In fact, the earthquake (near one minute with frequencies close to 1 Hz) and the eventual replicas. In the earthquakes, the SMA requirements are associated to the relatively reduced number of oscillations. This paper is centered in the required SMA behavior for their application to earthquakes damping in steel structures as in family houses and, also, in damping of stayed cables in bridges. It is concluded that this method can serve as a useful tool in engineering design and optimization. The implemented method is tested on 10 members of 2D steel structure, 25 members of 3D steel structures and 72 members of 3D steel structure, where the results are compared with previous researches. The purpose of this paper is to discuss combining SAP2000 structure analysis program with genetic algorithm for optimizing steel truss structure. 'Home-written' structure analysis program can be designed to achieve this task, but it may suffer from serious drawbacks such as bugs, lack of user friendliness, lack of generality, and unproven reliability. However, commercially available finite element programs are not designed for optimization tools. The use of nonlinear finite element can assist greatly in achieving a safe design. Genetic algorithms (GA) have been shown to be effective optimization tools for practical optimization problems. An approach is presented for the optimization of steel truss by combining evolutionary algorithms and commercial structure analysis program.
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