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Seismic fragility analysis: Application to simple linear and nonlinear systems

机译：地震脆性分析：在简单的线性和非线性系统中的应用

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摘要

Seismic fragility of a structural, nonstructural and/or geotechnical system is the probability that a system response exceeds a critical value under seismic ground motions of specified intensities. Fragility curves are plots of system fragilities versus a scalar measure of seismic intensity. Traditionally, peak ground acceleration (PGA) has been used as an intensity measure. Recent studies show that pseudo-spectral acceleration provides a superior measure of seismic intensity than PGA.rnIt is shown that pseudo-spectral acceleration may not be a satisfactory measure of seismic intensity for the fragility analysis of nonlinear systems, so that fragility curves based on pseudo-spectral acceleration are not recommended for these systems. An alternative intensity measure based on two parameters, the earthquake moment magnitude m and the distance r from the seismic source to system site, is proposed for the fragility analysis of nonlinear systems. The relationship between a system probability of failure and (m,r) is called fragility surface. Findings are for single degree of freedom systems and synthetic ground motion records.
机译：结构，非结构和/或岩土系统的地震易损性是系统响应在指定强度的地震地面运动下超过临界值的概率。易碎性曲线是系统易碎性与地震强度的标量度量之间的关系图。传统上，峰值地面加速度（PGA）已用作强度度量。最近的研究表明伪谱加速度比PGA提供了更好的地震烈度度量.rn表明伪谱加速度对于非线性系统的脆性分析可能不是令人满意的地震烈度度量，因此基于伪谱的脆性曲线对于这些系统，不建议使用-光谱加速度。针对非线性系统的易损性分析，提出了一种基于地震力矩大小m和震源到系统地点的距离r这两个参数的强度估计方法。系统失效概率与（m，r）之间的关系称为脆性面。发现适用于单自由度系统和合成地面运动记录。

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