矮塔斜拉桥参数敏感性分析及拉索损伤研究

发布时间：2018-01-05 23:07

本文关键词：矮塔斜拉桥参数敏感性分析及拉索损伤研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：矮塔斜拉桥是介于连续梁与斜拉桥之间的一种新型结构体系，由于其结构性能优越、施工方便及外形美观，因此得到了迅速的发展。本文以国内的一座矮塔斜拉桥为工程实例，针对结构的参数敏感性及拉索损伤状态下结构的受力特性展开相关研究，主要内容有：（1）依据某大桥的实际施工过程，建立了大桥的有限元分析模型，得到了施工最大悬臂阶段及成桥状态下结构的变形及受力情况，验证了设计的合理性。然后选取主梁容重、主梁弹性模量及锚下控制应力等八个参数作为研究对象，通过改变选取参数的大小，研究参数改变对结构成桥及运营阶段的影响，确定了能显著影响结构受力行为的参数，为今后同类桥梁的施工及本桥后期的监测养护提供参考。（2）分析了引起矮塔斜拉桥拉索损伤的主要因素，在上述有限元程模型分析的基础上，对不同位置的拉索断裂进行模拟，分析研究了拉索断裂引起的大桥线形、主梁内力、拉索索力等结构参数的静力变化特征以及全桥结构的动力变化特征，对将来的换索工作有一定参考价值。（3）以参数敏感性分析及拉索断裂后结构受力性能分析为基础，结合人工检测、经验分析，提出了某大桥的健康监测测点布置方案。文章最后对研究工作进行了简单的总结，给出了一些结论，，并针对目前的研究情况指出了有待进一步研究的问题。
[Abstract]:The short tower cable - stayed bridge is a new kind of structural system between continuous beam and cable - stayed bridge . Because of its superior structure , convenient construction and beautiful appearance , this paper studies the structural parameters sensitivity and the stress characteristics of the structure under the condition of cable damage . The main contents are as follows : ( 1 ) Based on the actual construction process of a bridge , the finite element analysis model of the bridge is established , the deformation and the stress of the structure under the condition of the maximum cantilever and the bridge are obtained , and the rationality of the design is verified . Then the influence of the parameter change on the bridge and the operation stage of the structure is selected by changing the size of the selected parameter , the parameters of the structural stress behavior can be significantly influenced , and the reference for the construction of the similar bridge and the monitoring and maintenance in the later stage of the bridge is provided . ( 2 ) The main factors of cable damage caused by cable - stayed bridge are analyzed . Based on the analysis of the finite element range model , the cable faults at different locations are simulated . The static characteristics of the structure parameters such as bridge alignment , internal force of main beam , tension and so on are analyzed , and the dynamic variation characteristics of the whole bridge structure are analyzed . ( 3 ) Based on the analysis of the parameter sensitivity and the analysis of the stress performance of the structure after the cable breaking , the plan of the monitoring and measuring points for the health monitoring of a bridge is put forward based on the analysis of artificial detection and experience . In the end , the paper makes a brief summary of the research work , gives some conclusions , and points out the problems to be further studied in the light of the current research situation .

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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