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Seismic fragility estimates for corroded reinforced concrete bridge structures with two-column bents

机译:具有两列弯头的锈蚀钢筋混凝土桥梁结构的地震易损性估算

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摘要

To assess the losses associated with future earthquakes, seismic vulnerabilityfunctions are commonly used to correlate the damage or loss of a structure to the level ofseismic intensity. A common procedure in seismic vulnerability assessment is toestimate the seismic fragility, which is defined as the conditional probability that astructure fails to meet the specific performance level for given level of seismic intensity.This dissertation proposes a methodology to estimate the fragility of corrodedreinforced concrete (RC) bridges with two-column bents subject to seismic excitation.Seismic fragility functions are first developed for the RC bridges with two-column bents.All available information from science/engineering laws, numerical analysis, laboratoryexperiments, and field measurements has been used to construct the proper form of thefragility functions. The fragility functions are formulated, at the individual column,bent, and bridge levels, in terms of the spectral acceleration and the ratio between thepeak ground velocity and the peak ground acceleration. The developed fragilityfunctions properly account for the prevailing uncertainties in fragility estimation. The probabilistic capacity and demand models are then combined with the probabilisticmodels for chloride-induced corrosion and the time-dependent corrosion rate. Thefragility estimates for corroded RC bridges incorporates the uncertainties in theparameters of capacity and demand models, and the inexactness (or model error) inmodeling the material deterioration, structural capacity, and seismic demands. Theproposed methodology is illustrated by developing the fragility functions for an exampleRC bridge with 11 two-column bents representing current construction in California.The developed fragility functions provide valuable information to allocate andspend available funds for the design, maintenance, and retrofitting of structures andnetworks. This study regarding the vulnerability of corroding RC bridges will be ofdirect value to those making decisions about the condition assessment, residual life, andthe ability of lifeline structures to withstand future seismic demands.
机译:为了评估与未来地震相关的损失,通常使用地震易损性函数将结构的损坏或损失与地震烈度水平相关联。地震易损性评估的一个常见程序是评估地震易损性,这是在给定的地震烈度水平下,结构未能达到特定性能水平的条件概率。本文提出了一种评估腐蚀钢筋混凝土(RC)易损性的方法。 )受到地震激励的具有两列弯头的桥梁。首先为具有两列弯头的RC桥梁开发了地震脆性函数,并使用了来自科学/工程定律,数值分析,实验室实验和现场测量的所有可用信息来构造适当形式的脆弱性功能。易碎性函数是根据频谱加速度以及峰值地面速度与峰值地面加速度之间的比率在各个列,弯曲和桥水平上制定的。所开发的脆弱性功能适当地考虑了脆弱性估计中的普遍不确定性。然后将概率容量和需求模型与氯化物引起的腐蚀的概率模型和随时间变化的腐蚀速率相结合。锈蚀钢筋混凝土桥梁的易损性评估考虑了容量和需求模型参数的不确定性,以及对材料劣化,结构能力和地震需求建模的不精确性(或模型误差)。通过为示例钢筋混凝土桥梁开发易碎性功能来说明拟议的方法,该钢筋混凝土桥梁具有11个两列弯头,代表加利福尼亚州的当前建筑。已开发的易碎性功能提供了宝贵的信息,可用于分配和花费可用资金来进行结构和网络的设计,维护和翻新。这项对钢筋混凝土桥梁腐蚀的脆弱性的研究将对那些做出有关状态评估,剩余寿命以及生命线结构承受未来地震需求的能力的决策者具有直接价值。

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    Zhong Jinquan;

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  • 年度 2009
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