JPH10325111A - Bridge girder base isolating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent large horizontal displacement by installing a hinge device so that moment transmitted from a bearing structure is not directly transmitted, and making a base isolating device trapezoidal so that the weight-receiving effective area of an upper structure is held constant. SOLUTION: A bearing structure in the form of a trapezoid formed by vulcanizing and bonding together a high-damping rubber plate 4 and a steel plate 3 is constructed between the plate 2 of an upper structure and the plate 8 of a lower structure to provide a large vertical supporting capacity and at the same time to withstand large deformation to exhibit a base isolating effect in the horizontal direction. A steel-rod damper made of lead 5 is installed in a base isolating device to prevent large displacement. Further, a hinge structure 1 is placed at the top so that large negative moment is not transmitted, so that unbalanced displacement and large horizontal displacement of the device are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device and a vibration damping device for a structure subject to vibration such as an earthquake, and more particularly to a support structure for a bridge.

2. Description of the Related Art It is assumed that rotation of a bearing does not occur using the form of a seismic isolation device of a building as it is, and is fixedly installed at a fulcrum of a bridge. As a result, the device has an unbalanced shape change, which adversely affects durability. Further, it cannot exert a seismic isolation effect against vertical loads of an earthquake and cannot control a large horizontal displacement. In other words, the conventional seismic isolation device changes the original boundary condition of the structural system, and a large moment is directly transmitted to the fulcrum, so that a large horizontal rotation angle occurs and affects the stability of the seismic isolation device. I am concerned.

The present invention eliminates the moment transmitted directly from the upper structure to prevent the generation of a large negative moment at the fulcrum, the rotation caused by the moment, and the horizontal displacement. It also absorbs seismic energy and withstands vertical and horizontal seismic loads at the same time, thereby solving the mechanical problems of previously developed equipment.

The moment transmitted from the structure can be solved by installing a non-moment transmitting device such as a hinge device, and in order to prevent a large horizontal displacement during a large earthquake. Next, a steel rod damper is installed in the device. In addition, the vertical vibration due to the earthquake is reduced by using an energy absorbing device for the vertical inertial force of the upper structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 relate to the invention 1 and have a large vertical supporting ability by vulcanizing and bonding a high-damping rubber plate and a steel plate, and at the same time endure large deformation and can be used in a horizontal direction. It is possible to build a bearing structure with seismic isolation effect. And a steel rod damper is installed in the seismic isolation device to prevent large displacement. In addition, a large moment can be eliminated by installing a hinge structure on the upper part. FIG. 4 shows the principle relating to the invention 1, wherein a moment MS is generated at the right end by a load, but the moment MO at the left end becomes zero, and no moment is transmitted to the bearing. FIGS. 5 to 8 relate to Invention 2, in which the connection between the rubber plate and the steel plate is the same as in Invention 1, but here the seismic energy is absorbed by attaching an oil damper 8 on top. The connection between the oil damper and the oil dampers 1 and 2 is performed by pins, and rotation is allowed, so that energy can be absorbed by the damper without generating a moment. Further, Invention 1
A hinge structure is installed in the same manner as above to eliminate the moment. FIG. 8 shows the principle relating to the invention 2. The upper figure shows the case where the seismic load acts upward. An inertial force F is generated at the center, and the force C due to this F is applied to the seismic load E.
Acts in the opposite direction, and can absorb energy by the oil damper. The figure below illustrates the same principle. FIGS. 9 to 12 relate to Invention 3, and show a seismic isolation device for a building structure. This is an apparatus for a structure having a strong vertical rigidity without the upper hinge portion as compared with the second aspect. FIG. 12 shows the principle according to the third aspect of the invention. When a horizontal force P is applied and a displacement Δ exceeding a limit is generated, the displacement is controlled by 10 energy absorbing capabilities.

The present invention solves a mechanical problem of a current bridge, that is, an unbalanced displacement of a device due to transmission of a large negative moment as it is and a large horizontal displacement. As a second aspect of the present invention, vibration control can be performed with respect to vertical force vibration, which could not be achieved by the conventional apparatus. According to the third aspect, a large horizontal displacement of the building structure can be controlled only by the seismic isolation device.

[Brief description of the drawings]

FIG. 1 is a plan view of Invention 1.

FIG. 2 is a front view of Invention 1.

FIG. 3 is a side view of the first invention;

FIG. 4 is a diagram illustrating the principle of invention 1;

FIG. 5 is a plan view of Invention 1.

FIG. 6 is a front view of Invention 1.

FIG. 7 is a side view of the first invention.

FIG. 8 is a principle diagram of the first invention.

FIG. 9 is a plan view of invention 1;

FIG. 10 is a front view of Invention 1.

FIG. 11 is a side view of the first invention.

FIG. 12 is a diagram illustrating the principle of invention 1;

[Explanation of symbols]

 1 Upper structure plate 2 Stress dispersion plate 3 Upper shoe 4 Lower shoe 5 Pin 6 Rubber plate 7 Steel plate 8 Oil damper 9 Rubber sheet 10 Steel bar damper 11 Lower structure plate 12 Ring 13 pin

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[Procedure amendment]

[Submission date] January 20, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

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[Document name to be amended] Statement

[Correction target item name] Claim 3

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[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] All figures

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FIG.

FIG. 2

FIG. 4

FIG. 7

FIG. 8

FIG.

FIG. 3

FIG. 5

FIG. 9

FIG. 11

FIG. 6

FIG. 10

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of the invention 1 in which 1 indicates a hinge, 2 indicates a plate having an upper structure, and 8 indicates a plate having a lower structure.

FIG. 2 is a front view of the invention 1, wherein 1 is a hinge, 2 is an upper structure plate, 3 is a steel plate, 4 is a rubber plate, 5 is lead, and 8 is a lower structure plate.

FIG. 3 shows a side view of the first invention.

FIG. 4 is a principle view of the first invention, which shows that the effective length is constant when receiving a force.

FIG. 5 is a plan view of a second embodiment of the present invention.

FIG. 6 is a front view of the second invention, wherein 1 is a hinge, 2 is a plate having an upper structure, 3 is a steel plate, 4 is a rubber plate, 5 is lead, 6 is an oil damper, and 8 is a lower structure. What represents a plate

FIG. 7 shows a side view of the second invention.

FIG. 8 is a principle view of the second aspect of the present invention, showing the movement of a structure under compression and tension.

FIG. 9 is a plan view of the invention 3 in which a rubber plate 4 is shown.

FIG. 10 is a front view of Invention 3, 7 is a steel rod damper, 2 is a plate of an upper structure, 3 is a steel plate, 4 is a rubber plate, 8
Indicates the plate of the lower structure

FIG. 11 shows a side view of invention 3;

FIG. 12 is a principle view of invention 3, showing displacement when receiving a force.

[Description of Signs] 1 Hinge 2 Upper structure plate 3 Steel plate 4 Rubber plate 5 Lead 6 Oil damper 7 Steel rod damper 8 Lower structure plate 9 Ring 10 pin

Claims (5)

[Claims] 1. A hinge device structure for supporting an upper structure such as a bridge and supporting a top and a bottom portion used for seismic isolation and vibration resistance, and installed so as not to directly transmit a moment; A stress distribution structure installed to distribute the downward load from the hinge device. 2. A damper structure of an energy absorbing device installed in a seismic isolation device in order to prepare for a vertical earthquake load. 3. A damper link structure provided for utilizing a vertical inertia force in an upper portion, and a damper utilizing the inertia force. 4. A structure that solves the mechanical problem of the present structure by installing a structure above the stress distribution plate of the present invention in a device that withstands earthquakes and vibrations developed to date. 5. A damper structure of an energy absorbing device installed in the device to prevent a large displacement.