A three-way shock-absorbing and isolating support system suitable for cable-stayed bridges and suspension bridges

Abstract

The invention discloses a three-way seismic mitigation and isolation supporting system suitable for a cable-stayed bridge and a suspension bridge. A girder is located at a bridge tower; a first bi-direction seismic mitigation and isolation supporting base and a first vertical-direction seismic mitigation and isolation supporting base are arranged between the bottom of the girder and a cross beam of the bridge tower; second bi-direction seismic mitigation and isolation supporting bases are arranged between the girder and pad stones on the sides of the girder in the side direction; a third bi-direction seismic mitigation and isolation supporting base and a second vertical-direction seismic mitigation and isolation supporting base are arranged in the positions, between the girder bottom and the tops of an auxiliary pier and a sharing pier, of the girder, and the girder is located between the auxiliary pier and the sharing pier; and a viscous fluid damper is arranged between the girder and the cross beam of the bridge tower in the bridge direction. According to the three-way seismic mitigation and isolation supporting system suitable for the cable-stayed bridge and the suspension bridge, the bi-direction seismic mitigation and isolation supporting bases and the vertical-direction seismic mitigation and isolation supporting bases which are adopted in the system have the functions of sliding in the bridge direction and sliding in the two directions in the normal using state and have a seismic mitigation and isolation function in the transverse direction of the bridge and in the vertical direction as well as a vertical seismic mitigation and isolation function, in order that the structural static force design requirements and the seismic mitigation and isolation design requirements are met at the same time and the seismic mitigation and isolation effect is achieved to the greatest extent, the bi-direction seismic mitigation and isolation supporting bases are simultaneously used for supporting of the bottom of a girder body and supporting of the side surfaces of the girder body at the bridge tower.

Description

technical field [0001] The invention relates to the technical field of bridges, specifically a three-way shock-absorbing and isolating support system suitable for cable-stayed bridges and suspension bridges. Background technique [0002] Cable-stayed bridges and suspension bridges have strong spanning ability and beautiful shape, and have been more and more widely used in bridge construction in my country, especially when crossing special terrains such as large rivers, rivers or canyons. The structural mechanical characteristics of cable-stayed bridges and suspension bridges are similar. They transmit the load of the main girder to the bridge tower through the cable-stayed bridge, suspenders and main cables respectively. Therefore, the bridge towers of cable-stayed bridges and suspension bridges are often thicker. And the rigidity is very big. Larger stiffness leads to greater response of bridge towers under earthquake action, especially when the bridge span is large or the...

AI Technical Summary

Problems solved by technology

When the traditional seismic design method is adopted, due to the importance of the bridge tower to maintain the structural system, it is usually required to maintain an elastic state during earthquake action. Earthquake action, lack of reasonable energy-dissipating structure, the design can only meet the requirements by increasing the cross-sectional size of the bridge tower, the reinforcement, and the size of the foundation. The auxiliary piers and shared piers also have similar problems, which will cause a lot of waste of materials , The increase of construction cost and the difficulty of construction

Especially when the bridge site is located in the near-field seismic area, the near-field seismic action not only has high seismic intensity, but also has a large vertical seismic component. It is often difficult to meet the design requirements with traditional seismic design methods, and the design is very difficult

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