A lateral displacement control method of long-span arch bridges for high-speed railways

Abstract

Provided is a method for controlling transversal displacement of a high-speed railway long-span arch bridge. The method effectively solves the problem of transversal displacement control of a long-span deck type railway concrete arch bridge, enables the structure design of the long-span deck type railway concrete arch bridge to be simpler and more reasonable and lowers bridge engineering investment effectively. A main bridge structure system is composed of a main arch ring, on-arch pier studs and a main bridge beam part, the main bridge beam part is regarded as an equivalent simply supported beam being free of transversal restraining of the on-arch pier studs, the main arch ring is regarded as an elastic support for the on-arch pier studs, and the main arch ring and the on-arch pier studs only transfer horizontal loads to the equivalent simply supported beam. The on-arch pier studs are arranged on the main arch ring uniformly, horizontal force transferred by the on-arch pier studs is equivalent to horizontal uniformly distributed loads, a transversal displacement curve of the main bridge beam part is fitted by a transversal deflection curve of the equivalent simply supported beam under the effect of the horizontal uniformly distributed loads, the min-span horizontal deflection delta of the main bridge beam part is controlled according to the following formula that delta<=L / 3200, the requirement for the transversal smoothness of a high-speed railway line can be met effectively, and in the formula, L is the length of the main bridge beam part.

Description

technical field [0001] The invention relates to bridge engineering, in particular to a lateral displacement control method of a large-span arch bridge on a high-speed railway, which can effectively reduce bridge engineering investment under the premise of ensuring the safety and comfort of the bridge running on high-speed trains. Background technique [0002] Expressways, high-speed railways, and air transportation are the three major components of my country's rapid transportation network. Currently, the three transportation methods are rapidly being constructed and developed. The design speed of high-speed railways is above 200km / h, most of which are 250-350km / h. [0003] When the train passes the bridge, the running speed is different, and the impact is also different. When the driving speed reaches above 200Km / h, the influence of dynamic problems will control the design of the bridge, directly affecting the safety of driving and the comfort of passengers. Therefore, in...

AI Technical Summary

Problems solved by technology

If the traditional control standard is still adopted for such long-span complex bridges, and the first-order lateral natural vibration period of the bridge is controlled within 1.7S, it will cause a great waste of engineering quantity, and even affect the selection of the bridge type.

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