Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges

Peiyao FU; Lveqin XU; Lian GONG; Jianzhong LI

doi:10.13409/j.cnki.jdpme.2020.05.013

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Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges

更新时间：2025-09-25

- Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges
- Journal of Disaster Prevention and Mitigation Engineering Vol. 40, Issue 5, Pages: 779-788(2020)
- 作者机构：
  
  1.重庆交通大学土木工程学院，重庆 400074
  2.同济大学土木工程防灾国家重点实验室，上海 200092
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.2020.05.013
  CLC： U442.5⁺5
- Received：31 July 2018，
  
  Revised：2018-09-06，
  
  Published：15 October 2020
- 稿件说明：
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傅沛瑶,徐略勤,龚恋等.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,2020,40(05):779-788.

FU Peiyao,XU Lveqin,GONG Lian,et al.Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(05):779-788.
傅沛瑶,徐略勤,龚恋等.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,2020,40(05):779-788. DOI： 10.13409/j.cnki.jdpme.2020.05.013.

FU Peiyao,XU Lveqin,GONG Lian,et al.Effect of Material Deterioration on the Seismic Fragility of Rigid Frame Bridges[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(05):779-788. DOI： 10.13409/j.cnki.jdpme.2020.05.013.

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（

）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。

Abstract

In order to reveal the effect of material performance degradation on the seismic safety of bridges in mountainous service environments， time-dependent models of material deterioration in mountainous areas were obtained according to the laws of concrete carbonization and reinforcement corrosion， and a time-dependent seismic vulnerability analysis process for bridges was proposed by adopting 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-dependent laws 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 influence of material deterioration is more significant， and greater curvature ductility coefficients can be anticipated within the components. The material deterioration has a greater impact on the seismic vulnerability of the components along the longitudinal direction compared to that along the transverse direction. With a longer service life， the components suffer a higher level of damage probability. The upper limit of damage probability of the bridge system is higher than that of any components， and the adverse effect of material deterioration is also mainly reflected in the longitudinal direction. The extensive damage probability for a bridge in service for 100 years is increased by 100.86% at 0.8g due to material deterioration along the longitudinal direction in comparison with a newly-built bridge. The effect of material deterioration on the seismic vulnerability of bridges cannot be ignored， and the vulnerability assessment at the component level is not sufficient to reflect the vulnerability of the bridge system.

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references

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