考虑拉索抗力衰减及破断的斜拉桥可靠性分析

发布时间：2018-10-09 19:11

【摘要】：采用阶段临界强度分枝-约界法对一座斜拉桥模型进行了主要失效模式的搜索,分析了拉索抗力衰减及拉索破断情形下系统主要失效模式和系统可靠度的变化情况.结果表明:未出现断索情形时,结构系统主要失效模式间的相关性很高,但在有拉索破断后,主要失效模式间的相关性出现了明显分组特征;系统可靠度指标随着拉索抗力的衰减而逐渐降低,考虑拉索破断时,外索破断后剩余结构系统可靠度指标降低较多,得到了破断后对剩余结构系统可靠度影响最大的拉索位置,可为斜拉桥结构设计提供参考.
[Abstract]:The main failure modes of a cable-stayed bridge model are searched by using the method of critical strength branch-reduction bound, and the main failure modes and system reliability changes under the condition of cable resistance attenuation and cable breaking are analyzed. The results show that the correlation between the main failure modes of the structural system is very high when there is no cable break, but the correlation between the main failure modes appears obvious grouping characteristics after the cable break. The reliability index of the system decreases gradually with the attenuation of the cable resistance. When the cable is broken, the reliability index of the residual structure system after the breakage of the external cable decreases more, and the position of the cable which has the greatest influence on the reliability of the residual structure system after the breakage is obtained. It can provide reference for the structural design of cable-stayed bridge.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51578227)~~
【分类号】：U448.27

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