System Reliability Evaluation of Ductile Frame Structures

~BS~RAC!: ThC? s~stem re~ability evaluation of ductile frame structures presents two difficulties. One is the 1dent1fication. of. s1gmficant fallure ~odes; the other is the computation of overall failure probabilities contributed from these s1gmficant modes. In this paper, a practical procedure is developed, in which a failure mode inde­ pendent ~rformance function is defined using load factor obtained by limit analysis, and a response surface approach 1S use~ to appro~imate the ~~ormance func~on. Wi~ the performance function of explicit second­ degree polynom1al, the fallure probab1lity can be readtly obtained using First and Second Order Reliability !'1ethod (FO~SO~M). Seve~al examples~ investigated, and it is found that the obtained response surface 1S a good apprOX1mation of the mn~r connotative surface of the limit state surfaces of the structural system. The proposed procedure has good effic1ency and enough accuracy for system reliability evaluation of ductile frame structures. The difficulty in both failure mode identification and failure probability computation can be avoided by using the proposed procedure.

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