【作者】 李智宇；

【导师】 黄平明； 梅葵花；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2006， 硕士

【摘要】 悬索桥以其强大的跨越能力和优美的外观在桥梁建设中得到了广泛的应用。为了适应一些特定的工程环境，出现了非对称式悬索桥。为了探索非对称式悬索桥(无塔、主缆不等高支承)行之有效的设计方法，本文以湖北省兴山县峡口镇利方岩村人行悬索桥为背景，分析了对称式悬索桥与非对称式悬索桥结构性能的差异，对非对称式悬索桥的结构受力特性和设计方法进行了研究，从而得到对非对称式悬索桥的设计具有一定指导意义的结论。 悬索桥在竖直荷载下的分析计算，是悬索桥设计计算中最重要的内容，是主要构件设计的最重要依据。首先，本文运用理论分析方法，对竖直荷载作用下主缆线形为抛物线的非对称式悬索桥进行了静力分析。推导了非对称式悬索桥弹性理论的内力计算公式，并对比了其与对称式悬索桥弹性理论的内力计算公式的异同；推导了非对称式悬索桥挠度理论的基本微分方程，并且给出了部分均布荷载作用下基本微分方程的试算方法；提出了挠度理论的几种简化计算方法。 其次，利用大型通用有限元分析程序ANSYS对非对称悬索桥进行了非线性静力分析。通过建立一系列的有限元计算模型，更为精确地计算了竖直荷载作用下的结构状态，分析了敏感性参数m(主缆支点高差与主缆跨度的比值)对竖直活载作用下结构反应的影响，得到了一些有益的结论。 最后，利用有限元程序ANSYS对非对称悬索桥进行了模态分析，分析了敏感性参数m对结构前六阶振型及其相应频率的影响。更多还原

【Abstract】 The application of the suspension bridge is very wide because of its great spanning ability and aesthetic appearance. To adapt to some special engineering situation, the asymmetry suspension bridge appears. To search the effective design methods for the asymmetry suspension bridge (no towers, the height of the two supports of the flexible cables are unequal), based on the Lifangyan village pedestrian bridge in Xinshan country of Hubei province, the differences of structural properties between the normal suspension bridge and the asymmetry suspension bridge were analyzed. The properties and the design methods of asymmetry suspension bridges were researched, and several directive results for the design of asymmetry suspension bridges were obtained.The analysis of the suspension bridge under vertical loads is the most important content during the course of the design; it is the most important foundation for the design of the main components of the bridge. First, theoretical analysis methods were used for the static analysis of the suspension bridge. The formulas for endogen force of the asymmetry suspension bridge through elastic theory were deduced and they were contrasted with those of the normal suspension bridge. The basic differential equation of deflection theory was deduced and the method of getting the roots of the equation was offered, and some simplified methods for deflection theory were presented.Second, a nonlinear static analysis via the great finite element analysis programs ANSYS was carried out. By building a series of model, the states of the asymmetry suspension bridge under vertical live loads were calculated more precisely, and the effects of the sensitive parameter "m" (ratio of height difference between the supports and the span of flexible cables) to the structure response was analyzed.Last, a modal analysis via finite element analysis programs ANSYS was carried out and the effects of sensitive parameter "m" to the structure’s front six modes and corresponding frequency were analyzed.更多还原