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Seismic structural demands taking accuracy of response estimation into account

机译：地震结构需求考虑了响应估计的准确性

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摘要

Predictors of seismic structural demands (such as inter-storey drift angles) that are less time consuming than nonlinear dynamic analysis (NDA) have proven useful for structural performance assessment and for design. Several techniques have been proposed using the results of a nonlinear static pushover analysis. These techniques often use the maximum response computed via NDA of the inelastic oscillator that is 'equivalent' to the original frame. In practice, it is desirable to estimate the response approximately via a simpler method such as an equivalent linearization technique and uniform hazard spectra at the site. In reliability-based seismic performance assessment and design of a structure, it is necessary to consider the level of accuracy of the techniques used in the assessment. A simple technique is proposed in this paper to estimate the r-year return period value of the inter-storey drift angle of a moment-resisting steel frame using a single uniform hazard spectrum of the r-year return period displacement of an elastic oscillator. The structural demand is estimated using the safety factors evaluated taking the variability in the seismic hazard, accuracy of the techniques for estimating structural response, and the structural performance level into account. The accuracy of the technique is investigated relative to the structural demand estimated more directly from the probability distributions of the seismic hazard.
机译：事实证明，与非线性动力分析（NDA）相比，耗时少的地震结构需求（例如层间漂移角）预测器对结构性能评估和设计很有用。利用非线性静态推覆分析的结果，已经提出了几种技术。这些技术通常使用通过非弹性振荡器的NDA计算得出的与原始帧“等效”的最大响应。在实践中，理想的是近似地通过更简单的方法来估计响应，例如等效线性化技术和现场的均匀危险谱。在基于可靠性的抗震性能评估和结构设计中，有必要考虑评估所用技术的准确性。本文提出了一种简单的技术，利用弹性振子的r年返回周期位移的单一统一危险谱来估算抗弯钢框架的层间漂移角的r年返回周期值。结构需求是使用评估的安全系数估算的，这些安全系数考虑了地震危险的变化性，估算结构响应的技术的准确性以及结构性能水平。相对于根据地震危险的概率分布更直接估算的结构需求，研究了该技术的准确性。

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