【摘要】 曲线桥是现代交通中的一种重要桥型。与直线桥相比,曲线桥的自由振动与地震响应有着其自身的特点。文中运用有限元法,对曲线桥与直线桥的自振特性与地震响应作了对比分析。分析结果表明,曲线桥的以扭转为主的自振频率比直线桥高。在地震作用下,曲线桥上部结构的内力与直线桥相差不大;曲线桥竖向支座反力比直线桥小;曲线桥水平支座剪力比直线桥大。因此,在对曲线桥进行抗震设计时,上部结构可按直线桥进行设计,但应该准确计算其水平支座反力,并采取适当的支座抗剪措施。更多还原

【Abstract】 Curved girder bridge is an important bridge type in modern traffic engineering.Free vibration and seismic response feature of curved girder bridge is different from that of straight girder bridge.In this article,finite element method is used for comparative analysis in the respect of free vibration and seismic response feature between curved girder bridge and straight girder bridge.It is found that torsional modes’ frequencies of curved girder bridge are greater than that of straight girder bridge.Under earthquake,superstructure’s internal force of curved girder bridge is almost the same with that of straight girder bridge,the vertical support reaction of curved girder bridge is less than that of straight girder bridge,and the horizontal support shear force of curved girder bridge is greater than that of straight girder bridge.Therefore,the superstructure of the curved girder bridge can be designed as straight bridge in seismic design.However,the support shear force of curved girder bridge should be calculated accurately,and appropriate measures should be taken according to the support shear force.更多还原