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由于列车的行驶,组合(钢)高铁桥受不同程度的动力作用。这可导致桥梁断裂集中,甚至在结构内部延伸。根据程度和强度的不同,动力作用危害结构性能和可靠度,减少桥梁的工作年限。研究某宽为12.5m,混凝土层厚度为0.23m,跨度为40.0m(每跨13.5m)的钢-混凝土组合高铁桥,在ANSYS中建立其动力分析有限元模型,采用精细化方法划分网格。评价规范中的分析方法,根据结构工作年限评估桥梁断裂性能。基于桥梁工作年限的修订和钢结构断裂理论,通过S-N曲线评价应力盘点技术及累积损伤规则。采用组合结构规范中推荐的方法进行分析。研究表明:在列车动载作用时,桥梁可能发生的与工作年限相关的扭曲行为应引起重视。
Due to the train driving, the combination (steel) high-speed rail bridge is subject to varying degrees of dynamic effects. This can result in a concentrated bridge break, even within the structure. Depending on the degree and strength, the dynamic effect jeopardizes the structural performance and reliability and reduces the working life of the bridge. A steel-concrete composite high-speed railway bridge with a width of 12.5m, a concrete layer thickness of 0.23m and a span of 40.0m (spanning 13.5m) was established. The finite element model of dynamic analysis was established in ANSYS. . Evaluation methods in the analysis of the specification, according to the structure of working life assessment of bridge fracture performance. Based on the revision of bridge working life and the theory of steel structure fracture, stress inventory technique and cumulative damage rule are evaluated by S-N curve. Adopt the method recommended in the composite structure specification for analysis. The research shows that the distortions related to working years that bridge may take place should pay attention to when the train is moving.