双塔组合梁斜拉桥施工全过程静力分析

发布时间：2018-04-15 06:07

本文选题：斜拉桥 + 组合梁　；参考：《西南交通大学》2015年硕士论文

【摘要】：随着桥梁技术的发展和社会进步的需要,斜拉桥凭借其独特的结构和优良的性能在当今桥梁建设中得到了大力发展,尤其是在大跨度桥梁中应用更为广泛。目前正在建设的临海灌河斜拉桥采用了三跨连续半漂浮双塔组合梁结构的设计,主跨径400米,属于比较典型的双塔斜拉桥结构。由于结构跨径大,桥梁结构中的几何非线性效应较明显,同时由于主梁采用组合梁结构,混凝土的收缩徐变也将对桥梁施工阶段以及成桥状态下受力情况产生不可忽视的影响。论文以在建中的灌河斜拉桥为背景,主要介绍了斜拉桥中的非线性理论,同时对斜拉桥几何非线性主要影响因素进行了简单讨论,混凝土收缩徐变的相关理论以及组合梁结构的相关计算方法作也做了简要介绍,并给出了程序中组合梁结构相关计算原理和公式,文中对局部桥面板应力也作了一定的分析。斜拉桥的施工包括多个施工阶段,施工工期长,在施工过程中结构体系的转换较为频繁,加上在过程中不可预见的因数众多,且成桥状态下主梁的线形以及结构内力情况与施工步骤以及施工工艺密切相关,因此与成桥状态相比斜拉桥施工过程中的结构特点和受力特性更值得关注。论文中采用有限元计算分析软件Midas Civil对灌河斜拉桥建立了平面杆单元模型,并在其基础上对全桥施工过程进行了仿真计算分析和参数敏感性分析以及局部混凝土桥面板的分析,最后得出相关结论并为该桥的建设提出有利的建议。
[Abstract]:With the development of bridge technology and the need of social progress, cable-stayed bridges have been developed greatly with their unique structure and excellent performance, especially in long-span bridges.The three-span continuous semi-floating double-tower composite beam structure is adopted in the construction of the cable-stayed bridge of Linhai Guanhe River at present. The main span is 400 meters, which belongs to the typical double-tower cable-stayed bridge structure.Because of the large span, the geometric nonlinear effect in the bridge structure is obvious. At the same time, because the main beam adopts the composite beam structure, the shrinkage and creep of the concrete will also have an unnegligible influence on the bridge construction stage and the stress situation under the state of the bridge.In this paper, the nonlinear theory of the cable-stayed bridge is introduced, and the main influence factors of the geometric nonlinearity of the cable-stayed bridge are briefly discussed.The related theory of concrete shrinkage and creep and the calculation method of composite beam structure are also briefly introduced, and the principle and formula of the calculation of composite beam structure in the program are given, and the local bridge deck stress is also analyzed in this paper.The construction of cable-stayed bridge includes many construction stages, the construction period is long, the structural system is changed frequently in the construction process, and there are many unpredictable factors in the construction process.The alignment and internal force of the main girder are closely related to the construction steps and construction technology, so the structural characteristics and mechanical characteristics of cable-stayed bridge during construction are more worthy of attention than the completed state.In this paper, the plane bar element model of Guanhe cable-stayed bridge is established by using the finite element analysis software Midas Civil. On the basis of this model, the whole bridge construction process is analyzed by simulation calculation, parameter sensitivity analysis and local concrete deck slab analysis.Finally, the paper draws the relevant conclusions and puts forward some favorable suggestions for the construction of the bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.27

【相似文献】