Calculation method of dynamic response of flyover under non-uniform excitation

Abstract

The invention relates to a computing method of dynamic response under nonuniform excitation of an overline overbridge. The computing method of dynamic response under the nonuniform excitation of the overline bridge relates to the computing method of dynamic response of the overline pedestrian overbridge under the action of the nonuniform excitation of a main-line train, the dynamic response of the overline pedestrian overbridge serves as a target value, considering that the nonuniform excitation is generated at the position of a bridge pier of the overline pedestrian overbridge during the high-speed running process of the train, the equation of motion of the overline pedestrian overbridge under the action of the nonuniform excitation is deduced, and the response of the overline pedestrian overbridge under the action of the train can be obtained according to a numerical integration. According to the computing method of dynamic response under the nonuniform excitation of the overline bridge, the analytic method of the nonuniform excitation is brought out creatively to be used for calculating the vibration response under the nonuniform excitation acting on the position of the bridge pier of the overline pedestrian overbridge when the main-line train passing through at a high speed under the overline pedestrian overbridge, the computing method of dynamic response under the nonuniform excitation of the overline bridge is suitable for dynamic response analyses of all overline pedestrian overbridges under the action of the main-line trains and has a comparatively large practical engineering application value and innovativeness.

Description

technical field [0001] The invention relates to the civil engineering structure collar of the transportation industry, in particular to a calculation method applicable to the dynamic response of a flyover bridge under non-uniform excitation. Background technique [0002] The inbound pedestrian bridge is an important infrastructure in railway passenger transportation. When the main line trains pass under it at high speed and frequently, due to the strong effect of the train wind load and foundation vibration generated by the high-speed train operation, its vibration response Obviously, it will seriously affect its safety, comfort and durability. Therefore, it is necessary to study the dynamic response of the inbound pedestrian bridge when the main line train passes at high speed. [0003] At present, the existing research mainly focuses on the dynamic response of the cross-line pedestrian bridge structure caused by the wind load of the train, and does not consider the influen...

AI Technical Summary

Problems solved by technology

However, in this patent, when the high-speed train passes directly under the pedestrian bridge, the environmental vibration is transmitted to the foundation of the bridge along different directions. Therefore, the current consistent excitation analysis method is no longer suitable for the environmental vibration analysis of the pedestrian bridge. applicable, the non-uniform excitation analysis method must be used to reasonably calculate the vibration response of the pedestrian bridge

Images