【摘要】 针对曲线箱梁桥的地震响应,结合某城市一座立交匝道高架曲线箱梁桥的工程实例,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,研究了曲线箱梁桥的动力特性.选取E1 Centro地震波并考虑两种工况组合进行了地震时程分析,给出了曲线箱梁和桥墩的内力、位移时程响应,并与反应谱法的计算结果进行了比较.结果表明:低阶振型对桥墩的弯扭变形影响较大,反应谱法的计算结果偏小.更多还原

【Abstract】 Aiming at the seismic response of curved box-girder bridges and taking a urban overpass ramp curved box-girder bridge as an engineering example,the dynamic calculating model of the curved box-girder bridge was created using the finite element analysis program ANSYS.The seismic response and dynamic characteristic of the curved box-girder bridge were discussed.And the seismic time history analysis under two operating conditions was conducted for the curved box-girder bridge subjected to the E1 Centro earthquake wave.The internal force,displacement and time history responses of the curved box-girder and bridge pier were obtained and compared with the calculated results of response spectrum method.The results indicate that the lower frequency modes of vibration have significant influence on the bending and torsion deformation of bridge pier.The calculated results of response spectrum method are the smaller.更多还原