JP2002349093A - Seismic control structure of structure having large space - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic control structure of a structure having a large space, which enables effective execution of vibration control. SOLUTION: This seismic control structure, which brings about seismic control of the structure having the large space and a hollow structural member 3 disposed around the large space, is characterized in that tuned mass dampers 4 and 5 are built into the structural member 3. The seismic control structure allows a seismic control effect to be effectively brought about by the dampers 4 and 5, and enables the execution of the excellent vibration control. Additionally, the dampers 4 and 5 are disposed in the structural member 3 so as to be invisible from without and highly advantageous in terms of an architectural design.

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 suppressing vibration of a structure having a large space.

[0002]

2. Description of the Related Art Examples of structures having a large space include a baseball stadium and a stadium having a soccer or athletics track. Due to the nature of these structures having a large space, pillars and the like cannot be installed inside the large space. Therefore, in a dome-shaped baseball field or the like, the support span of the dome-shaped roof becomes very large. Similarly, in a stadium or the like, a large roof is installed above the spectator seats, and the large roof is often in a cantilever structure.

[0003]

It is well known that such a large-span dome-shaped roof and a cantilever-shaped large-sized roof structure are disadvantageous against vibrations caused by wind, earthquake, and the like. Not only the dome roof and the cantilevered large roof described above, but also a structure having a large space, a structure with a large span is built around the large space (not only in the horizontal direction but also in the vertical direction). It has a structural part that is disadvantageous for vibrations caused by earthquakes and earthquakes. Under such circumstances, there has been a demand for more effective vibration control in a structure having a large space.

An object of the present invention is to provide a vibration control structure capable of effectively controlling vibration in a structure having a large space.

[0005]

According to a first aspect of the present invention, a structure having a large space and a hollow structural member disposed around the large space is subjected to vibration damping. Is characterized by having a tuned mass damper built inside.

According to a second aspect of the present invention, in the first aspect, the hollow structural member is a roof frame that covers a large space from above.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a structure having a large space (large dome structure) to which an embodiment of the present invention is applied. FIG. 2 is a side view of a node (node) of the dome structure incorporating the vibration control mechanism.

As shown in FIG. 1, a large dome 1 into which the vibration damping structure of the present embodiment is incorporated has a hollow cylindrical steel pipe (hollow structural member) 2 constructed in a lattice shape as a basic skeleton structure. ing. Then, the central portion of the basic skeletal structure becomes a raised shape, and a dome-shaped configuration is constructed.
Although not shown, a film is stretched on the dome 1 and the dome 1 itself is installed as a roof on a baseball stadium.

The dome 1 is supported only around the basic skeleton structure described above, and the central portion of the basic skeleton structure is not supported from below. The hollow round steel pipes (hollow structural members) 2 constituting the basic skeleton structure mainly include cross-shaped steel pipes (see FIG. 2; hereinafter, this crossed shape) arranged at nodes of the basic skeleton structure. The steel pipe is referred to as a node part 3) and a slightly curved steel pipe connecting the respective node parts 3 to each other. The latter steel pipe is slightly curved in accordance with the shape of the dome 1. Although a vibration damping mechanism described later is incorporated in the node unit 3 shown in FIG. 2, it does not mean that the vibration damping mechanism is necessarily incorporated in all the node units 3.

A flange 3a is formed at each end of the crossed steel pipe (node portion 3) and a slightly curved rod-shaped steel pipe, and the flanges 3a are fastened with bolts and nuts. The dome 1 of this embodiment is used as a roof of a baseball field, and each steel pipe has a diameter of 2 m.
Of the degree.

In addition, a passive vibration control mechanism composed of a mass-spring system shown in FIG. 2 is built in an arbitrary place of the above-mentioned lattice-shaped hollow steel pipe. In the present embodiment, the vibration damping mechanism is incorporated inside the node portion 3, but may be incorporated inside the rod-shaped hollow steel pipe. When incorporating the damping mechanism, the position and number of effective damping are determined in advance by analyzing the basic skeleton structure in advance. In addition, the natural frequency of each vibration control mechanism is also determined.

The vibration control mechanism is a tuned mass damper (TM)
D), which comprises a weight 4 and a spring 5. The tuned mass damper has a structure composed of a mass-spring system, and the natural frequency of the mass-spring system is tuned (tuned) to the natural frequency of the installed structure. By installing such a tuned mass damper, the vibration energy of the structure can be absorbed and the vibration of the structure can be reduced.

One end of a plurality of springs 5 is attached to the weight 4, and the other end of each spring 5 is attached to the inner surface of a steel pipe that serves as the node 3. As a result, the weight 4 is in a state of floating inside the node portion 3. As the spring used in the mass-spring system, a rubber member such as a laminated rubber may be used, or a metal spring may be used, as long as it can function as a mass-spring system spring. Anything is fine.

[0014] After the structure is finally assembled, vibration analysis is performed on the ground, and the tuning of each vibration control mechanism (tuned mass damper) is adjusted again based on the result. In this case, the node unit 3 of the corresponding portion may be once removed, retuned, and then reattached.
According to the vibration control structure of the present embodiment, vibration control can be effectively performed even in a structure having a large space. Also,
Since the tuned mass damper is incorporated inside the hollow structural member, it is not visually noticeable in appearance, and is very excellent in design.

Further, since the tuned mass damper is incorporated in the hollow structural member, there is very little danger that the performance will change due to long-term exposure to sunlight, wind and rain. Further, deterioration can be suppressed, which is advantageous from the viewpoint of durability.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the vibration control structure of the present invention is applied to the dome roof of a baseball stadium, but the present invention can be applied to other structures. For example, the present invention may be applied to a large cantilever roof such as a stadium. In this case, the pillar supporting the roof may be a hollow structural member, and a tuned mass damper may be incorporated therein.

Alternatively, when a large atrium such as an atrium is formed inside a building, the vibration control structure of the present invention is applied to a hollow structural member provided on a ceiling, a side wall, or a floor of the large space. May be. Alternatively, the vibration damping structure of the present invention may be applied to a hollow structural member constituting a truss when a large span skeletal structure is constructed by the truss.

[0018]

According to the present invention, since the vibration damping effect by the tuned mass damper can be effectively obtained, excellent vibration control can be performed. Further, since the tuned mass damper is disposed in the hollow structural member, it is not visible from the outside, and is very advantageous in terms of design. In addition, the tuned mass dampers can be installed at a plurality of locations in a distributed manner, and it is easy to make adjustments so that the effects of the vibration control can be reliably obtained. Further, by providing the tuned mass damper in the hollow structural member, it becomes easy to respond not only to vibration in a plane only in two dimensions but also to three dimensions in response to vibration.

Further, according to the vibration control structure of the present invention, the thickness of the hollow structural member can be reduced by the vibration control effect. For this reason, the vibration control structure of the present invention contributes not only to the reduction of raw materials but also to the improvement of workability by reducing the weight of the structural material, and also to the shortening of the construction period.

In the case of a large roof such as the above-mentioned stadium or baseball stadium, the wind swirling inside the stadium or the like blows up from below, which is often disadvantageous in terms of vibration. The vibration damping effect according to the present invention is very effective.
In these structures, because of their nature, the inevitable roof span becomes large, or the large roof is supported by a cantilever, so that the vibration control effect according to the present invention is very effective.

Further, since the weight of the roof portion can be reduced, there is an advantage that the load on the lower structure can be reduced (the lower structure can be reduced in cross section). Furthermore, a suspended object such as a speaker is often installed from the roof of the large space. However, if the present invention is applied to the roof of such a large space, it is advantageous for vibration control.

[Brief description of the drawings]

FIG. 1 is a schematic view of a structure (large dome structure) to which a vibration control structure of the present invention is applied.

FIG. 2 is a side view of a node (node) incorporating the vibration control mechanism of the dome structure shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dome (structure), 2 ... Hollow round steel pipe (hollow structural member), 3 ... Node part, 4 ... (of tuned mass damper)
Weight 5 ... Spring (of tuned mass damper).

Continued on the front page F term (reference) 3J048 AA06 BF04 BF09 DA07 EA38

Claims (2)

[Claims] 1. A damping structure for a structure having a large space and a hollow structural member disposed around the large space, wherein a tuned mass damper is built in the hollow structural member. , Vibration control structure with large space. 2. The vibration control structure for a structure having a large space according to claim 1, wherein the hollow structural member is a frame of a roof that covers the large space from above.