Collapse Analysis Considering Shear Deformation For Bridge

Bridge plays an important role in the urban traffic,and it is a major project of urban earthquake disaster prevention.The analysis of bridge collapse mode under seismic has a certain significance.At present,the numerical analysis model of the reinforced concrete hollow thin-walled pier include fiber unit and entity element,fiber units can’t consider the shear deformation of piers,while the efficiency of entity unit model is low,and the entity unit model is difficult to convergence.Multi-layer shell element can simultaneously consider coupled effect of the in-plane bending,shear,and horizontal bending,and the analysis efficiency is higher,it has certain advantage when simulate hollow piers,this paper completed the following work:(1)Based on the existing test,established the numerical model of reinforced concrete hollow pier with multi-layer shell element and entity unit,through two models to calculate the hysteretic curve and skeleton curve,compared the results with the test results,verified the correctness and efficiency of the hollow piers based on multi-layer shell element.(2)Respectively using multi-layer shell element and beam element to simulate the hollow pier,established the model considering shear deformation and the model without the shear deformation,analyzed seismic time history response of the two models by dynamic time history analysis,obtain the influence of shear deformation for the seismic responses of the bridge.(3)Respectively based on the multi-layer shell element and beam element,established the collapse simulation model considering shear deformation and the model without the shear deformation,and simulated the failure process of two models.Compare the collapse damage of the two models,obtain the influence of shear deformation for the collapse damage of the bridge.