en Optimal design Optimal design پژوهشي Research <span style="font-size:11.5pt"><span new="" roman="" style="font-family:" times="">Metaheuristic algorithms have become increasingly popular in recent years as a method for determining the optimal design of structures. Nowadays, approximate optimization methods are widely used. This study utilized the Self Adaptive Enhanced Vibrating Particle System (SA-EVPS) algorithm as an approximate optimization method, since the EVPS algorithm requires experimental parameters. As a well-known and large-scale structure, the 582-bar spatial truss structure was analyzed using the finite element method, and optimization processes were implemented using MATLAB. In order to obtain weight optimization, the self-adaptive enhanced vibration particle system (SA-EVPS) is compared with the EVPS algorithm.</span></span><br> &nbsp; Size optimization, Self-Adaptive algorithm, SA-EVPS algorithm, 582-bar spatial truss, discrete optimization problems. 207 217 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-66-371&slc_lang=en&sid=1 M. Paknahad 180031947532846002590 180031947532846002590 No Faculty of Engineering, Mahallat Institute of Higher Education, Mahallat, Iran P. Hosseini P.Hosseini@mahallat.ac.ir 180031947532846002591 180031947532846002591 Yes Faculty of Engineering, Mahallat Institute of Higher Education, Mahallat, Iran S.J.S. Hakim 180031947532846002592 180031947532846002592 No Department of Civil Engineering, Faculty of Civil Engineering and Built Environment, University Tun Hussein onn Malaysia (UTHM), Malaysia