Collision effect analysis method for bridge-track system under action of earthquake

Abstract

The invention discloses a collision effect analysis method for a bridge-track system under the action of earthquake. The collision effect analysis method comprises the following steps: (1) simulating non-linear constrain between a bridge and a track by adopting nonlinear beam elements or spring elements; (2) simulating the secondary dead load of the bridge by adopting a quality unit; (3) simulating a collision behavior of the bridge by adopting a spring to be connected with dampers in parallel and then connected with an interspace in series; (4) establishing steel rails with certain lengths outside the bridge; (5) simulating a sliding support by adopting a nonlinear spring; (6) simulating piers by adopting nonlinear fiber beam elements; (7) simulating the pile-oil interaction through equivalent-stiffness springs; (8) establishing great-quality units and applying acceleration time courses at pier bottoms to carry out uniform or non-uniform excitation. Compared with the prior art, the method considers the influence of a track structure on the earthquake response of the bridge, can analyze the earthquake response of the bridge-track system, and can also research the collision effect among the bridges; the analysis result meets the fact better.

Description

technical field [0001] The invention relates to structural vibration and impact analysis technology, in particular to a method for analyzing the impact effect of a bridge-track system under earthquake action. Background technique [0002] At present, seamless lines are generally laid on railway bridges. Under various loads, there is a nonlinear interaction between the bridge and the track. The bridge structure and the seamless line structure form a unified system. [0003] On the one hand, the continuous track structure is equivalent to the coupling beam device, which provides additional longitudinal constraints for the bridge. On the other hand, track structure consumes system capacity through non-linear hysteresis. Therefore, the influence of seamless track structure must be considered when conducting seismic response research of railway bridges. [0004] At present, when analyzing the dynamic response or collision effect of railway bridges under earthquake, most of them...

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