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Ib Enevol dsen, Pr oj ect Di rect or. RAMBOLL. Vi rum. Denmar k 1 ) l 1 .Even though t he i ndi vi dual approach i s m ore expens i ve than t he general approach-t he di ff erence i s m argi nal com pared wi t h the possi bl e cost savi ngs. Report sPeer -revi ewed by i nt ernati onal expert s and dccept ed for publ icati on by IABSE Publ i cat i ons Commi tt ee Pape 1 ' rece i s' ed : . Ap ri l --' 5-2( ? ( ) 1

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Reliability-based design of structural systems is considered. Especially systems where the reliability model is a series system of parallel systems are analysed. A sensitivity analysis for this class of problems is presented. Direct and sequential optimization procedures to solve the optimization problems are described. Numerical tests indicate that a sequential technique called the bounds iteration method (BIM) is particularly fast and stable.

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