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Uniform fragility spectra for the performance-based seismic design of structures considering variabilities in structural properties

机译：考虑结构特性变化的结构基于性能的抗震设计的均匀脆性谱

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This paper presents a new methodology based on structural performance to determine uniform fragility design spectra, i.e., spectra with the same probability of exceedance of a performance level for a given seismic intensity. The design spectra calculated with this methodology provide directly the lateral strength, in terms of yield- pseudo-accelerations, associated with the rate of exceedance of a specific ductility characterizing the performance level for which the structures will be designed. This procedure involves the assessment of the seismic hazard using a large enough number of seismic records of several magnitudes; these records are simulated with an improved empirical Green function method. The statistics of the performance of a single degree of freedom system are obtained using Monte Carlo simulation considering the seismic demand, the fundamental period, and the strength of the structure as uncertain variables. With these results, the conditional probability that a structure exceeds a specific performance level is obtained. The authors consider that the proposed procedure is a significant improvement to others considered in the literature and a useful research tool for the further development of uniform fragility spectra that can be used for the performance-based seismic design and retrofit of structures.
机译：本文提出了一种基于结构性能的新方法，可以确定均匀的脆性设计频谱，即对于给定的地震强度，具有超过性能水平的相同概率的频谱。用这种方法计算出的设计光谱可以直接提供横向强度（以屈服准加速度表示），该强度与特定延性的超出率相关，该延性表征了将要设计的结构的性能水平。该程序涉及使用足够数量的几个数量级的地震记录来评估地震危险。使用改进的经验格林函数方法对这些记录进行模拟。使用蒙特卡洛模拟，将地震需求，基本周期和结构强度作为不确定变量，使用单自由度系统的性能统计数据。利用这些结果，获得了结构超过特定性能水平的条件概率。作者认为，提出的程序是对文献中所考虑的其他程序的重大改进，并且是进一步开发可用于基于性能的抗震设计和结构翻新的均匀脆性谱的有用的研究工具。

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