Genetic algorithm based optimization of regular steel building structures subjected to seismic effects

In either elastic or dissipative seismic design of structures, key issue is the optimal design of the lateral load resisting system. Beside the basic effort to provide economical structure, proper overall behaviour with global ductility cannot be achieved without optimized design of the seismic resistant system. In this paper, development of a numerical optimization algorithm is presented and – using the developed algorithm – results of structural optimization for various building cases are illustrated. Numerical algorithm is developed in Matlab, incorporating the simplified structural analysis (linear static and modal response spectrum analysis), the resistance and additional checking of the structure and optimization routine. In the study, bracing systems with different level of energy dissipation are used. Aim is find the optimal structural configuration resulting in minimum construction weight, with given building geometry, loading and seismic effects.