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Methodology for the development of analytical fragility curves for retrofitted bridges

机译：改造桥梁分析易损性曲线的开发方法

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摘要

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.
机译：翻新桥梁的易损性曲线表明了各种翻新措施对达到指定损坏水平的可能性的影响。本文提出了一种分析方法，用于为各类桥梁系统开发脆弱性曲线。该方法捕获了改造对多个组件的脆弱性的影响（迄今为止尚未得到充分解决），并在应用不同改造措施前后对系统的脆弱性进行了比较。呈现的详细信息包括分析模型，不确定性处理，改造对需求模型的影响，容量估计以及组件和系统的脆弱性曲线。研究结果表明，评估改造的影响不仅对目标响应数量和组件易损性，而且对桥梁的整体脆弱性也很重要。如对一个多跨连续（MSC）混凝土大梁桥梁类别的案例研究所示，给定的改造措施可能对某些组件产生积极影响，而对其他关键组件则没有影响或消极影响。仅基于单个改装组件来考虑脆性，而不考虑系统，可能导致对桥梁脆性影响的高估或低估。所提出的方法提供了一个机会，可以有效地将MSC混凝土桥梁的脆弱性与一系列不同的改造措施进行比较。对于给定的强度，减少可能的损坏的最有效的改装方法是目标损坏状态的函数。

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