山区大跨径人行索桥动力特性及振动控制方法研究

发布时间：2018-04-22 20:39

本文选题：大跨径人行索桥 + ANSYS　；参考：《重庆交通大学》2014年硕士论文

【摘要】：人行索桥作为悬索桥的一种，既拥有悬索桥的跨越能力大，造型美观的优点，又具有施工快速，经济性好，容易适应各种地形状况的优点。人行索桥充分发挥主缆以及吊杆受拉强度大的特点，在桥塔高度不高的情况下仍然可以保持很大的跨越能力，在我国的中西部山区以及众多旅游景区都有广泛的应用，在此类地区建设拱桥或者其他桥型不但施工的难度大，而且容易造成资源浪费，在景区则会造成与周边环境的不协调。人行索桥由于使用目的明确，与其他类型的桥梁相比，无疑是一种相对最优的选择。本文首先对人行索桥的研究背景以及现状进行说明，确定论文主要的研究方向，然后采用ANSYS有限元软件对大跨径人行索桥进行了参数化建模，采用控制变量法对各参数分别讨论，总结出了结构参数对于人行索桥的动力特性尤其是自振频率的影响，找出关键参数优化结构的动力性能，接着讨论在人行荷载和风荷载作用下的人行索桥振动问题并提出控制建议。抗风索是实际工程中广泛使用的振动控制措施，通过对实际工程项目进行模态化处理，研究在不同形式的抗风索条件下，人行索桥的结构动力响应位移以及自振频率的变化，总结出抗风索对不同跨径下人行索桥的振动控制效果，最后提出不同形式的抗风索在人行索桥中的使用条件，，为以后的人行索桥的设计提供了经验。
[Abstract]:As a kind of suspension bridge, the footbridge not only has the advantages of large span ability and beautiful shape, but also has the advantages of fast construction, good economy and easy to adapt to various terrain conditions. The cable bridge of the people's Bank of China can give full play to the characteristics of high tensile strength of the main cables and suspenders, and can still maintain a very large span capability even when the height of the bridge tower is not high. It has been widely used in the mountainous areas of the central and western regions of China and in many tourist scenic spots. The construction of arch bridges or other bridges in such areas is not only difficult to construct, but also easy to cause waste of resources, which will lead to disharmony with the surrounding environment in scenic areas. Compared with other types of bridges, the bridge is undoubtedly a relatively optimal choice because of its clear purpose. In this paper, the research background and current situation of the cable-bridge are explained, and the main research direction of the paper is determined. Then, the parametric modeling of the long-span footbridge is carried out by using ANSYS finite element software. The control variable method is used to discuss the parameters, and the influence of the structural parameters on the dynamic characteristics, especially the natural vibration frequency, of the footbridge is summarized, and the key parameters are found to optimize the dynamic performance of the structure. Then the vibration of the footbridge under the action of pedestrian load and wind load is discussed and the control suggestions are put forward. Wind resistant cable is a widely used vibration control measure in practical engineering. Through modal treatment of actual project, the dynamic response displacement and natural vibration frequency of footbridge are studied under different wind cable conditions. The effect of wind cable on vibration control of footbridge with different span is summarized. Finally, the application conditions of different types of wind resistant cable in pedestrian cable bridge are put forward, which provides experience for the design of footbridge in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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