constructing a general building without such a vibration damping structure.

According to a fourth aspect of the present invention, there is provided a vibration damping structure for a building according to the first, second or third aspect, wherein the damper is a friction damper. In this structure, the damper is configured as a friction damper. Since this damper is formed as a slip surface using a friction material, it can be formed in a planar shape, and is suitable as a damper arranged between the attachment plate and the frame component as described above. is there. In addition, when a bending stress is applied to the frame components during an earthquake or the like, slippage is allowed on this friction surface, so that the joint between the frame components can exhibit a damper effect while being rotationally deformed. It is. Further, in the vibration damping structure of this building, there is almost no deterioration such as cumulative plastic strain and steel fatigue as compared with the case where a hysteretic damper component using steel or the like is used.

According to a fifth aspect of the present invention, there is provided a vibration damping structure for a building according to the first, second or third aspect, wherein the damper is configured as a viscoelastic damper. I do. In the vibration damping structure of this building, since the damper is configured as a viscoelastic damper, for example,
Compared to the case of using a hysteresis damper using steel, etc., not only is there little degradation such as cumulative plastic strain or steel fatigue, but the entire damper can be made relatively compact and have a high energy decay rate. In addition, vibration can be effectively reduced even in the case of a wind or a small or medium-sized earthquake.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a column constituting a building, and 2 denotes a beam erected between the columns 1. Beam 2
It is composed of a pair of end members 3 connected to a pillar which is a first frame component, and a center member 4 which is a second frame component disposed in the middle of the end members 3. The end member 3 and the center member 4 are both steel frames made of H-section steel. The end member 3 is constituted by an end member flange 5 and an end member web 6, and the center member 4 is constituted by a center member flange 7 and a center member web 8. ing. The end member 3 is fixed to the pillar 1 by welding. At the joint between the end member 3 and the center member 4, a splice plate 9 is disposed along the end member flange 5 and the center member flange 7, and a splice plate 10 is disposed along the end member web 6 and the center member web 8, Each plays a role of joining the end member 3 and the center member 4.

FIG. 2 is an enlarged cross-sectional view of a joint portion formed by the end member flange 5, the center member flange 7, and the attachment plate 9. Between the attachment plate 9 and the end member flange 5,
A steel filler plate 11 is arranged, and a damper component 12 is interposed between the attachment plate 9 and the center material flange 7. End member flange 5, filler plate 11,
The supporting plate 9, the center member flange 7, the damper component 12, and the supporting plate 9 are each provided with a high-strength bolt 1 as shown in the drawing.
3 and fastened together. The hole for inserting the high-strength bolt 13 provided on the center member flange 7 side of the attachment plate 9 is a loose hole 14, and the fastening position of the high-strength bolt 13 when viewed from the attachment plate 9 is 4 so as to be slidable in the axial direction. On the other hand, the damper constituent material 12 is composed of a sliding plate that has been subjected to a surface treatment for stabilizing the slip resistance and improving the durability for the friction damper, and is compressed between the supporting plate 9 by the high-strength bolt 13. A force is applied to ensure a predetermined frictional force. When a force greater than the predetermined frictional force is applied in the direction of arrow A, the damper component 12 and the attachment plate 9
Is a sliding surface, so that the damper component 12 and the center member 4 can slide with respect to the attachment plate 9 in the direction indicated by the arrow A.

Next, the operation of the embodiment having the above-described configuration will be described. In the event of an earthquake, a bending stress acts on the beam 2, but at this time, the central member 4 tends to bend and deform. For this reason, at the end of the central member 4, a force is exerted on the central member flange 7 so as to be displaced in the direction indicated by the arrow A. At this time, if any of the center member flanges 7 is rigidly connected to the end member 3, this displacement is restricted, but in the vibration damping structure of the building according to the present embodiment, the attachment plate 9 is used. When the bending stress acting on the center member 4 reaches a predetermined bending stress, the damper component 12 is interposed between the damper component 12 and the center member flange 7. The gap serves as a friction surface, causing slippage, and functions to allow deformation of the central member 4 due to bending. Therefore, the room where the center member 4 bends and elastically deforms so that the assumption of plane holding is satisfied is larger than that in the case of the rigid joint.

The effect of increasing the room for the central member 4 to elastically deform is particularly remarkable at the end of the central member 4. In general, when a beam rigidly connected at both ends is subjected to bending stress, the end first yields and plastic deformation occurs. For this reason, for example, when H-shaped steel or the like is used as a building material, the yielded end is not so brittle that it can be deformed while maintaining the state of the plastic hinge, so that it has a large thickness. Regulations on the ratio have been established. However, by adopting the vibration damping structure of the building as in the present embodiment to the rigid joints of the steel members constituting the beams of the building, there is more room for the beam ends to be elastically deformed. Generation of a plastic hinge can be prevented. Therefore, it is only necessary to apply the allowable stress design considering only the elastic deformation of the beam member, and it is not necessary to apply the regulation of the width-thickness ratio to the beam member, and the cost of the beam member can be reduced.

As described above, the vibration damping structure of a building according to the present embodiment allows a slippage in comparison with a conventional method of joining a beam and a column by only rigid joining and pin joining. This adopts a semi-rigid joining method. That is, since the sliding surface is provided between the attachment plate 9 and the damper component 12, the rotation restraining force of the end member 3 as viewed from the center member 4 is reduced as compared with the case of rigid joining, and the center member 4 and the end member The joint of the member 3 itself absorbs seismic energy while rotating and deforming, and exhibits a damper effect.

FIG. 3 shows the relationship between the bending moment M and the rotation angle φ at the joint between the central member 4 and the end member 3 to explain the vibration damping effect in the present embodiment, and the joint is rigid. This is a comparison between the case of joining and the case of pin joining. In the figure, the vertical axis of each graph represents the value of the bending moment M at the joint, and the horizontal axis represents the value of the rotation angle φ of the joint. (A) shows the case of rigid joining, (b) shows the case of pin joining, and (c) shows the case of the joining type in the present embodiment. (A),
In the case of (b), there is no area of the hysteresis characteristic and there is no energy absorption, but in the case of (c), energy absorption corresponding to the area S surrounded by the hysteresis curve is expected.

The hysteresis characteristic of the joint in the present embodiment as shown in FIG. 3 (c) is not due to the yield of the steel material like the hysteresis damper, but to the damper component 12
This is due to the sliding of the support plate 9 with the support plate 9. For this reason, in the vibration damping structure of the building according to the present embodiment, even if the earthquake occurs, there is no deterioration such as cumulative plastic strain or steel fatigue, and only a slight wear of the friction surface occurs, which is basically maintenance-free. can do.

Further, in the vibration damping structure for a building according to the present embodiment, the beam 2 and the center member 4 are formed by a friction damper.
Is controlled, so that a large force is not locally applied to these ends. Conventionally, rigidity must be increased in order to increase the horizontal strength of a building, and in order to secure the required strength locally, building structures such as adding braces and enlarging some of the beams are required. In some cases, the rigidity of the building had to be increased more than necessary, which sometimes hindered architectural planning. However, in this building's vibration damping structure, since a large force is not applied locally, it is easy to set and control the rigidity and the proof stress separately, and the degree of freedom of design is increased compared to the past. It will be.

Further, by controlling the bending stress at the end of the beam 2, the bending and the axial force of the column 1 are reduced as compared with the case of the rigid connection. Therefore, according to the vibration damping structure of the building, economical design can be performed for the pillar.
In addition to this, in the vibration damping structure of the building according to the present embodiment, since the end stress of the beam 2 is not increased as compared with the case of the rigid connection, the end welded to the column 2 as a bracket from the column 2 The member 3 can be shortened. This is advantageous when transporting the column 2.

The vibration damping structure for a building according to the present embodiment has the above-mentioned advantages. However, when the structure is installed in a building, it is generally used in a general steel-framed building. This has the advantage that it can be installed by simply changing the filler plate used at the joint between the steel members constituting the beam to the damper component 12. As described above, the vibration damping structure of the building according to the present embodiment is:
It can be constructed with exactly the same appearance and construction method as a seismic structure frame of a normal building, and requires no special equipment and structure. Therefore, it is superior in terms of installation cost as compared with other vibration control structures.

An embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiment, and may be modified in accordance with the structure of the building to be installed, and according to the required degree of vibration damping performance, etc. It can be done. For example, FIG. 4 shows an example in which the building damping structure of the present invention is applied to a bent column 15 in a building. As shown in the figure, the bending column 15 is installed in the middle of the beam 2, and the end member 3 is fixed to the beam 2,
A central member 4 is erected between the two. The vibration damping structure for a building structure according to the present invention is applied to the joint between the center member 4 and the end member 3, and the center member flange 7, which is the flange of the center member 4, and the supporting plate 9 are provided as described above. In the same manner as in the embodiment, a damper component (not shown) is interposed. By applying the present invention to a bent column in this way, it is possible to obtain a vibration damping effect in an earthquake-resistant frame of a building.

Further, in the above embodiment, the damper component 12 is interposed between the attachment plate 9 and the center member flange 7, but instead of the attachment plate 9 and the center member flange 7, It is also possible to omit the damper component 12 by applying a friction coating to the joint. Further, by using an organic paint as a surface treatment of the friction surface, it is possible to prevent the noise of the slip when the friction surface slips due to an earthquake or the like.

In the above-described embodiment and the above-mentioned modified examples, the case where the friction damper is mainly provided between the frame components is described as an example. However, the friction damper may be a viscoelastic damper. It is possible. In this case, for example, a damper component using a viscoelastic body may be used as the damper component 12 in the above embodiment. By doing so, at the time of an earthquake, the viscoelastic body undergoes shear deformation, and the vibration energy in the building is absorbed. In addition, there is an advantage that a product having a relatively high damping action can be manufactured compactly.

[0024]

The vibration damping structure of a building according to the present invention can be applied to a case where a beam or a column of the building is constituted by connecting a plurality of frame components. The joint between the attachment plate connecting the ends of the frame component and the frame component is a damper. Therefore, the present invention can be applied to, for example, a conventional steel-framed earthquake-resistant frame. In particular, if the present invention is applied to a beam or a bent column in a building, a high damping effect can be obtained in the same frame type as that of a normal building, and a part of a beam or a column of a building, which has been conventionally used, Or, as compared with a vibration control structure installed outdoors or the like, it is not only advantageous in terms of installation cost, but also does not hinder the architectural plan.
Further, in the vibration damping structure of a building according to the present invention, the damper component is interposed between the attachment plate and the frame component to constitute the damper. Just use the damper component instead of the filler plate interposed between
It becomes possible to install the vibration damping structure of the building of the present invention. In this case, it can be constructed and installed with almost the same appearance and procedure as the conventional earthquake-resistant frame. Furthermore, when a friction damper is used as the damper, the present invention acts to control the end stress of the beam or the bending column and the members constituting the beam or the bending column. No force is applied, so that economical design of members such as beams, bent columns, and columns connected to them can be performed, and the stiffness and strength of the building can be controlled separately. This increases the degree of freedom in architectural planning. In addition, when the friction damper is used as the damper as described above, there is no deterioration such as accumulated plastic strain and steel material fatigue as compared with the case where the hysteresis damper is used for the steel material or the like, which is advantageous in terms of maintenance cost. Further, a viscoelastic damper may be used as the damper, and in this case, the damper can have high vibration damping performance.

[Brief description of the drawings]

FIG. 1 is a side view of a part of a frame in a building showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating a main part of FIG. 1;

FIG. 3 is a diagram illustrating a relationship between a bending moment and a rotation angle at a joint portion between a center member and an end member, for explaining a vibration damping effect according to an embodiment of the present invention, in comparison with another joint type.

FIG. 4 is a side view of a part of a frame in a building showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 End member 4 Central material 9 Attached plate 12 Damper constituent material

Claims (5)

[Claims] 1. A vibration damping structure for a building provided on a pillar or a beam of a building, wherein the first frame forming member constitutes at least a part of the pillar or the beam, and one end of each frame is abutted with each other. And a second frame component, and an attachment plate disposed along the ends of the first frame component and the second frame component and fixed thereto. A vibration damping structure for a building, wherein at least one of the connecting portions of the attachment plate and the attachment plate is configured as a damper. 2. The vibration damping structure for a building according to claim 1, wherein said first frame component is composed of a pair of end members fixed to a column or a beam, and said second frame component. Is constituted by a central member arranged in the middle of the end members. 3. The vibration damping structure for a building according to claim 1, wherein a damper component is interposed in said coupling portion configured as said damper. Construction. 4. The vibration damping structure for a building according to claim 1, 2 or 3, wherein the damper is a friction damper. 5. A vibration damping structure for a building according to claim 1, 2 or 3, wherein said damper is a viscoelastic damper.