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A COMPARISON OF THE STRUTURAL RESPONSE TO SYNTHETIC EARTHQUAKE GROUND MOTIONS COMPATILE WITH CENTRAL EASTERN UNITED STATES ATTENUATION MODELS Troy W. Milburn September 25,2008 This study focuses on the variation in structural response to synthetic ground motions derived from the latest attenuation models developed for the Central Eastern United States (CEUS) and used by the USGS to develop the latest edition (2008) of the National Seismic Hazard Maps. Specifically, it compares the ductility demands induced by these synthetic earthquake records via nonlinear time history analysis conducted on single degree of freedom systems of various natural frequencies. The synthetic ground motions generated for the study are compatible with target response spectra from these eight CEUS attenuation models and representative of various magnitude and distance combinations. The goal was to investigate the amount of variation in the structural response due to ground motions described by these differing attenuation models. In particular, the study determines whether these discrepancies are too great to permit this approach for developing synthetic records to be used as input in time history analysis for the seismic design of structures in the CEUS. Results from the study do indeed show that the variation is great with many scenarios indicating conflicting predictions of ductility demand. In many cases there are contradictory results indicating whether damage would or would not occur (i.e., if the structure would reach yielding or not). Prime examples include the earthquake

A comparison of the structural response to synthetic earthquake ground motions compatible with central eastern United States attenuation models.