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桥墩形式对连续刚构桥动力特性的影响

, PP. 70-76

Keywords: 桥梁工程,连续刚构桥,有限元法,动力特性,桥墩形式

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Abstract:

？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。

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