Robust Reliability-based Design Optimization of Suspension Bridges

Abstract

Design rules for modem cable suspension bridges are developed using reliability theories inside a general risk management based framework. In this context, optimal structural design must be considered under the presence of uncertainties in loading, geometry and material properties, whereas the deterministic approaches of optimization neglect the effects of uncertainties associated with design variables. This paper is based on the theory of finite element reliability analysis of geometrically nonlinear elastic structures. It provides computer implementation considerations and developments. For the assessment of overall reliability of suspension bridges, in this paper only static load effects are examined. The sensitivity of the reliability judgments with respect to different loading combinations is also studied.