Seismic Collision Response Analysis Of Complex Interchange Bridge Based On Precise Integration Method

The investigation found that the damage caused by the collision of bridge structures under earthquakes is not negligible and very common for seismic design.This paper mainly studies the related effects of beam end collisions on bridge structures themselves under complex seismic loads.Due to the limitations of the algorithm itself,the traditional calculation method has difficulty in convergence or low calculation accuracy when solving collision problems.Because the precision integration algorithm has the advantages of high precision and unconditional stability,this paper studies the collision response of the high and low pier and the curve ramp bridge of the urban overpass by using the precise integral collision algorithm developed in MATLAB environment.The specific work in ELudes the following:(1)Abstracting a simplified mechanical model for collision problems,establishing a balance equation considering collision and unconsidered collision,and deriving the calculation flow of the precise integration method considering both collision and untested collisions,in MATLAB environment A fine integration algorithm that considers the separation-collision state transition is implemented to achieve calculations for both collision and unconsidered collisions.(2)Based on the precise integration algorithm,the time-history response analysis of the high and low pier bridges is carried out.The difference between the collision and the structural response under the collision is considered.The damping ratio,the expansion joint width and the pier are studied.The influence of factors such as height and restoring force coefficient on the collision results shows that there are differences in the collision force between the upper and lower roof plates of the expansion joint box girder.(3)Based on the contents of the previous chapters,the related time-history reaction studies were carried out on the collision response of curved bridges.Contrasting studies on the response of curved bridges without considering collisions and considering collisions are considered respectively.Firstly,the effects of different incident angles on the collision of curved bridges are studied.The influence of the impact force on the shear force,bending moment and pier top displacement of the pier pier is also studied.Studies have shown that there are differences in the collision forces between the inner and outer sides of the curved bridge expansion joint.The research results have certain reference value for the collision control of high and low pier bridges with slopes in complex urban bridges and the seismic design of curved bridges considering collisions.