摘要
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 is the lifeline in earthquake relief. One of the topic objectives for aseismic design is to ensure the collapse resistant capacity of the structures subjected to a severe earthquake. A nonlinear finite elemental mode based on a long-span cable-stayed bridge is built. Firstly, the component importance of the bridge subjected to an earthquake is evaluated by using the method based on the generalized structural stiffness, in which the critical components are identified. Secondly, a progressive collapse process is simulated. Lastly, the seismic vulnerability is quantitatively evaluated based on the incremental dynamic analysis(IDA). It is shown that the collapse probability of this bridge under a severe earthquake is 0.22%, which means that this bridge has stronger ability to resist collapse during an earthquake.
出处
《工程力学》
EI
CSCD
北大核心
2014年第S1期86-90,98,共6页
Engineering Mechanics
基金
交通运输部交通运输建设重大科技专项项目(2011-318-223-170)
中央高校基本科研业务费专项项目(FRF-TP-12-018A)
关键词
斜拉桥
重要性评价
IDA分析
倒塌
地震易损性
cable-stayed bridge
importance evaluation
incremental dynamic analysis
collapse
seismic vulnerability
