大跨度铁路上承式拱桥列车走行性研究
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摘要
大跨度上承式拱桥是一种应用范围较广的桥型,其优美的造型、强大的跨越能力使它在铁路桥梁中占有一席之地。本文以丽江至香格里拉新建铁路上的金沙江特大桥为工程背景对上承式拱桥进行了车桥耦合振动分析。全文主要研究内容如下:
     1.综述了大跨度上承式拱桥的发展概况,回顾了国内外车桥振动研究的发展历程,阐述了上承式钢拱桥车—桥耦合振动系统分析的必要性。
     2.基于弹性系统动力学总势能不变值原理及形成矩阵的“对号入座”法则建立了上承式钢拱桥的有限元模型,对该桥进行了自振特性分析。
     3.基于以上分析模型,详细计算了不同工况下车桥系统的振动响应,对桥梁及列车的动力响应做出了评价,得出结论:金沙江特大桥具有良好的动力特性及列车走行性。
     4.研究了桥梁各部分刚度对车桥系统动力特性的影响,计算结果表明:①在一定范围内提高桥面系刚度可以有效减少桥梁的振动动力响应。②拱上支撑墩刚度对列车桥梁振动响应的影响较小。③拱圈刚度对桥梁位移响应最大值的影响相对于其他构件刚度要大的多,提高拱圈刚度可以有效减小桥梁位移响应。④在拱圈中,拱肋刚度相对于联结系刚度对桥梁振动位移响应作用更大。提高拱肋刚度是一种减小桥梁振动位移的有效手段。
Span deck arch bridge has a wider range of applications; its graceful shape and strong ability make it beyond other railway bridges. With the Jinshajiang Bridge of the Lijiang-Shangri-La new railway as engeneering background, this paper makes a study of the vehicle-bridge coupling vibration of deck arch bridge. The works completed in this paper are as the following:
     1. With the summary of the development of the span deck arch bridge, vehicle-bridge coupled vibration and vehicle-bridge coupled vibration at home and abroad, it describes the necessity of the study on vehicle-bridge coupled vibration systems.
     2. Based on the principle of total potential energy with stationary value in elastic system dynamics and the "set in right position" rule for formulating system matrixes, the finite element model of deck steel arch bridge is established. And the natural vibration characteristics are analyzed.
     3. Based on the above analysis models, the dynamic responses of the vehicle-bridge system under different conditions are analyzed. And we could come to the conclusion as follow:Jinsha River Bridge has good dynamic characteristics and train running property.
     4. The dynamic responses of the vehicle-bridge system on different bridge system stiffness are analyzed.We could come to the conclusion as follow:①Increasing the stiffness of bridge deck system in a certain range can reduce the bridge dynamic response.②The stiffness of piers on arch has not a great impact on bridge and train vibration responses.③Compared with other parts of bridge, arch ring's stiffness has a great impact on the maximum of bridge displacement responses. Increasing the stiffness of arch ring can reduce the displacement response of the bridge In effect.④Compared with sway bracing, the arch ribs'stiffness has a great impact on bridge vibration displacements. Increasing the stiffness of arch ribs is an effective means of decreasing vibration displacement.
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