Updating robust reliability using structural test data

The concept of robust reliability is de®ned to take into account uncertainties from structural modeling in addition to the uncertain excitation that a structure will experience during its lifetime. A Bayesian probabilistic methodology for system identi®cation is integrated with probabilistic structural analysis tools for the purpose of updating the assessment of the robust reliability based on dynamic test data. Methods for updating the structural reliability for both identi®able and unidenti®able models are presented. Application of the methodology to a simple beam model of a single-span bridge with soil-structure interaction at the abutments, including a case with a tuned-mass damper attached to the deck, shows that the robust reliabilities computed before and after updating with ameasuredo dynamic data can differ signi®cantly. q 2001 Elsevier Science Ltd. All rights reserved.

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