How to Include Reliability Constraints in Structural Optimization

by Dan M. Frangopol, Univ of Colorado at Boulder, Boulder, United States,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation


Structural optimization is a complex process made of design cycles aimed at finding the best possible solution. At each design cycle ultimate and/or serviceability limit states must be checked according to code requirements. In the United States, these requirements are generally based on the Load and Resistance Factor Design (LRFD) methodology. This methodology uses load and resistance factors which have been developed from the modern theory of structural reliability. Therefore, structural optimization and structural reliability have to be coupled in order to achieve practical solutions. This paper describes how to include reliability constraints in structural optimization problems. A reliability-based framework for controlling structural safety during the optimization process is thus provided.

Subject Headings: Structural reliability | Load and resistance factor design | Structural safety | Computer aided design | Serviceability | Limit states | Standards and codes | Coupling | United States

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