Method of controlling rigidity of long span cable-stayed bridge of railway through stay cable

Abstract

The invention relates to the technical field of cable-stayed bridges and in particular relates to a method of controlling rigidity of a long span cable-stayed bridge of a railway through a stay cable. The method analyzes influence rules of the cable-stayed bridge on bridge dynamic characteristic, vehicle dynamic response and bridge dynamic response under different numerical values by establishing a long span cable-stayed bridge model of the railway and a bridge model by means of a dynamic analytical method, and performs judgment by taking an evaluating index system of a vehicle-bridge system as an index to obtain influence conditions on the integral rigidity of the bridge under different rigidity numerical values so as to further obtain a reasonable value range of the rigidity of the stay cable, thereby providing basis for valuing and designing the rigidity of the stay cable; the integral rigidity of the long span cable-stayed bridge of the railway is better controlled through the rigidity of the stay cable, so that the long span cable-stayed bridge of the railway achieves a breakthrough on the rigidity control technology; the technical problem is solved, so that the long span cable-stayed bridge of the railway is promoted, and a lot of engineering investment cost is saved.

Description

technical field [0001] The invention relates to the technical field of cable-stayed bridges, in particular to a method for controlling the rigidity of a railway long-span cable-stayed bridge through cable-stayed cables. Background technique [0002] When a high-speed train passes a bridge, both the vehicle and the bridge will vibrate. Excessive vibration will affect driving safety and riding comfort. Bridge vibration is directly related to bridge stiffness. Therefore, the bridge must have certain vertical stiffness and lateral stiffness. Only in this way can the requirements of train driving safety and passenger comfort be guaranteed. For long-span pure railway cable-stayed bridges, there are few engineering practices that can be referred to. There are only 6 railway cable-stayed bridges in the world, all of which are normal-speed railway cable-stayed bridges. Among them, there is only Hongshuihe Bridge with a span of 96m in China. The railway cable-stayed bridge with the l...

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Problems solved by technology

[0004] The purpose of the present invention is: when controlling the stiffness of a railway cable-stayed bridge, a group of bridge structures with different stiffnesses and the same other parameters are usually formulated in the prior art, and then the stiffness limit that meets the safety and comfort requirements of the researched vehicle is obtained, Aiming at the problem that it is impossible to analyze the change of bridge stiffness caused by the change of the bridge's own structural parameters, a method for controlling the stiffness of a long-span railway bridge by staying cables is provided. The structural parameters of the bridge itself are used to analyze the stiffness change characteristics of the bridge, and the sensitivity characteristics of the cables are obtained, so that the overall stiffness of the railway long-span cable-stayed bridge can be controlled through the stiffness of the cable-stayed cables, so that the stiffness control technology of the long-span railway bridge can be realized. Breakthrough, solved the technical problem that the rigidity is difficult to control, promoted the promotion of railway long-span cable-stayed bridges, and saved a lot of engineering investment costs

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