【摘要】 以西禹高速公路杏沟连续刚构桥为研究对象,采用ANSYS有限元程序,并考虑边跨支座处的弹性约束作用,建立了该连续刚构桥动力计算的整体空间有限元计算模型,探讨了连续刚构桥采用钢筋混凝土四柱式桥墩、双薄壁空心墩、单薄壁空心墩及独柱实心墩时的动力性能。计算结果表明:4类桥梁自振频率依次增大,四柱式桥墩和双薄壁空心墩的桥梁振动以桥墩弯曲为主,单薄壁空心墩和独柱实心墩的桥梁振动以桥面弯曲为主;在不同地震波作用下,由于地震波的卓越周期以及结构自振特性等不尽相同,4类结构的动力反应也不尽相同。更多还原

【Abstract】 Regarded Xinggou Continuous Rigid Frame Bridge on Xiyu Expressway as research object,in consideration of the effect of elastic restraint in side span bearing,the finite element program ANSYS was used to establish the overall spatial finite element calculating model of the bridge.Dynamic characteristics of the continuous rigid frame bridge with reinforced concrete tetrastyle bridge pier,the double thin wall hollow pillar,the frail wall hollow pillar and the alone column solid pillar were discussed.The calculation results indicate that four kinds of bridge self-vibration frequencies increase in turn.The expressions of bridge vibrations of the reinforced concrete tetrastyle bridge pier and the double thin wall hollow pillar are bridge pier curving primarily.The expressions of bridge vibrations of the frail wall hollow pillar and the alone column solid pillar are bridge floor curving primarily.Because predominant period of the seismic wave as well as the structure self-vibration characteristic are different,four kinds of structural dynamic responses are also different under different seismic wave actions.更多还原