en Applications Applications پژوهشي Research In recent years many researchers prefer to use metaheuristic algorithms to reach the optimum design of structures. In this study, an Enhanced Vibrating Particle System (EVPS) is applied to get the minimum weight of large-scale dome trusses under frequency constraints. Vibration frequencies are important parameters, which can be used to control the responses of a structure that is subjected to dynamic excitation. The truss structures were analyzed by finite element method and optimization processes were implemented by the computer program coded in MATLAB. The effectiveness and efficiency of the Enhanced Vibrating Particle System (EVPS) is investigated in three large-scale dome trusses 600-, 1180-, and 1410-bar to obtain the weight optimization with frequency constraints. optimization, dome truss structures, frequency constraints, metaheuristic algorithms, Enhanced Vibrating Particle System. 105 123 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-66-333&slc_lang=en&sid=1 A. Kaveh 180031947532846002656 180031947532846002656 No School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran P. Hosseini p.hosseini@mahallat.ac.ir 180031947532846002657 180031947532846002657 Yes Faculty of Engineering, Mahallat Institute of Higher Education, Mahallat, Iran N. Hatami 180031947532846002658 180031947532846002658 No Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran S. R. Hoseini Vaez 180031947532846002659 180031947532846002659 No Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran