119 abstract «research note» measuring the abilities of four approximation approaches for trusses optimization

there are a lot of approximation techniques for structural optimization. among them, four outstanding approximation methods have been selected for trusses optimization. these approaches have been developed or modified by previous ones. based on these schemes, a lot of trusses have been optimized by author's program. this study shows that the abilities of the mentioned methods are not the same and some of them have deficiencies. reaching a better solution, lesser analysis time, oscillation of response, numerical stability and also using a variety of the design variables are among the findings of this work. a brief of these obtained results has been given in the conclusion part.