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首页> 外文期刊>Journal of Earthquake Engineering >An Efficient Approach for Seismic Fragility Assessment with Application to Old Reinforced Concrete Bridges
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An Efficient Approach for Seismic Fragility Assessment with Application to Old Reinforced Concrete Bridges

机译：一种用于旧钢筋混凝土桥梁的地震易损性评估的有效方法

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摘要

A procedure for seismic fragility assessment, suitable for application to non ductile RC structures is presented, which is based on the estimate of a response surface that gives the probability of failure of the structure as a function of the random variables that affect the response. The seismic fragility or risk is then evaluated through numerical integration. The method considers different sources of uncertainty: (ⅰ) in the seismic input, through the use of different accelerograms for the dynamic analysis; (ⅱ) in the structural response, through the use of a refined nonlinear finite element model; and (ⅲ) in the ultimate state capacity, taking into account the different modes of failure which may occur, for which a random mechanical capacity model is available. Aiming at reducing the number of simulation analyses, the uncertainties on the seismic input and on the mechanical parameters governing the response are treated according to the response surface methodology, while the limit-state randomness is treated explicitly during the simulations.rnUsing the proposed procedure, the seismic safety of two reinforced concrete bridges from Italian highway network, with simply supported deck and either single stem or frame piers, is evaluated. The results are expressed in terms of fragility curves as function of spectral acceleration. The obtained results highlight the influence of material randomness on reliability and the relative importance of seismic input with respect to mechanical and epistemic uncertainly.
机译：提出了一种适用于非延性RC结构的地震脆性评估程序，该程序基于响应面的估计值，该值给出了结构失效的概率与影响响应的随机变量的关系。然后通过数值积分评估地震的脆弱性或风险。该方法考虑了不同的不确定性来源：（ⅰ）在地震输入中，通过使用不同的加速度图进行动态分析； （ⅱ）在结构响应中，通过使用改进的非线性有限元模型； （ⅲ）在最终状态容量中，考虑到可能发生的不同失效模式，为此可以使用随机的机械容量模型。为了减少仿真分析的数量，根据响应面方法处理了地震输入和控制响应的机械参数的不确定性，同时在仿真过程中明确处理了极限状态随机性。评估了意大利公路网的两座钢筋混凝土桥梁的抗震安全性，这些桥梁具有简单的支撑甲板和单杆或框架墩。结果以脆性曲线表示为光谱加速度的函数。所获得的结果突显了材料随机性对可靠性的影响以及地震输入相对于机械和认识论的不确定性的相对重要性。

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