Methodology for the development of analytical fragility curves for retrofitted bridges
Methodology for the development of analytical fragility curves for retrofitted bridges
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DOI：
10.1002/eqe.801
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发表时间：
2008-07-10
影响因子：
4.5
通讯作者：
DesRoches, Reginald
中科院分区：
文献类型：
--
作者：
Padgett, Jamie E.;DesRoches, Reginald
加固桥梁的易损性曲线表明了各种加固措施对达到特定损伤水平的概率的影响。本文提出了一种分析方法，制定脆弱性曲线的类别改造桥梁系统。该方法捕捉到的影响，改造的脆弱性的多个组成部分，迄今为止还没有得到充分解决，并导致在系统的脆弱性比较之前和之后的应用不同的改造措施。详细介绍了分析建模，不确定性处理，改造需求模型，容量估计，组件和系统的脆弱性曲线的影响。研究结果表明，评估的重要性，改造的影响，不仅对目标的响应量和组件的脆弱性，但也对整体桥梁的脆弱性。如改造的多跨连续（MSC）混凝土梁桥类的案例研究所示，给定的改造措施可能会对某些组件产生积极影响，但对其他关键组件没有影响或产生负面影响。仅根据单个改造部件考虑脆弱性，而不考虑系统，可能导致高估或低估对桥梁脆弱性的影响。所提出的方法提供了一个机会，有效地比较的MSC混凝土桥梁改造的脆弱性与一系列不同的改造措施。对于给定的强度，在减少可能的损坏方面最有效的改造是感兴趣的损坏状态的函数。版权所有（c）2008约翰威利父子有限公司。
Fragility curves for retrofitted bridges indicate the influence of various retrofit measures on the probability of achieving specified levels of damage. This paper presents an analytical methodology for developing fragility curves for classes of retrofitted bridge systems. The approach captures the impact of retrofit on the vulnerability of multiple components, which to date has not been adequately addressed, and results in a comparison of the system fragility before and after the application of different retrofit measures. Details presented include analytical modeling, uncertainty treatment, impact of retrofit on demand models, capacity estimates, and component and system fragility curves. The findings indicate the importance of evaluating the impact of retrofit not only on the targeted response quantity and component vulnerability but also on the overall bridge fragility. As illustrated by the case study of a retrofitted multi-span continuous (MSC) concrete girder bridge class, a given retrofit measure may have a positive impact on some components, yet no impact or a negative impact on other critical components. Consideration of the fragility based only on individual retrofitted components, without regard for the system, may lead to over-estimation or under-estimation of the impact on the bridge fragility. The proposed methodology provides an opportunity to effectively compare the fragility of the MSC concrete bridge retrofit with a range of different retrofit measures. The most effective retrofit in reducing probable damage for a given intensity is a function of the damage state of interest. Copyright (c) 2008 John Wiley & Sons, Ltd.