Author(s)

S. Kravanja & S. Silih

Abstract

The MINLP optimisation of composite I-beams S. Kravanja and S. Silih University ofMaribor, Faculty of Civil Engineering Smetanova 17, 2000 Maribor, Slovenia Abstract The paper presents the optimization of composite I-beams, designed to be connected together from structural steel I sections and reinforced concrete slabs. The optimization of composite beams has been performed by the Mixed-Integer Non-linear Programming (MINLP) approach. The MINLP performs a discrete optimization of different materials and standard dimensions, while continuous parameters are simultaneously calculated inside the continuous space. As the discrete/continuous optimization problem of the composite beams is non- convex and highly non-linear, the Modified Outer-Approximation/Equality- Relaxation (OA/ER) algorithm has been used for the optimization. The accompanied Linked Two-Phased MINLP Strategy accelerated the convergence of the mentioned algorithm. 1 Introduction The paper presents the opti

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