拉索断裂对PC斜拉桥极限承载力的影响

发布时间：2018-01-13 03:36

本文关键词：拉索断裂对PC斜拉桥极限承载力的影响　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着斜拉桥在桥梁领域的迅速发展，其安全性和耐久性得到了广泛的重视。本文以某省斜拉桥为依托，建立了有限元模型，针对斜拉桥的拉索断裂损伤，对其极限状态下的安全储备能力进行了计算分析，具体内容如下： (1)本文分析了引起斜拉索损伤的主要原因，，主要介绍了化学行为和物理行为对拉索损失的影响，其中重点给出了风雨振动对于斜拉索的拉索损伤产生的影响。 (2)本文在查阅参考相关文献的基础上，通过对稳定问题的计算理论和极限承载力的计算方法的研究，采用有限元分析软件建立了数值模型，对空间有限元模型在不同荷载工况下的稳定问题进行了分析计算，并求得相应荷载工况下的稳定安全系数，计算了桥梁的极限承载能力。同时，通过模拟斜拉索的不同断裂位置，对斜拉桥的极限承载能力进行了计算分析，求得了相应的稳定安全系数。 (3)在不同拉索断裂情况下，通过分析桥梁极限状态时各单元应变云图、荷载-位移时程曲线等，得到了拉索断裂损伤对结构性能的影响规律，进而为为该类桥梁在使用过程中的健康检测和维护维修提供一定参考。
[Abstract]:With the rapid development of cable-stayed bridges, the safety and durability of cable-stayed bridges have been paid more and more attention. Based on a provincial cable-stayed bridge, a finite element model is established to deal with the cable fracture damage of cable-stayed bridges. The safety reserve capacity under the limit state is calculated and analyzed. The specific contents are as follows: In this paper, the main causes of cable damage are analyzed, and the effects of chemical and physical behaviors on cable losses are introduced. The effect of wind and rain vibration on cable damage is emphasized. 2) based on the reference literature, the numerical model is established by using the finite element analysis software through the study of the calculation theory of stability problem and the calculation method of ultimate bearing capacity. The stability problem of the spatial finite element model under different load conditions is analyzed and calculated, and the stability safety factor under the corresponding load condition is obtained, and the ultimate bearing capacity of the bridge is calculated. The ultimate bearing capacity of the cable-stayed bridge is calculated and analyzed by simulating the different fracture positions of the stayed cables, and the corresponding stability safety factor is obtained. 3) in the case of different cable fracture, by analyzing the strain cloud diagram and load-displacement time history curve of each element in the limit state of the bridge, the influence law of the cable fracture damage on the structure performance is obtained. It provides a reference for the health inspection and maintenance of this kind of bridge.
【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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