双车道稳定型悬索桥的力学性能研究

【作者】 张海洋；

【导师】 屈本宁；

【作者基本信息】 昆明理工大学 ， 工程力学， 2008， 硕士

【摘要】 本文是在现有的悬索桥研究成果的基础上,特别是针对稳定型悬索桥的研究成果基础上,建立双车道稳定型悬索桥有限元模型,并进行了静、动力响应分析,以及模态分析,探索了桥的力学特性,为该桥的设计提供参考。主要内容如下:一、综述了中外悬索桥及其理论的发展历程,介绍了稳定型悬索桥与一般悬索桥的区别和联系。二、阐述文中所应用的非线性有限单元理论,以及计算过程中使用的算法及计算公式等。三、根据稳定型悬索桥的结构特性及几何非线性特征选择适当的单元,建立双车道稳定型悬索桥有限元模型,并反复调试主缆的初始应变,得到最优值。四、考虑了结构的几何非线性,对双车道稳定型悬索桥在不同静载工况下的变形及内力分布情况进行了模拟计算,分析了桥的静力学特性及侧向稳定性,并与普通悬索桥对比,得到有价值的结论。五、应用Subspace Iteration法,计算了双车道稳定型悬索桥的固有频率及相应的振型,并依此为基础计算出索桥的结构阻尼,为动力响应分析提供数据。六、采用质量单元模拟动载的计算方法,实现了模拟车辆驶过双车道稳定型悬索桥的全过程,得到了双车道稳定型悬索桥的动力响应特征数据及各主要构件在动载作用下的变形特征或内力分布规律。论文研究结果表明:双车道稳定型悬索桥无论承受各工况的静载还是车辆过桥的动载,其整体变形、桥面侧向倾角、扭转角及主要构件的受力和变形均能控制在一定允许范围内,双车道的稳定型悬索桥是可行的。更多还原

【Abstract】 This research is based on the existing results of research on the suspension bridge,especially on the stable type suspended bridge. Two-lane stable type suspension bridge finite element model was established,and the bridge was studied about the response of static load and dynamic load.The bridge was to explore the mechanical characteristics,and this article provides the reference for this bridge design.The main content is as follows:1.The development course of Chineseand foreign suspension bridges was overviewed,at the same time,the progress of the calculation theory of the suspension bridge was also overviewed.The difference and the relation were introduced in this thesis-about the stable type suspension bridge and the common suspension bridge.2.It was explained that the non-linear finite element theory,and that the algorithms and calculation formula used.3.The elements be used for establishing the two-lane stable type suspension bridge finite element model were chosen according to the structure and geometry non-linear characteristics of the stable type stable suspension bridge.Initial strain of suspensions was repeatedly debugging for an optimum value.4.Had considered the structure geometry non-linearity,it was analyzed that the different states of two-lane stable type suspension bridge by Static Analysis.Has analyzed the bridge statics characteristic and the lateral stability,and with the ordinary hanging bridge contrast,obtains the practical significance result. 5.Subspace Iteration method used to calculate the natural frequency of the two-lane stable type suspension bridge and the corresponding vibration mode.And the results are calculated on the basis of the suspension bridge the structural damping for the dynamic response analysis of the data.6.Simulate the entire process of vehicles crossing the bridge,using the method that the dynamic load was simulated by mass element. Obtained the dynamic response characteristic data of the two-lane stable type suspension bridge,and acquired the deformation characteristics or distribution of internal forces under dynamic load function of each primary member.The paper findings indicated:the whole distorts,the bridge floor lateral inclinatio-nangle,and the stress and the distortion of primary member can be controlled in a certain permission scope,under the different states of static loads and dynamic load function.So the two-lane stable type suspension bridge is practical.更多还原