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Accounting for spectral shape in simplified fragility analysis of case-study reinforced concrete frames

机译：在案例研究的钢筋混凝土框架的简化脆性分析中考虑光谱形状

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摘要

This paper deals with the selection of optimal intensity measures (IMs) for displacement-based seismic demand assessment and fragility derivation of case-study mid-rise reinforced concrete (RC) frames. The considered frames represent distinct RC vulnerability classes in the Mediterranean region. Optimal IM selection is performed by means of probabilistic seismic demand models considering multiple IMs and various engineering demand parameters (EDPs). Based on findings from previous and concurrent studies, a small subset of potential IMs is investigated here, including conventional peak IMs and two advanced scalar IMs accounting for spectral shape over a range of periods. Probabilistic seismic demand models are built on data obtained from analysis of the case-study frames subjected to over nine hundred ground motions by employing an innovative capacity spectrum method using inelastic response spectra derived from actual earthquake accelerograms to estimate seismic demand and derive fragility curves. This approach has the advantage of simplicity and rapidity over other methods as nonlinear dynamic analysis.This study concludes that advanced IMs, and particularly the ones accounting for period elongation (due to the nonlinear structural behavior) and structure-specific parameters, can effectively satisfy all the selection criteria, including the hazard computability criterion.
机译：本文针对基于位移的地震需求评估和案例研究中高层钢筋混凝土（RC）框架的脆性推导，选择最佳强度度量（IM）。所考虑的框架代表了地中海地区不同的RC脆弱性类别。通过考虑多个IM和各种工程需求参数（EDP）的概率地震需求模型来执行IM的最佳选择。根据之前和同时进行的研究发现，这里对一小部分潜在的IM进行了研究，包括常规的峰值IM和两个高级标量IM，这些IM解释了一段时间内的频谱形状。概率地震需求模型基于通过分析经受九百次地震动的案例研究框架而获得的数据，该模型采用了一种创新的容量谱方法，该方法使用了从实际地震加速度图得出的非弹性响应谱来估计地震需求并得出脆性曲线。该方法相对于非线性动力学分析方法而言具有比其他方法更简单，更快速的优势。本研究的结论是，先进的IM，尤其是考虑了周期伸长（由于非线性结构行为）和特定于结构的参数的IM，可以有效地满足所有要求。选择标准，包括危害可计算性标准。

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