Development of Practical Method for Reliability-based Seismic Design and Assessment of Building Frames based on Maximum Drift

地震结构需求的预测指标，如层间位移角，比非线性动力分析(NDA)耗时更少，已被证明对结构性能评估和设计有用。已经提出了几种利用非线性静力Pushover分析结果的技术。这些技术通常使用通过非弹性振子的NDA计算的最大响应，该非弹性振子与原始框架“等效”。在实践中，最好是通过一种更简单的方法来近似估计响应，如等效线性化技术和现场统一的危险谱。在基于可靠度的结构抗震性能评估和设计中，必须考虑评估技术的精度水平。本文提出了一种利用弹性振子r年重复周期位移的单一统一危险谱来估算抗弯钢框架层间位移角r年重复周期的简单方法。在考虑地震危险性的可变性、结构响应估计技术的准确性和结构性能水平的情况下，使用所评估的安全系数来估计结构需求。根据地震危险性的概率分布更直接地估计出结构需求，研究了该技术的准确性。

Predictors of seismic structural demands such as inter-story 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-story 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.