Influence of time-varying attenuation effect of damage index on seismic fragility of bridge

IF 1.4 4区工程技术 Q3 ENGINEERING, CIVIL

Earthquakes and Structures Pub Date : 2020-10-01 DOI:10.12989/EAS.2020.19.4.287

J. Yan, Liang Yan, Zhao Boyang, W. Qian, Chen Huai

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引用次数: 3

Abstract

Fragility as one of the most effective methods to evaluate seismic performance, which is greatly affected by damage index. Taking a multi span continuous rigid frame offshore bridge as an example. Based on fragility and reliability theory, considering coupling effect of time-varying durability damage of materials and time-varying attenuation effect of damage index to analyze seismic performance of offshore bridges. Results show that IDA curve considering time-varying damage index is obviously below that without considering; area enclosed by IDA of 1# pier and X-axis under No.1 earthquake considering this effect is 96% of that without considering. Area enclosed by damage index of 1# pier and X-axis under serious damage with considering time-varying damage index is 90% of that without considering in service period. Time-varying damage index has a greater impact on short pier when ground motion intensity is small, while it has a great impact on high pier when the intensity is large. The area enclosed by fragility of bridge system and X-axis under complete destruction considering time-varying damage index is 165% of that without considering when reach designed service life. Therefore, time-varying attenuation effect of damage index has a great impact on seismic performance of bridge in service period.

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损伤指标时变衰减效应对桥梁地震易损性的影响

脆性作为评价抗震性能最有效的方法之一，其受损伤指标的影响很大。以一座多跨连续刚构桥为例。基于脆性和可靠性理论，考虑材料时变耐久性损伤的耦合效应和损伤指标的时变衰减效应，分析了海洋桥梁的抗震性能。结果表明，考虑时变损伤指数的IDA曲线明显低于不考虑时变损害指数的IDA曲线；1号地震作用下1#墩IDA与X轴的围合面积为未考虑围合面积的96%。考虑时变损伤指数的严重损伤情况下，1#墩和X轴的损伤指数围合面积为未考虑使用期损伤指数的90%。地震动强度小时，时变损伤指数对短墩的影响较大，强度大时，时变破坏指数对高墩的影响很大。考虑时变损伤指数的桥梁系统和X轴在完全破坏情况下的脆性包围面积为未考虑达到设计使用寿命时的165%。因此，损伤指标的时变衰减效应对桥梁服役期的抗震性能有很大影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

2.90

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response