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 si~nultaneously calculated inside the continuous space. As the discrete/continuous optimization problem of the composite beams is nonconvex and highly non-linear, the Modified Outer-Approximation/EqualiQRelaxation (OAIER) algorithm has been used for the optimization. The aence accompanied Linked Two-Phased MINLP Strategy accelerated the conver, of the mentioned algorithm.
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