A Method for Selecting Hazard-Consistent Ground Motions and Estimating Seismic Demand Hazard Curves

Abstract eng:
This paper presents a method to select unscaled ground motions for estimating seismic demand hazard curves (SDHCs) in performance-based earthquake engineering (PBEE). Currently, SDHCs are estimated from a probabilistic seismic demand analysis (PSDA), where several ensembles of ground motions are selected and scaled to a user-specified scalar conditioning intensity measure (IM). In contrast, the method presented herein provides a way to select a single ensemble of unscaled ground motions for estimating the SDHC. In the context of unscaled motions, the proposed method requires three inputs: (i) a database of unscaled ground motions, (ii) a small vector of IMs for selecting ground motions IM, and (iii) the number of ground motions to be selected, n; in the context of scaled motions, two additional inputs are needed: (i) a maximum acceptable scale factor, SF max , and (ii) a target fraction of scaled ground motions, γ . Using a recently developed approach for evaluating ground motion selection and modification procedures, the proposed method is evaluated and is demonstrated to provide accurate estimates of the SDHC when ground motions are unscaled.

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