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为深入认识不对称连续刚构的不对称性所引起的结构力学特性,引入不对称连续刚构不对称系数的概念,确定该系数的合理范围以保证结构的合理性。将已建成贵州思南县岩头河大桥结构的大T构对称形成对称连续刚构,从该对称刚构中一个T构的主梁根部依次对称去掉悬浇节段,形成20个不同的不对称系数模型,(含对称结构)。对模型进行适当假定与简化,采用大型有限元软件Midas/Civil,计算得出跨径不对称下连续刚构在自重、活载、系统升温、基础沉降及各工况组合下的支点反力,并得出结构在各工况及各应力组合下的应力。分别对比分析了支点反力和应力在不对称系数变化下的变化规律,确定出不对称连续刚构的不对称系数合理取值范围为0.4≤η≤1.0,对不对称连续刚构在实际工程中的应用具有一定指导意义。
In order to understand the structural mechanics characteristics caused by the asymmetry of asymmetric continuous rigid frame, the concept of asymmetric continuous rigid frame asymmetry is introduced to determine the reasonable range of the coefficient to ensure the structural rationality. The large T-structure that has been built in the structure of the Yantouhe Bridge in Sinan County of Guizhou is symmetrically formed into a symmetrical continuous rigid frame. From the symmetrical rigid frame, the root of a T-shaped main beam is symmetrically removed to form the suspension section, forming 20 different Symmetry coefficient model, (including symmetrical structure). With appropriate assumptions and simplifications of the model, large-scale finite element software Midas / Civil was used to calculate the reaction force of the fulcrum of the continuous rigid frame under the asymmetry of cross-span under self-weight, live load, system temperature increase, And draw the structure under various conditions and stress combinations. The changing regularities of the reaction force and stress of the fulcrum under the asymmetry coefficient are analyzed respectively. The reasonable value range of the asymmetry coefficient of the asymmetrical continuous rigid frame is determined to be 0.4≤η≤1.0, and the unsymmetrical continuous rigid frame in the actual project In the application of a certain significance.