| 材料性能劣化对刚构桥地震易损性的影响分析? |
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| 引用本文： | 傅沛瑶,徐略勤,龚 恋,李建中.材料性能劣化对刚构桥地震易损性的影响分析?[J].防灾减灾工程学报,2020(5):779-788. |
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| 作者姓名： | 傅沛瑶 徐略勤 龚 恋 李建中 |
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| 作者单位： | 重庆交通大学土木工程学院,重庆 400074;同济大学土木工程防灾国家重点实验室,上海 200092 |
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| 基金项目： | 重庆市基础与前沿研究计划项目(cstc2015jcyjA30014)、国家自然科学基金资助(51408089)、重庆交通大学研究生教育创新基金项目(2018S0121)、国家重点研发计划重点专项子课题(2016YFC0802206-3)资助 |
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| 摘 要： | 为了揭示山区服役环境下材料性能劣化对桥梁抗震安全性的影响,根据混凝土碳化和钢筋锈蚀规律得到山区环境下材料劣化时变模型,采用基于需求能力比(D/C)的动力增量分析(IDA)方法,提出了桥梁时变地震易损性分析流程。围绕某山区典型高墩刚构桥,研究了桥梁构件和体系两个层次的地震易损性时变规律。结果表明:构件塑性发展程度越高,材料劣化的影响越不利,构件曲率延性系数也越大;相比于横桥向,材料劣化对构件纵向地震易损性的影响更大,且服役时间越长,构件地震损伤概率越高;桥梁体系的损伤概率上限高于任意构件,材料劣化的不利影响也主要体现于纵桥向,该方向上 0.8g 时,服役 100 年的严重受损概率相比新桥增大 100.86%;材料劣化对桥梁地震易损性的影响不容忽视,且构件层面的易损性评估不足以反映桥梁体系的易损性。
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| 关 键 词： | 桥梁工程 时变易损性 高墩刚构桥 材料劣化 关键构件 桥梁体系 |
Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges |
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| FU Peiyao,XU Lveqin,GONG Lian,LI Jianzhong.Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges[J].Journal of Disaster Prevent and Mitigation Eng,2020(5):779-788. |
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| Authors: | FU Peiyao XU Lveqin GONG Lian LI Jianzhong |
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| Affiliation: | School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074 ,China; State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092 ,China |
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| Abstract: | In order to reveal the effect of material performance degradation on the seismic safety ofbridges in mountainous service environments,time-dependent models of material deterioration inmountainous areas were obtained according to the laws of concrete carbonization and reinforcementcorrosion,and a time-dependent seismic vulnerability analysis process for bridges was proposed byadopting the incremental dynamic analysis(IDA)based on the demand to capacity ratio(D/C ratio).Based on a typical rigid frame bridge with high piers in a certain mountainous area,the time-dependentlaws of seismic vulnerability corresponding to the bridge components and the system were studied.The results show that with higher degree of plasticity development the bridge components,the influ?ence of material deterioration is more significant,and greater curvature ductility coefficients can be an?ticipated within the components. The material deterioration has a greater impact on the seismic vulner?ability of the components along the longitudinal direction compared to that along the transverse direc?tion. With a longer service life,the components suffer a higher level of damage probability. The upperlimit of damage probability of the bridge system is higher than that of any components,and the ad?verse effect of material deterioration is also mainly reflected in the longitudinal direction. The exten?sive damage probability for a bridge in service for 100 years is increased by 100.86% at 0.8g due to ma?terial deterioration along the longitudinal direction in comparison with a newly-built bridge. The effectof material deterioration on the seismic vulnerability of bridges cannot be ignored,and the vulnerabili?ty assessment at the component level is not sufficient to reflect the vulnerability of the bridge system. |
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