Calculation and analysis of seismic response of long-span continuous curved box girder bridges
In order to research dynamic response of continuous curved box girder bridges with multi-span under seismic action,the vibration equation of curved box girder bridges was established based on virtual work principle and dynamic finite element theory.The spatial finite element model of the whole bridge was established by using ANSYS to verify the effectiveness of the theoretical numerical model to solve the vibration equation.For a continuous curved box girder bridge with three spans under the action of El-centro waves,considering four kinds of seismic excitation conditions,the seismic time-history response of the bridge is calculated and analyzed by using the Newmark-β method in MATLAB.The results show that the dynamic response of pier columns present obvious spatiality,the peak displacement and acceleration increase 72.7％and 145.7％,respectively,under bi-directional coupling horizontal seismic action compared with those under unidirectional horizontal seismic action.The maximum seismic response is not necessarily along the seismic wave input direction,and the most unfavorable input angle of seismic waves is 50°.The transverse response of the long-span continuous curved bending beam bridge is large,and it is easy to cause the collapse of the transverse bridge beam at both ends.
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