MINLP optimization of a single-storey industrial steel buildingŽula, Tomaž (Avtor) Kravanja, Zdravko (Avtor) Kravanja, Stojan (Avtor) civil engineeringtopology optimizationsizing optimizationnonlinear programmingMINLPThe paper presents the topology and standard sizes optimization of a single-storey industrial steel building, made from standard hot rolled I sections. The structure consists of main portal frames, connected with purlins. The structural optimization is performed by the Mixed-Integer Non-linear programming approach (MINLP). The MINLP performs a discrete topology and standard dimension optimization simultaneously with continuous parameters. Since the discrete/continuous optimization problem of the industrial building is non-convex and highly non-linear, the Modified Outer- Approximation/Equality-Relaxation (OA/ER) algorithm has been used for the optimization. Alongside the optimum structure mass, the optimum topology with the optimum number of portal frames and purlins as well as all standard cross-section sizes have been obtained. The paper includes the theoretical basis and a practical example with the results of the optimization.20082012-05-31 12:22:50Neznano26277sl