Effect of seismic conditions on pounding response of expansion joint in a curved bridge

Aiming at the pounding damage of expansion joint in a curved bridge under earthquake,and relying on the project of a single multi-unit long curved bridge in a multilevel junction system,the paper built space dynamic model of a curved bridge with expansion joint,and simulation of pier column,beam,bearing and expansion joint.The Kelvin contact element was used to simulate the pounding between expansion joints.Using nonlinear time history analysis method,the paper analyzed the different pounding responses under eight different types of seismic condition(two groups of seismic acceleration record were combined by one-dimension or multi-dimension seismic input direction).The result shows that the seismic response of different direction in a curved bridge is coupled,so the study on expansion joint seismic pounding response of a curved bridge should adopt one-dimension and multi-dimension seismic input direction and multifarious seismic waves.