Reliability Constraint on Optimum Designby Deh-Shiu Hsu, Natl Cheng Kung Univ, Tainan, Taiwan,
Abstract: The purpose of the paper is to emphasize the importance of the probability concern on optimum design work. The probability of failure of the structure can be considered as one of the optimum design constraints in addition to stress constraint, strain constraint, buckling constraint . . . etc. Examples of plane truss, space frame and a simple portal frame are presented. In truss analysis, the weakest link model is assumed to be available for both statically determinate and statically indeterminate problems. Probability of failure for individual elements and for the whole truss are calculated. In the simple portal frame problem, the risk value according to seismic loads at certain selected sites and to damage stages classified by yielding condition and mechanism types are calculated for various designs. The best designed structure might be considered as the structure with the lowest probability of failure and with equally ordered probability of failure for different components.
Subject Headings: Probability | Failure analysis | Structural failures | Trusses | Space frames | Structural safety | Structural reliability
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