Investigation of the Applicability of the FEMA P695 Approach for the Consideration of the Spectral Shape Effect in Canada

A key component of the nonlinear time-history analysis of structures is the selection and scaling of ground motion records. The uniform hazard spectrum (UHS) is the most commonly used target response spectrum for record selection. However, due to the inherent conservatism of UHS, its appropriateness as a target spectrum has been raised in the research literature. A parameter epsilon (ɛ), which is an indicator of spectral shape, may be used to account for this conservatism of the UHS. In the US, FEMA P695 has introduced a spectral shape factor to account for the effect of epsilon in dynamic analysis of structures.

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