考虑构件地震相关性的近海桥梁二维地震易损性分析  

The Two-dimensional Seismic Fragility Analysis of the Offshore Bridge in Considering the Seismic Correlation between Different Components

作　　者：任文静 邱大鹏 张智 柳春光 Ren Wenjing;Qiu Dapeng;Zhang Zhi;Liu Chunguang(Equipment Infrastructure Division,Jinan Vocational College,Jinan 250110,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Faculty Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]济南职业学院,设备基建处,济南250110 [2]山东建筑大学,土木工程学院,济南250101 [3]大连理工大学,建设工程学部,大连116024

出　　处：《震灾防御技术》2024年第1期96-107,共12页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金(52208397);山东省高等学校青创科技支持计划(2023KJ123);山东省自然科学基金(ZR2020QE280、ZR2021QE126)。

摘　　要：为了更加全面合理地评价我国近海桥梁结构的抗震性能,本研究开展了考虑氯离子侵蚀的简支梁桥二维地震易损性研究。以我国近海潮汐环境中某简支梁桥为例,基于IDA方法考虑了氯离子侵蚀对结构的不利影响,并模拟了桥梁的地震响应过程;选取合适的板式橡胶支座和桥墩损伤指标并得到了各自的地震易损性曲线,揭示了两构件之间地震的内在相关性,进一步基于相关性分析方法明确了两构件的相关系数,得到了桥梁结构合理的二维地震易损性曲线。结果表明,板式橡胶支座和桥墩之间的地震需求与抗震能力均存在密切的相关性,基于不同构件地震相关性的二维易损性曲线可以更加全面地评价桥梁结构的抗震性能。研究成果可以为近海桥梁抗震设计和地震风险评估提供科学依据与技术支持。In order to evaluate the seismic performance of the offshore bridge in China,the two-dimensional seismic fragility analysis of the offshore simply supported beam bridge in considering the chloride ion erosion is conducted in this paper.Taking a concrete bridge in the offshore tidal environment as an example,the adverse effects the chloride ion erosion on structure are investigated.The seismic response of bridge structure is simulated based on the IDA method.The appropriate damage indexes of plate rubber bearing and pier are selected,and seismic fragility curves are obtained.The internal correlation mechanism of seismic responses between two components is revealed,and the correlation coefficients between different components are proposed based on the correlation analysis method.Finally,the reasonable two-dimensional seismic fragility curves of the bridge structure are achieved.The results show that the correlations of the seismic demand and seismic capacity between plate rubber bearings and piers are significant,and the two-dimensional seismic fragility curves based on the correlation of different components can more comprehensively evaluate the seismic performance of the bridge structure.Our results are helpful in providing scientific basis and technical support for seismic design and seismic risk assessment of offshore bridges.

关 键 词：近海桥梁 氯离子侵蚀 IDA方法 构件地震相关性 二维地震易损性分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]