Abstract
The reliability of a structure in service is analysed as a function of successful past performance, including the effects of proof testing on correlated failure modes, and resistance of past service loads. For many failure modes not involving wearout, successful past service of a structure can be likened to a proof load test with uncertainty, and results in smaller probabilities of low strength and increased reliability estimates for older structures. After-service strength is found to be relatively insensitive to assumptions on the distribution of initial strength, and service-proven structural systems are found to have decreased likelihood of gross errors. Compared to single components, these beneficial effects of survival age are found to be more pronounced in non-redundant systems and less pronounced in redundant systems. Examples include chain and parallel ductile structural sytems.
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