Outer-side span stay cable-free stay bridge with horizontal stress performance improved

Abstract

The invention discloses an outer-side span stay cable-free stay bridge with horizontal stress performance improved. A girder is supported by bridge towers, auxiliary piers and transition piers. The auxiliary piers are arranged on two sides of the bridge towers, and the transition piers are arranged on two sides of the auxiliary piers. The portion, between the auxiliary piers and the transition piers, of the girder is connected with columns of the bridge towers without stay cables. The girder is supported by the transition piers through first vertical support seats with horizontal unlocking functions. The auxiliary piers support the girder through second vertical support seats and are connected with the same through horizontal damping devices. Damping direction of the horizontal damping devices is the horizontal direction of the girder. Lower beams of the bridge towers support the girder through third vertical support seats. The girder is connected with the columns of the bridge towers through horizontal support seats which are horizontally distributed along the girder. According to the arrangement, stress applied to the auxiliary piers, the transition piers and the base is greatly decreased under horizontal earthquake action, the stress to the auxiliary piers and the transition piers is harmonized, and horizontal displacement occurring in case that the auxiliary piers are under the earthquake action, of the girder is under control.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a cable-stayed bridge, in particular to a cable-stayed bridge with no cable-stayed outer spans and improved transverse dynamic performance. Background technique [0002] Since the first experimental cable-stayed bridge was built in 1975, my country has become the country with the largest number of cable-stayed bridges in the world after nearly 40 years of development. As a flexible structure, cable-stayed bridges are sensitive to dynamic loads such as wind and earthquakes. With the global climate change, frequent typhoons and strong earthquakes, the dynamic performance of cable-stayed bridges has attracted more and more attention. [0003] The connection types of the upper part and the lower part of the cable-stayed bridge can be generally divided into three categories: rigid, free and damping. Generally speaking, the rigid connection has the largest stiffness, the s...

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Problems solved by technology

[0006] The problem to be solved by the present invention is that the existing cable-stayed bridges with no cable-stayed outer spans cannot effectively reduce the internal force and displacement of piers and foundations under dynamic loads such as lateral earthquakes

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