e537c30a_Funded_Project_Archive__Title
[Project #] 1312005 [PI Name] Allin Cornell [Institution] Stanford [Title] 
IM and Ground Motion Selection for EDP Hazard Assessment This project is developing recommended IMs for various site/building cases and recommended procedures for selection and processing of ground motion accelerograms for EDP hazard assessment. The recommendations will follow from development, consideration, study, and demonstration of alternatives, including the identification of their weaknesses and strengths. Included are both scalar and vector schemes for IMs. For example, for first-mode dominated buildings the preferred scalar may well be inelastic spectral displacement, as used in the Van Nuys test bed, whereas an alternative for important and/or taller structures may be a vector consisting of elastic Sa coupled with spectral ratios and/or epsilon. (Epsilon is the standardized deviation of Sa from its predicted (median) value.) Far and near-source situations are being considered; the latter require extra care and/or modified IMs. The recommended procedures include (1) record selection and record processing such as scaling and/or shaping, (2) number and kinds of Nonlinear Time History (NTH) analyses, and (3) suggested post-processing of response output. Fundamental engineering insights can be derived by recognition of the highly inter-related issues of record selection, scaling and processing - as it relates to a specific site and structure. Structures are, in general, three-dimensional and with different natural periods in different directions. The project will address this problem as well.
Funded Project Archive
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