JP3690453B2 - Vibration control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a building vibration control device, and more particularly, to a vibration control device that integrally couples a brace constituting a frame of a structure with an oil damper incorporated in a beam.
[0002]
[Prior art]
The seismic safety of buildings has been highlighted due to the recognition that conventional design standards are not necessarily perfect for large seismic forces, and as a countermeasure, seismic isolation and seismic control that can greatly reduce seismic forces. The structure has attracted attention and has become a social concern. For this reason, many proposals for seismic isolation and damping structures have been made from various directions, but simple and effective damping structures are still undeveloped.
[0003]
In particular, the seismic control structure that combines the oil damper with the V-type or K-type brace is widely adopted because it can effectively transmit the interlayer deformation during an earthquake to the oil damper and can construct a seismic control frame with a simple configuration. Has been.
As shown in FIG. 4, a conventional vibration control structure combining an oil damper with a V-type brace has a V-type brace 22 built on a structural surface composed of columns and beams, and is placed on a lower beam 23. In general, the V-type brace 22 is attached to the attached oil damper 24.
[0004]
In this structure, in order to prevent the oil damper 24 from being eccentrically bent, the crossing point 25 of the brace is generally set to the central axis of the oil damper, and as a result, the beam core 26 of the large beam Was to be decentered by an interval h as shown.
Therefore, in the conventional vibration control device, by arranging the oil damper 24 on the large beam 23, a bending moment is generated in the large beam 23 by the eccentric interval h. In addition, since the gradient of various braces is reduced by the height of the oil damper, it is difficult to secure the dimensions of the opening of the passage and the like. There were problems such as becoming.
[0005]
[Problems to be solved by the invention]
In the present invention, a bending moment is generated in the girder because the oil damper protrudes on the girder, which is a problem of the damping structure in which the oil damper is combined with the V-type or K-type brace. In addition, it has improved the point that it has been difficult to secure the opening dimensions of passages etc. due to the large area occupied by structural members and dampers at the floor level and the small gradient of V-type or K-type braces. In the same way as a general V-type or K-type brace frame, there is no need for a fireproof coating, and a simple seismic control device without any special restrictions in the structure plan is provided.
[0006]
[Means for Solving the Problems]
The present invention is a vibration control device that incorporates an oil damper in a beam and integrally couples the oil damper and a frame brace arranged in a frame surrounded by a column and a beam, and a piston rod penetrates a cylinder. A double rod type oil damper, a mounting portion provided in a cylinder of the oil damper and coupled to the frame brace, and having a built-in oil damper by contacting both ends of the piston rod. By constructing the oil damper built-in beam as a single unit, processing of the oil damper built-in beam is performed separately with high accuracy at the factory, etc., and the beam center and the crossing point of the frame brace are matched. By adopting a double rod type and viscous system, the vibration control efficiency is improved without generating a bending moment in the large beam, and it is as small as a wind load. Works effectively to form a that no seismic damping device causing trouble in structural planning and construction surface.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view of a structural surface shown for explaining a vibration control device according to the present invention. The seismic damping device 1 according to the present invention incorporates an “oil damper built-in beam” 2 in which an oil damper is built in a beam into a lower large beam 3, and an oil damper 4 and a column and beam in the “oil damper built-in beam” 2. It is constituted by integrally connecting a frame brace 6 arranged in a frame 5 surrounded by the frame.
The oil damper 4 incorporated in the lower beam 3 is assembled so that the central axis of the oil damper 4, the beam core, and the crossing point of the frame brace 6 coincide with each other. The bending moment to the big beam, which is a problem of the vibration control structure combined with, is eliminated.
With the above configuration, the vibration control device according to the present invention can effectively absorb the seismic energy by transmitting the interlayer deformation at the time of the earthquake in the building to the oil damper as it is and using the viscous resistance of the oil damper as the vibration control force. it can.
[0008]
Next, the structure of the “oil damper built-in beam” 2 will be described with reference to FIG.
The “oil damper built-in beam” 2 forms a dig 7 at a position corresponding to the central portion of the large beam, and a double rod type oil damper 4 in which the piston rod 16 penetrates the cylinder 13 is arranged in the dig 7. Both ends of the digging 7 are in contact with both ends of the piston rod 16 of the oil damper 4 and function to receive the reaction force, so that both ends are configured as force plates 8 and 8 having sufficient strength. .
[0009]
Since the oil damper 4 is installed in a dug space under the floor, it is easy to attach and remove the oil damper, and it can easily cope with out-of-plane deformation restraint (anti-slip). And since the web of the beam end part H-section steel mentioned later is extended and welded to the back surface of the force plate 8, bending stress does not generate | occur | produce in the force plate 8. FIG.
Since the oil damper 4 does not use a clevis or a ball joint as in the prior art, no special processing or equipment is required.
The cylinder of the oil damper 4 is provided with a brace mounting portion 9 for coupling with the frame brace 6, and when the frame brace 6 is assembled on site, the oil damper 4 mounting portion 9 and the frame brace 6 are connected to the high-strength bolt. Etc. are joined together.
[0010]
The oil damper 4 has a large relative displacement generated between the lower beam 3 and the frame brace 6 because the horizontal rigidity of the V-type brace is large when the building is subjected to seismic force and the structure undergoes interlayer deformation. Receiving the part, it exerts its damping function, works to suppress the seismic force and functions to protect the building from the earthquake.
[0011]
The portion provided with the digging 7 of the “oil damper built-in beam” 2 has a shape in which the beam width is slightly expanded, and a box shape is formed on both sides by welding the cover plate 10 to the upper and lower flanges. . And at the tip, it is integrated with the end H-section steels 11, 11, and the end H-section steel is provided with bolt holes 12 so that friction welding can be performed with a large beam and a high-strength bolt in the field.
[0012]
Since the “oil damper built-in beam” 2 is configured as a single unit as described above, the processing of the “oil damper built-in beam” can be performed separately with high precision at a factory, etc. As with the construction, it is brought in when assembling and installing the large beam and brace, and after adjusting the arrangement of the “oil damper built-in beam” 2, it is joined by friction welding with high-strength bolts or on-site welding.
The oil damper 4 attached to the “oil damper built-in beam” 2 has a center axis and a center point that coincide with the crossing point of the beam core of the large beam and the V-shaped brace. Even if interlaminar deformation occurs, the force from the V-type brace is applied only to the beam as the force in the beam core direction, no bending moment is generated in the beam, and only the horizontal force in the axial direction acts on the oil damper. No rotation or twisting.
[0013]
As shown in FIG. 3, the oil damper 4 has two oil chambers 14, 15 in a cylinder 13, and both ends of the piston rod 16 are curved and one end thereof is adjusted by an adjusting screw 17. The length is adjustable.
Both oil chambers are connected by a conduit 22 via a control unit 21 in which a valve 19 and an orifice 20 are connected in parallel.
Therefore, if the cylinder 13 is fixed and the piston rod 16 is moved to the left, the pressure in the oil chamber 14 increases and the pressure in the oil chamber 15 decreases. Due to this pressure difference, the oil moves in the conduit through the orifice 20, and the resistance force at the orifice 20 is utilized as a damping force.
[0014]
The damping characteristic of the oil damper 4 can be adjusted according to the degree of opening and closing of the valve 21 connected in parallel with the orifice 20, so that the damping degree becomes excessively high and damages the structure. The degree of attenuation can be set as appropriate so that the degree of attenuation is not too low and the damping effect is not insufficient.
In addition, if a viscous oil is used as the oil, it is possible to make an effective vibration control structure even in the case of slight deformation of the building or wind load, so that not only the comfort is improved but also the acceleration reduction effect is great. Not only the structural safety of the building but also the equipment and fixtures in the building can be prevented from falling over.
[0015]
In addition, the connection with the small beam perpendicular to the large beam with the oil damper built in the beam is the same deformation as the floor on both sides of the beam. It can respond by doing.
In addition, although the case where a V-type brace is adopted as the above-mentioned frame brace has been mainly described, an excavation is provided in the upper beam from the lower side, an oil damper is attached, and this is joined to the K-type brace. The use of other frame braces without departing from the basic spirit of the present invention is naturally included in the scope of the present invention.
[0016]
【The invention's effect】
The present invention is a vibration control device that incorporates an oil damper in a beam, and integrally couples the oil damper and a frame brace arranged in a frame surrounded by columns and beams, and further includes a beam core and a frame brace. Since the oil damper is made to be a double rod type, the following effects can be obtained.
(1) Since the external appearance is the same as that of a frame brace found in a general steel structure, there is no special design restriction, and the vibration control device according to the present invention can be adopted as in the conventional earthquake-resistant design.
(2) Since the oil damper does not protrude on the beam, the area occupied by the structural member and damper at the floor level can be reduced, the gradient of the frame brace with respect to the horizontal plane can be increased, and the passage opening and the like can be increased.
(3) Since the beam center and the crossing point of the frame brace coincide, the bending moment due to eccentricity does not act on the beam, and there is no possibility of bending the beam or floor slab by the force from the frame brace and causing shear cracks. . Similarly, no eccentric bending occurs in the frame brace. Further, since the oil damper does not rotate, an excessive force does not act on the oil damper, and the attachment with the structure is simple, and safety is ensured.
(4) Since the oil damper is built in the beam, the inter-layer deformation becomes the shear deformation of the oil damper as it is, the seismic efficiency is good, and the response at the time of the earthquake is small, so the cross section of the structure can be reduced and the cost can be reduced I can plan. In addition, since the oil damper is installed in a dug space under the floor, it is easy to attach and remove the oil damper, and it can easily cope with out-of-plane deformation restraint (anti-slip).
(5) Since the oil damper is a double rod type in which the rod integrated with the piston penetrates the cylinder, the same characteristics can be exhibited even with respect to deformation from either the left or right. Further, since clevises and ball joints are not required at both ends, the overall length is short and compact, and a movable mechanism is not required, thereby reducing the cost of the damper.
(6) The oil damper is a viscous damping device that has a small residual deformation of the structure and can maintain its function without leaving any harmful residual deformation in the building after the earthquake. Adjusting the valve provides damping performance and relief load. It can be adjusted arbitrarily. In addition, it exhibits an effective vibration control function even for small deformations such as wind loads, and can prevent falling of equipment and fixtures in the building by utilizing the effect of greatly reducing acceleration.
Furthermore, it can be manufactured at the factory as an “oil damper built-in beam” and there is no installation work on site. In addition to being maintenance-free, even if an abnormality occurs in the oil damper, it can be easily replaced.
[Brief description of the drawings]
FIG. 1 is a front view of a structure of a vibration control device according to the present invention. FIG. 2 is a perspective view of an “oil damper built-in beam” according to the present invention. FIG. 3 is an oil damper. Explanation of symbols]
1 Seismic control device 2 “Oil damper built-in beam”
3 Large beam 4 Oil damper 5 Structural surface 6 Frame brace 7 Digging 8 Force plate 9 Brace mounting portion 10 Cover plate 11 End H-shaped steel 13 Cylinders 14 and 15 Oil chamber 16 Piston rod 17 Adjustment screw 18 Valve 19 Orifice 20 Control Part 21 Pipe line 22 V-type brace 23 Large beam 24 Oil damper 25 Brace intersection 26 Large beam beam center

Claims (2)

In the vibration control device that arranges the frame brace integrally connected in the frame surrounded by the columns and beams,
A piston rod having a double rod type oil damper penetrating the cylinder; a mounting portion provided on the cylinder of the oil damper and coupled to the frame brace; and both ends of the piston rod contacting each other The oil damper built-in beam having a ditch with a built-in oil damper is configured as a single body, the end of the oil damper built-in beam is joined to the beam and incorporated into the beam, the central axis of the oil damper, A seismic control device characterized in that a beam core of the beam and an intersection of the frame brace are made to coincide with each other. 2. The vibration control device according to claim 1, wherein the end of the piston rod is curved at both ends, and the length of one end of the piston rod can be adjusted by an adjusting screw.

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