Abstract
A procedure is presented for estimating an “annual limit-state frequency”, that is, the mean annual frequency of exceeding a (e.g. seismic-drift) limit state, for a partially-inspected earthquake-damaged SMRF building with fractured beam-column connections. Typically, inspection of all the moment-resisting connections in a building for fractures is prohibitively expensive. Motivated by this reality, the proposed procedure (developed as part of the SAC Steel Project) accounts for the uncertainty, due to incomplete inspection, in the total number and locations of fractured connections. Since the procedure can also take into account the aftershock ground motion hazard, an annual limit-state frequency estimated for a damaged building can serve as a basis for deciding, for example, whether to permit occupancy soon after the main-shock. Conversely, the estimated annual limit-state frequency can be used to guide inspection decisions, such as whether to inspect more connections and thereby reduce the uncertainty in the state of damage.
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