Simplified Performance Based Design/Assessment: Towards an Improved SAC-FEMA Approach
Probabilistic seismic assessment offers a rational means of quantifying the risk posed by earthquakes. However, rigorous probabilistic seismic assessment and design methods are quite onerous and require a considerable level of expertise. In this context, efforts have been made to reduce barriers to implementation by developing simplified probabilistic seismic assessment methods. One approach, by Cornell et al (2002), permits simplified probabilistic seismic assessment by introducing fundamental assumptions regarding the relationship between displacement demand and seismic intensity measure, in addition to demand and capacity uncertainties. The simplified method aims to facilitate engineers with the ability to quantify the probability of collapse or some other limit state of interest. However, due to the assumptions inherent in the procedure, a number of criticisms of the accuracy of the approach have been made. In this study, the adequacy of the key assumptions being made in the method are examined further and subsequently, possible modifications to improve the accuracy of the approach are proposed.
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