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中文摘要：
为了准确模拟预应力混凝土独塔斜拉连续刚构组合桥型的空间受力特性,以大型通用有限元程序为平台,采用相应的建模策略和二次开发技术,建立三维空间精细化基准有限元模型,在此基础上编制相应的计算程序,分析研究西江特大桥主桥独塔斜拉和连续刚构2种体系在组合结构中的受力性能及其作用.对比分析了其主梁考虑预应力和不考虑预应力2种情况下组合结构的自振特性.计算结果表明：独塔斜拉刚构体系整体表现出刚构的受力特性,斜拉索作为安全储备可对结构的“刚度保持”起到重要作用;主梁预应力效应改变了组合结构的刚度体系,对组合结构的自振特性具有一定的影响.
英文摘要：
In order to accurately simulate the static and dynamic characteristics of the single pylon continuous cable-stayed rigid-frame hybrid girder bridge, general finite element program is used to establish a precise three-dimensional space FE（finite element） modal.The strategy for space finite element model and corresponding development technology are firstly introduced.Based on it,computer program is compiled.The performance of static and dynamic characteristics and the role of the cable-stayed continuous rigid-frame structure in hybrid structure are analyzed in detail;a comparative analysis of the dynamic characteristics of the bridge is taken for the girders with or without consideration of prestressing.The calculation results show that the combination system bridge as a whole is characterized with the rigid frame loading characteristics type,the stay cable as reserve safety will play an important role for the ＂stiffness kept＂ of the structure,and prestressing effect of girder changes structural stiffness system,which has some influences on dynamic characteristics for hybrid structure.
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