JP2576221B2 - Structure connection structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connection structure of a structure in which a damper for absorbing vibration energy is installed at an expansion joint of a structure.

[Problems to be solved by the invention]

Expansion joints are installed between long structures and structures with different natural periods in order to avoid collisions due to vibrations of the separated structure against earthquakes.This is achieved by dividing the structures into appropriate units. In this case, vibrations are generated for each unit to prevent a failure such as a crack in a structure in the case of behaving as a whole. Conventionally, the function is merely the same.

The present invention focuses on the passive function of a conventional expansion joint, and proposes a connection structure for a structure that achieves a vibration damping effect of structures having different vibration characteristics that cause torsional vibration when an external force is applied. Out.

[Means for solving the problem]

In the present invention, a damper that absorbs horizontal vibration is straddled between the structures of the structures separated by the expansion joint, and the vibration energy of each of the separated structures is connected by connecting the two structures with the damper. In addition to adding the function of absorbing vibration at the joint part and attenuating vibration to the joint at an early stage, the structure separated from each other is decentered by shifting the position of the rigid center and the center of gravity, causing torsional vibration against earthquake motion. Then, by increasing the relative horizontal deformation between the structures to which the damper is connected, the damper can exhibit an energy absorbing ability according to the amount of the deformation and function effectively.

The dampers straddled between the structures are interposed between the beams projected from each structure horizontally in a cantilever manner, between beams and slabs, or on each beam projected from each structure. The connecting member is placed between the heads of the members, and is installed between the structures.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings showing an embodiment.

According to the present invention, as shown in FIG. 1-I, the rigidity and the center of gravity of the structure S are arranged in a non-uniform manner in each of the structures S separated by the expansion joint. By eccentricity, the structure S causes torsional vibration when an external force is applied, and furthermore, as shown in II, the damper D is installed at the expansion joint position where the structure shakes most during this torsional vibration, thereby increasing the amount of deformation of the damper D. This effectively causes the damper D to exhibit a high energy absorbing ability.

In the embodiment shown in FIGS. 2 to 4, a beam 1 or a slab 2 is horizontally and cantilevered from each of the structural bodies S, S with a level difference, and the beam 1 or the slab 2 is provided between the two beams 1, 1. Or a case where a damper D is interposed between the beam 1 and the slab 2.

The damper D in FIG. 2 uses a high-damping rubber or a viscoelastic material having its own energy absorbing ability.
The embodiment shown in FIG. 4 is a case where an elasto-plastic damper is used, which bends and shears in response to a horizontal shearing force to plasticize from elasticity and absorbs energy by its plastic deformation ability.

The damper D shown in FIG. 2 to FIG.
Alternatively, although fixed to the slab 2, the damper D in FIG. 3 is installed in a state where the rotation of the head is not restricted.

The embodiment shown in FIG. 5 is an example of use of a damper D of the type shown in FIG. 3, but two dampers D, D are mounted on beams 1, 1 projecting from both structures S, S at the same level. In this case, two dampers D, D are connected to each other with the connecting member 3 separated from the structures S, S being straddled between the heads.

The connection structure of the structures S, S described above is particularly a plan view as shown in FIGS. 6-I and II, and a three-dimensional view of the corners of the structures S and S as shown in FIGS. 6-I and II. As shown in (1), it is effective to apply to a location where the relative horizontal displacement of the two structures S, S is large, such as the top of the structures S, S, or the position corresponding to the antinode of the vibration mode.

Here, a vibration model of a structure according to the present invention as shown in FIGS. 8 and 9 (model 1 and model 2 respectively)
And a model of a structure not provided with the expansion joint shown in FIG. 10 and not implementing the present invention (model 3)
Table 1 shows the comparison with Table 1. In the figure, I and II are a plan view, an elevation view, an arrow indicates a vibration direction, a circle indicates a place where the damper D is installed, and a solid line in the plan view indicates an earthquake-resistant frame. Model 1 is a case where only one-way translational vibration is applied, and Model 2 is a case where a torsional vibration is added.
Buildings C and D behave individually, and Model 3 behaves as a whole.

From this table, in the model 1 structure, the response value when the damper D is installed is reduced to 65% (0.34 / 0.52) compared to that when the damper D is not installed, and in the model 2 structure, the response value is smaller than the model 3 structure. 48% (0.21 / 0.44), 62 for model 1
% (0.21 / 0.34), and the large energy absorption effect by the installation of the damper D is remarkable especially in torsional vibration by appropriately changing the vibration characteristics such as eccentricity of each separated structure S. It can be seen that it appears. JD in the table is the damper (joint damper) of the present invention.

〔The invention's effect〕

The present invention is as described above, and a damper as an energy absorbing device is interposed between beams or slabs protruding from the structure between the structures separated with a gap, and thereby both structures are installed. Since the connection is made, the construction is easy, and the vibration energy of the divided structure is consumed by the individual dampers, so that the vibration of the structure is attenuated at an early stage.

In particular, as described above, it is possible to effectively exert the energy absorbing ability of the damper by arranging the seismic elements of each structure eccentrically and generating torsional vibration in the structure.

[Brief description of the drawings]

FIGS. 1-I and II are plan views showing the arrangement of the structures, FIGS. 2, 3, 4 and 5 are elevation views showing an embodiment of the present invention, and FIGS. 6-I , II is a plan view showing a place where the present invention is implemented in the structure, FIGS. 7-I, II, and III are elevation views of the same, and FIGS. 8 and 9 are models of the structure embodying the present invention. And FIG. 10 is a conceptual diagram showing a model of a structure not to be implemented, in which I is a plan view and II is an elevation view. S ... structure, D ... damper, 1 ... beam, 2 ... slab, 3 ... connection member.

Continued on the front page (72) Inventor ▲ Yoshi ▼ Shigeru Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Naoki Tanaka 2-191-1, Tobita-Shi, Chofu-shi, Tokyo Shika Shima Construction Co., Ltd. (72) Inventor Toshiyuki Fukumoto 2-19-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Shozo Maeda 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 in Kashima Construction Co., Ltd. (56) References JP-A-64-36840 (JP, A)

Claims (2)

(57) [Claims] A structure in which a rigidity and a center of gravity of a structure separated from each other at a distance in a horizontal direction by an expansion joint are eccentric, and a horizontal vibration is absorbed between the structures which generate a torsional vibration when an external force is applied. Between the beams that straddle the damper and project the cantilever horizontally from the structure,
Alternatively, the structure is connected between the beam and the slab, and the two structures are connected by the damper. 2. A structure in which a rigid center and a center of gravity of a structure separated from each other at a distance in the horizontal direction by an expansion joint are eccentric to each other, and absorb horizontal vibration between structures which cause torsional vibration when an external force acts. A damper is straddled, and the damper is placed on each of the beams projecting from the two structures horizontally in a cantilever manner, and a connecting member separated from the two structures is straddled between the heads, and the damper is used. A connection structure of structures in a structure, wherein both structures are connected to each other.