Research on Nonlinear Seismic Responses of Isolated Bridges Based on Bi-direcation Coupled Interaction of LRB Restoring Force

In order to investigate the different influences of taking into and taking no account of bi-directional couple for LRB restoring force interaction on structure seismic response,the Bouc-Wen model is adopted to simulate the bi-directional couple interaction for LRB restoring force,the Wen model is adopted to simulate the single-directional for LRB restoring force,the two FEA models which involved the taking into and taking no account of bi-directional couple interaction for LRB restoring force are established,the multi-dimensional and multi-support random excitation as input for two models,the time-history analyses procedure of the Newmark and the Runge-Kutta iterative strategy are used to solve the increment form nonlinear governing equation of motion is programmed.Using the procedure and combining calculation example analyses the two models between the taking into and taking no account of bi-directional couple interaction for LRB restoring force.The consequences indicate that the girder displacement and LRB displacement can be underestimated by the taking no account of bi-directional couple interaction for LRB restoring force.The pier top displacement,girder acceleration and pier bottom internal force can't be overestimated by the taking into bi-directional couple interaction for LRB restoring force.