【摘要】 龙潭河大桥采用连续刚构体系,其桥墩最高达178 m。采用BEAM3单元建立了该桥的动力分析有限元模型,计算了其自由振动频率及振动模态。利用ANSYS软件对该桥进行了弹性反应谱分析和时程反应分析,获得了该桥的地震反应内力。计算分析表明,不同地震波输入对桥梁的地震反应影响很大,El-Centro波输入下该桥的响应最大,竖桥向激励对结构的地震影响也不可忽略。更多还原

【Abstract】 The approach bridge of Longtanhe Bridge is five span PC continous rigid frame box girder bridge.The highest main piers comes to 178 m high.In this thesis,a finite element model of dynamic analysis for Longtanhe bridge is established by using the element of BEAM3,and its natural frequencies and mode properties are calculated.The elastic spectrum response and time-history analysis are made by use of the Software ANSYS,and the internal forces of the earthquake response are obtained.Conclusions are drawn under different seismic input,which indicate the seismic responses are related to seismic input directly and vertical seismic excitation is cannot ignored.更多还原