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，如层间漂移角，比非线性动力分析（NDA）更节省时间，已被证明对结构性能评估和设计有用。利用非线性静态推覆分析的结果，提出了几种技术。这些技术通常使用通过NDA计算的非弹性振荡器的最大响应，该响应与原始框架“等效”。在实践中，人们希望通过一种更简单的方法，如等效线性化技术和现场的均匀危险谱，来近似地估计响应。在基于可靠度的结构抗震性能评估和设计中，有必要考虑评估中使用的技术的准确性。本文提出了一种利用弹性振子位移的单一均匀危险谱估计抗弯矩钢框架层间漂移角的年重现值的简单方法。结构需求是使用安全系数来评估的，考虑了地震危险的可变性，估计结构反应的技术的准确性，以及考虑到结构性能水平。研究了该技术相对于更直接地由地震危险性概率分布估计的结构需求的准确性。

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.