Abstract
In this paper, a continuous hybrid meta-heuristic method (ANGEL) is presented for the minimal weight optimization problem of steel bridges. A combined shaping-sizing optimization problem is considered where the cross-sectional areas and the positions of the nodal points are simultaneously optimized. ANGEL combines ant colony optimization (ACO), genetic algorithm (GA), and local search strategy (LS). ACO and GA search alternately and cooperatively in the solution space. The discrete solutions are computed by an optimal rounding algorithm according to the given catalogue values. A simple but efficient local search procedure is proposed as well, which is able to improve the quality of the discrete solutions. Experimental results are presented for shaping-sizing optimization of steel bridges.
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