矮塔斜拉桥施工控制及受力分析研究

发布时间：2018-02-27 23:03

本文关键词： 矮塔斜拉桥有限元应力线形索力　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：矮塔斜拉桥是由主梁、拉索和索塔组合而成的体系桥梁,从结构特性上来看矮塔斜拉桥是介于连续梁桥与斜拉桥之间的一种桥型,兼具连续梁桥的刚性和斜拉桥的柔性,在工程中具有很大的应用潜力。本文以某在建矮塔斜拉桥为研究背景,利用MIDAS CIVIL建立全桥有限元模型对其整体分析,利用MIDAS FEA进行局部分析。具体研究内容可以概括为以下几点:(1)用MIDAS CIVIL建立矮塔斜拉桥全桥模型,重点分析该矮塔斜拉桥在几个重要工况下的受力状况,为今后施工监控工作提供理论数据。(2)建立全桥完整模型与不包含下部结构的全桥简化模型,通过比较两种模型在最大悬臂状态下以及成桥状态下的主梁挠度、主梁应力,判断简化全桥模型的可行性与精准度。(3)对结构进行参数敏感性分析,为施工过程中采取的针对性措施并完成施工控制提供理论依据。(4)对提前拆除边跨满堂支架以及推迟拆除墩梁临时锚固工况进行有限元模拟,通过对比主梁竖向位移、主梁应力以及斜拉索索力的变化,确定提前拆除边跨满堂支架和推迟拆除墩梁临时锚固对整个桥梁受力状态以及线形的影响,为优化施工方案提供理论依据。(5)用MIDAS FEA软件建立托架有限元模型,计算0#块第一层混凝土硬化后承受自重荷载能力和已硬化成型的0#块第一层在浇筑0#块第二层过程中承担荷载能力,为托架优化设计提供理论依据。(6)用MIDAS FEA软件分别建立主塔J1索鞍区与J9索鞍区的有限元模型,研究索鞍区混凝土应力分布状态,分析出薄弱区。通过对比J9索鞍区简化模型与J9索鞍基准模型计算结果,验证了简化模型的可靠性和合理性。
[Abstract]:Low tower cable-stayed bridge is a system bridge composed of main beam, cable and cable tower. In terms of structural characteristics, the low tower cable-stayed bridge is a bridge type between continuous girder bridge and cable-stayed bridge. It has the rigidity of continuous beam bridge and the flexibility of cable-stayed bridge. It has great application potential in engineering. In this paper, the finite element model of the whole bridge is established by using MIDAS CIVIL to analyze the whole structure of a short tower cable-stayed bridge under construction. Using MIDAS FEA to carry out local analysis. The specific research contents can be summarized as follows: 1) using MIDAS CIVIL to establish the full bridge model of the cable-stayed bridge with low tower, the stress condition of the cable-stayed bridge with low tower under several important working conditions is analyzed emphatically. To provide theoretical data for construction monitoring and control work in the future, the complete model of the whole bridge and the simplified model of the whole bridge without the substructure are established. The deflection of the main beam and the stress of the main beam under the maximum cantilever state and the completed state of the bridge are compared between the two models. To determine the feasibility and accuracy of the simplified full-bridge model. In order to provide theoretical basis for the targeted measures taken in the construction process and complete the construction control, the finite element simulation is carried out on the condition of removing the side span full hall support in advance and delaying the removal of temporary anchoring of the pier beam, and the vertical displacement of the main beam is compared. The stress of the main beam and the change of the cable force are determined to determine the influence of removing the side span full hall support in advance and the temporary anchoring of the pier beam on the stress state and the linear shape of the whole bridge. The finite element model of bracket is established with MIDAS FEA software. The capacity of the first story concrete of 0# block to bear self-weight load after hardening and the loading capacity of the first story of the hardened block to bear the load in the process of pouring the second floor of the block of 0# are calculated. The finite element models of J1 cable saddle region and J9 cable saddle zone of main tower are established by MIDAS FEA software, and the stress distribution of concrete in cable saddle region is studied. The weak zone is analyzed and the reliability and rationality of the simplified model are verified by comparing the results of the simplified model of J9 cable saddle region with that of the reference model of J9 cable saddle.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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