en Optimal design Optimal design پژوهشي Research The present paper tackles the optimization problem of double layer grids considering nonlinear behaviour. In this paper, an efficient optimization algorithm is proposed to achieve the optimization task based on the newly developed grey wolf algorithm (GWA) termed as sequential GWA (SGWA). In the framework of SGWA, a sequence of optimization processes is implemented in which the initial population of each process is selected from the neighboring region of the best design found in the previous optimization process. This procedure is repeated until a termination criterion is met. Two illustrative examples are presented and optimization is performed by GWA and SGWA and two other meta-heuristics. The numerical results indicate that the proposed SGWA utperforms the other algorithms in finding optimal design of nonlinear double layer grids. design optimization, nonlinear behaviour, double layer grid, meta-heuristic. 511 523 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-66-82&slc_lang=en&sid=1 S. Gholizadeh 18003194753284600881 18003194753284600881 Yes