单索面大挑臂斜拉桥非线性稳定性研究

发布时间：2018-01-05 19:04

本文关键词：单索面大挑臂斜拉桥非线性稳定性研究　出处：《东北林业大学》2015年硕士论文　论文类型：学位论文

【摘要】：斜拉桥以超强跨越能力、美观的外形等诸多优点而成为现代桥梁工程中发展最迅速、最具竞争力的桥型之一。大跨度斜拉桥整体和局部构件的稳定性成为了斜拉桥计算中的关键,也是制约超大跨斜拉桥发展的因素之一。本文以黑瞎子岛乌苏斜拉桥为工程背景,基于非线性理论和稳定分析理论,通过对该桥进行的有限元仿真分析,对大挑臂单索面钢箱梁斜拉桥的非线性因素影响敏感性和结构的稳定性进行研究,主要内容包括：1、通过乌苏斜拉桥有限元计算,分析自重、二期恒载及运营活载作用阶段下各几何非线性影响因素对结构内力和变形的影响程度。结果表明在自重和二期恒载施工阶段,斜拉索的垂度效应产生的非线性影响最明显,而在行车活载阶段,大位移效应成为对斜拉桥计算结果影响最明显的参数。2、通过有限元计算,分析了成桥运营阶段整体结构的线弹性和非线性两类稳定问题,并对比几何非线性和材料非线性对稳定性分析结果的影响程度。此外,还分析了不同主塔横截面尺寸对桥梁整体及局部桥塔的稳定性影响；通过对关键部位构件的细化分析模型,研究了索梁锚固区、索塔锚固区及箱梁长挑臂的局部力学性能和稳定性。计算结果表明乌苏斜拉桥最小稳定系数计算结果为6.513,其整体及局部构件的稳定性是足够的。3、结合乌苏斜拉桥实桥荷载试验,总结了静、动载状况下荷载试验测试结果。在评价桥梁结构实际状态承载能力和振动特性的同时,实测结果数据也验证了有限元模拟计算数据的正确性和合理性。
[Abstract]:The cable-stayed bridge has become the most rapid development in modern bridge engineering because of its many advantages such as super span ability beautiful shape and so on. One of the most competitive bridge types, the stability of the whole and local components of the long-span cable-stayed bridge becomes the key to the calculation of the cable-stayed bridge. It is also one of the factors that restrict the development of super large span cable-stayed bridge. In this paper, based on the nonlinear theory and stability analysis theory, the finite element simulation analysis of the bridge is carried out based on the engineering background of Hexiaizi Island Wusu cable-stayed bridge. The influence of nonlinear factors on sensitivity and structural stability of steel box girder cable-stayed bridge with large cantilever single cable plane is studied. The main contents include: 1, through the finite element calculation of Wusu cable-stayed bridge, the deadweight is analyzed. The degree of influence of geometric nonlinear factors on the internal force and deformation of the structure under the second stage of dead load and the operation stage of live load. The results show that in the stage of deadweight and second stage of dead load construction. The nonlinear effect of cable sag effect is the most obvious, but in the stage of moving load, the large displacement effect becomes the most obvious parameter. 2, which is calculated by finite element method. In this paper, the linear elastic and nonlinear stability problems of the whole structure in the operation stage of the bridge are analyzed, and the influence of geometric nonlinearity and material nonlinearity on the stability analysis results is compared. The influence of different cross section size of main tower on the stability of bridge whole and local tower is also analyzed. The Anchorage zone of cable beam is studied through the detailed analysis model of the key parts. The local mechanical properties and stability of cable tower Anchorage zone and long cantilever of box girder are calculated. The calculated results show that the minimum stability coefficient of Wusu cable-stayed bridge is 6.513, and the stability of the whole and local members is sufficient. 3. Combined with the load test of Wusu cable-stayed bridge, the load test results under static and dynamic load conditions are summarized, and the load bearing capacity and vibration characteristics of the bridge structure are evaluated at the same time. The measured data also verify the correctness and rationality of the finite element simulation data.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27

【引证文献】