Seismic fragility of a typical bridge using extrapolated experimental damage limit states
Seismic fragility of a typical bridge using extrapolated experimental damage limit states
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使用外推实验损伤极限状态计算典型桥梁的地震脆弱性
DOI：
10.12989/eas.2017.13.6.599
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发表时间：
2017
影响因子：
1.5
通讯作者：
Lu Da-Gang
中科院分区：
文献类型：
--
作者：
Liu Yang;Fabrizio Paolacci;Lu Da-Gang
针对一座典型钢-混凝土组合桥梁，采用混凝土桥面板与桥墩连接节点构造，改善其地震易损性。基于SEQBRI项目中的一座典型钢-混凝土组合桥梁模型的拟静力试验，对关键构件CCB和桥墩的损伤状态进行了识别。建立了有限元模型，并利用试验数据对模型进行了标定，以模拟从试件试验中观察到的CCB和桥墩的损伤状态。然后，得到了CCB的元件脆性曲线，
和桥墩的系统易损性曲线进行了推导和组合，得到了桥梁的系统易损性曲线。与平均系统脆弱性的不确定性进行了讨论和量化。研究表明，在一定的损伤状态下，CCB比桥墩更容易受到破坏，典型的CCB钢-混凝土组合桥梁具有良好的抗震性能。
This paper improves seismic fragility of a typical steel-concrete composite bridge with the deck-to-pier connection joint configuration at the concrete crossbeam (CCB). Based on the quasi-static test on a typical steel-concrete composite bridge model under the SEQBRI project, the damage states for both of the critical components, the CCB and the pier, are identified. The finite element model is developed, and calibrated using the experimental data to model the damage states of the CCB and the bridge pier as observed from the experiment of the test specimen. Then the component fragility curves for both of the CCB
and the pier are derived and combined to develop the system fragility curves of the bridge. The uncertainty associated with the mean system fragility has been discussed and quantified. The study reveals that the CCB is more vulnerable than the pier for certain damage states and the typical steel-concrete composite bridge with CCB exhibits desirable seismic performance.