【摘要】 对于目前在城市立交和高架桥建设中应用广泛的多跨连续曲线箱梁桥,不考虑地震动行波效应的影响已经不能满足工程抗震的需要。针对一座七跨连续曲线箱梁桥考虑行波效应时的地震反应,采用大型有限元分析程序ANSYS,选取空间梁单元建立动力计算模型,研究了连续曲线箱梁桥的动力特性;并选取了E1 Centro地震动,考虑三种工况组合进行了多点激励与一致激励下的地震时程反应分析,给出了曲线箱梁和桥墩的内力、位移时程反应。结果表明:桥墩的刚度对连续曲线箱梁桥的动力特性影响较大,低阶频率和振型对桥墩变形的影响明显大于曲线箱梁;连续曲线箱梁桥在多点激励与一致激励下的地震反应差别较大。更多还原

【Abstract】 For multi-span continuous curved box-girder bridge in urban viaduct and interchange construction,if we do not consider the effects of traveling wave,the seismic checking can not be satisfied.Aiming at seismic responses of a seven-span continuous curved box-girder bridge,the dynamic calculating model of the continuous curved box-girders bridge is made by the finite element analysis program ANSYS.The dynamic characteristics of the continuous curved box-girders bridge are discussed,and the time history analysis is performed for the continuous curved box-girders bridge subjected to E1 Centro earthquake ground motion in three conditions with non-uniform excitations and uniform excitation.The internal force,displacement and the time history responses of the curved box-girders and bridge pier are obtained.The results indicate that the stiffness of the bridge pier have considerable influence on the dynamic characteristics of the continuous curved box-girders bridge.The lower frequencies and modes have significant influence on the bending and torsional deformation of the bridge pier.The seismic responses of the continuous curved box-girder bridge with non-uniform excitations and uniform excitation have larger difference.更多还原