大跨度外倾非对称式系杆拱桥施工控制研究

发布时间：2018-12-27 19:33

【摘要】：随着我国社会经济的快速发展,桥梁建设的规模变得越来越大,大跨度以及结构复杂的桥梁正在被越来越多地规划和建造着,其中大跨度外倾非对称式系杆拱桥,结构新颖、外形优美,已被广泛地应用于城市景观桥梁中。大型复杂桥梁的整个施工过程中结构体系转换较多,为了实现桥梁成桥状态下结构的线形状态和应力状态逼近理想的成桥状态,需要对整个桥梁建设过程制定科学合理的施工监控体系。大跨度外倾非对称式系杆拱桥,结构复杂,施工步骤繁多,其合理的内力状态与理想的线形状态不但与设计有关,而且还要依靠科学合理的施工方法来实现。对于采用支架法施工的大跨度外倾非对称式系杆拱桥,钢箱拱肋与钢梁的拼装、支架的拆除顺序以及吊杆、系杆的张拉顺序是一个非常复杂的过程,为了保证最终成桥下结构构件的线形状态和应力状态满足设计要求,对桥梁的整个施工过程进行监控是非常必要的。本文以成都市跨府河桥为工程背景,对施工过程中桥梁结构的变形和应力进行仿真计算分析,并且对该桥制定了合理的施工监控方案。采用桥梁专业软件Midas/Civil建立全桥有限元模型,根据实际施工过程进行仿真模拟计算分析；采用Ansys有限元分析软件建立钢-混结合段局部模型,对钢-混结合段进行应力分析。通过施工过程中现场实际数据与理论计算的数据进行对比分析,并运用综合控制方法进行施工监控,对设计初期参数进行反复的修正和调整,以更准确地模拟桥梁结构的真实情况,并且把理论计算数值运用到下一阶段的施工控制中,最终保证桥梁结构构件的线形状态和应力状态满足设计要求。
[Abstract]:With the rapid development of social economy in our country, the scale of bridge construction is becoming larger and larger. Bridges with large span and complicated structure are being planned and built more and more. Beautiful appearance, has been widely used in urban landscape bridges. In order to realize the linear state and stress state of the bridge under the condition of bridge completion, there are many structural system changes in the whole construction process of the large and complex bridge. It is necessary to establish a scientific and reasonable construction monitoring system for the whole bridge construction process. The structure of large span extraverted asymmetric tied arch bridge is complicated and the construction steps are various. Its reasonable internal force state and ideal linear state are not only related to the design but also depend on scientific and reasonable construction methods. It is a very complicated process for the long span externally tilted asymmetric tied arch bridge, the assembling of steel box arch rib and steel beam, the removal order of support and the tension sequence of suspender and tie bar. In order to ensure that the linear state and stress state of the structural components under the bridge finally meet the design requirements, it is necessary to monitor the whole construction process of the bridge. In this paper, the deformation and stress of the bridge structure in the construction process are simulated and analyzed, and a reasonable construction monitoring scheme is made for the bridge under the background of the bridge across the Fuhe River in Chengdu. The finite element model of the whole bridge is established by using the bridge professional software Midas/Civil, and the simulation calculation and analysis are carried out according to the actual construction process. The local model of steel-concrete joint section is established by using the Ansys finite element analysis software, and the stress analysis of the steel-concrete joint section is carried out. Through the comparison and analysis between the actual data of the site and the data calculated in theory during the construction process, the construction monitoring is carried out by using the comprehensive control method, and the parameters of the initial design are revised and adjusted repeatedly. In order to simulate the real situation of the bridge structure more accurately and apply the theoretical calculation value to the construction control in the next stage, the linear state and the stress state of the bridge structure members can meet the design requirements.
【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

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