JPH08277650A - Bending deformation control type vibration damping structure - Google Patents

Abstract

PURPOSE: To reduce the bending deformation of the core of a bending deformation type structure and the overturn moment of leg sections. CONSTITUTION: This bending deformation control type vibration damping structure is constituted of a core 2 formed with multi-layer earthquake-resistant elements and an outer periphery frame 3, and a top girder 4 is protruded from the apex of the core 2 to the apex of the outer periphery frame 3 and is connected to the outer periphery frame 3. Leg sections of the outer periphery frame 3 are separated from a foundation 6, and vibration damping devices applying damping force to the core 2 are provided between the leg sections of the outer periphery frame 3 and the foundation 6 and are connected to both of them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces bending deformation of a bending-deformable structure composed of a core and an outer frame.
The present invention relates to a bending deformation control type vibration control structure.

[0002]

2. Description of the Related Art When a building frame is composed of a core consisting of multi-story seismic elements and an outer frame for the purpose of securing a large space, the core shares most of the horizontal force due to the difference in rigidity. Therefore, the deformation of the frame due to seismic force and wind pressure is dominated by the core deformation, but the frame with continuous seismic resistant elements tends to be bent and deformed as the height increases, so the core deformation can be reduced. It becomes a design issue for high-rise buildings.

The reduction of bending deformation of the core can be solved by increasing the rigidity of the entire frame including the outer frame.
If the rigidity of the entire frame is increased and the core and outer frame share the same horizontal force, the seismic force input to the outer frame will be excessive. On the contrary, if the core is designed so that most of the seismic force is loaded, the overturning moment at the legs of the core becomes excessive, so it is necessary to increase the cross-section and increase the rigidity of the lower floors. It can be impossible.

Focusing on the difficulty of reducing the deformation of a bending-deformable structure having a core and an outer peripheral frame, the applicant has previously proposed a structure that effectively reduces the bending deformation (Japanese Patent Laid-Open No. 7-2.
No. 6786), the present invention proposes a structure that reduces bending deformation by a method different from that of the previously filed invention.

[0005]

According to the present invention, by connecting the core and the outer peripheral frame with a top girder and separating the outer peripheral frame from the foundation, much of the seismic force is borne by the core, and excessive seismic force is applied to the outer peripheral frame. Avoid typing. Also, by connecting a vibration control device to the outer frame and foundation, the vibration of the core is damped, the response is reduced and bending deformation is reduced, and at the same time, a bending-back moment opposite to the deformation is applied to the core to reduce the seismic force. It reduces the overturning moment of the legs due to the heavy burden.

The top girder extends from the top of the core to the top of the outer frame and is connected to the outer frame. The legs of the outer frame that are connected to the top girder are separated from the foundation, and the core is placed between the legs of the outer frame and the foundation. A damping device that gives damping force is installed and connected to both.

The outer frame behaves integrally with the core by the top girder, and relative displacement due to bending deformation of the core occurs between the leg of the outer frame and the foundation. By being connected, a damping force corresponding to the bending deformation amount of the core is applied to the core, and the response of the core is reduced.

The core bears most of the seismic force by disconnecting the outer frame from the foundation while connecting it to the outer frame, but the amount of bending deformation is reduced by the vibration control device, and a bending back moment from the foundation is generated during bending deformation. By receiving it, the safety against the fall moment is obtained, and it is not necessary to take measures such as increasing the rigidity of the legs against the fall moment.

Further, since the core bears most of the seismic force, the outer peripheral frame is released from the seismic force, and only needs to have a function of bearing a long-term load, which increases the degree of freedom in designing the building. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration control structure 1 of the present invention comprises a core 2 composed of multi-layered seismic resistant elements 21 and an outer peripheral frame 3 as shown in FIGS. 1 and 2, and legs of columns 31 of the outer peripheral frame 3. The vibration is suppressed by the vibration control device 5 installed in the core to reduce the bending deformation of the core 2 and the overturning moment in the legs. The seismic resistant element 21 of the core 2 is constructed by an RC wall construction structure, an S construction brace structure or the like, and the structural form is not limited as long as bending deformation is dominant.

A top girder 4 projects from the top of the core 2 to the top of the outer peripheral frame 3 and connects to the outer peripheral frame 3, and the outer peripheral frame 3 behaves integrally with the core 2. The leg portion of the outer peripheral frame 3 is separated from the foundation 6, and a vibration control device 5 that applies a damping force to the core 2 is installed between the separated leg portion of the outer peripheral frame 3 and the foundation 6 and is connected to both. The legs of the outer peripheral frame 3 are separated from the foundation 6 at the columns 31, and the vibration control device 5 is connected to the legs of the columns 31 and the foundation 6. The top girder 4 is shaped like a high-quality wall beam,
It has a rigidity that is not significantly different from the rigidity of 21.

The basic principle of the vibration control device 5 is that a rod reciprocates in a hydraulic cylinder having hydraulic chambers on both sides of a piston, and a resistance force when the pressure oil moves between the hydraulic chambers is generated as a damping force. The hydraulic cylinder is connected to either one of the pillar 31 and the foundation 6 of the outer peripheral frame 3 and the rod to the other so as to be capable of relative rotational displacement, and when the pillar 31 is displaced relative to the foundation 6 in an arbitrary direction. The rod reciprocates to give a damping force to the core 2. The damping device 5 includes a passive high damping device that generates a damping force according to the relative displacement between the column 31 and the foundation 6 when the core 2 is bent and deformed, and a switching valve that moves and stops pressure oil. Is used, an active variable damping device is used that can be automatically switched and the damping force can be adjusted.

When the core 2 is bent and deformed, relative displacement occurs between the leg portion of the column 31 and the foundation 6, and a damping force corresponding to the relative displacement acts on the core 2 by the vibration control device 5, and at the same time the core 2 is restrained. It receives a bending-back moment in the direction opposite to the falling moment from the foundation 6 via the seismic device 5.

FIG. 3 shows the case where the intermediate girder 7 is installed between the core 2 and the outer peripheral frame 3. In this case as well, the outer peripheral frame 3 behaves integrally with the core 2, so that the seismic damping device 5 is mounted on the pillar 31. It is installed on the legs.

In the embodiment shown in FIGS. 1 and 3, the vibration control device 5 is used.
May be installed also in the connection part of the top girder 4 and the pillar 31, and in the embodiment of FIG. 3, it may be installed also in the connection part of the intermediate girder 4 and the pillar 31.

[0016]

The outer girder frame behaves integrally with the core by the top girder, the outer girth frame is separated from the foundation, and a vibration control device is installed between the leg of the outer girth frame where the relative displacement occurs and the foundation. As a result, a damping force corresponding to the amount of bending deformation is applied to the core, so that the response of the core during bending deformation can be reduced.

As a result of the outer frame connected to the core being separated from the foundation, the core bears most of the seismic force. The overturning moment of the leg due to the load is reduced, and it is not necessary to take measures against the overturning moment of the leg.

Since the outer peripheral frame bears almost no seismic force, it only needs to have a function of bearing a long-term load, which increases the degree of freedom in elevation planning.

[Brief description of drawings]

FIG. 1 is an elevation view showing a vibration control structure.

FIG. 2 is a plan view of FIG.

FIG. 3 is an elevational view showing another vibration control structure.

[Explanation of symbols]

1 ... Seismic control structure, 2 ... Core, 21 ... Seismic element, 3 ...
… Perimeter frame, 31… Pillars, 4… Top girder, 5
…… Seismic control device, 6 …… Basic, 7 …… Intermediate girder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiko Hatada 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A core composed of multiple layers of seismic resistant elements,
It is a structure consisting of an outer frame, the top girder overhangs from the top of the core to the top of the outer frame and connects to the outer frame, and the legs of the outer frame connecting to the top girder are separated from the foundation, and the legs of the outer frame A damping device that applies damping force to the core is installed between the
Bending deformation control type damping structure characterized by being connected to both sides.