论文部分内容阅读
桥梁结构是抗震救灾的生命线工程,保证强震作用下桥梁结构的抗倒塌能力是抗震设计的主要任务之一。该文以某大跨单塔斜拉桥为例,建立相应的有限元模型。首先,运用基于广义刚度的构件重要性评价方法分析了地震作用下该桥梁结构构件的重要性,并给出了关键构件;其次,模拟了桥梁地震作用下连续倒塌的过程;最后,运用基于IDA的倒塌易损性分析方法,对桥梁进行了定量的结构地震抗倒塌易损性评价,评价结果表明该桥梁在罕遇地震时对应的倒塌概率为0.22%,具有较强的抗地震倒塌能力。
Bridge structure is the life line project of earthquake relief. It is one of the main tasks of anti-seismic design to ensure the anti-collapse capability of bridge structure under strong earthquake. Taking a large span single tower cable-stayed bridge as an example, a corresponding finite element model is established. First of all, the importance of structural members under earthquake action is analyzed by means of importance assessment of members based on generalized stiffness, and the key components are given. Secondly, the process of continuous collapse under bridge seismic action is simulated. Finally, , The vulnerability of the bridge to earthquake collapse is evaluated quantitatively. The evaluation results show that the corresponding probability of collapse of the bridge is 0.22% in rare earthquakes, which has a strong capability of anti-seismic collapse.