“…In the literature, there are many available successful applications of metaheuristic algorithms on structural optimization problems such as pin joint structures (Dogan, Hasancebi, and Saka 2009;Hasançebi et al 2009;Hasancebi and Azad 2015), steel rigid frames (Hasançebi, Erdal, and Saka 2010;Hasançebi et al 2011;Azad, Hasancebi, and Azad 2013;Saka and Geem 2013;Azad and Hasancebi 2015), skeletal structures (Saka 2014), semi-rigid frames (Artar and Daloglu 2015b), composite steel frames (Artar and Daloglu 2015a), RC frames (Akin and Saka 2015) and retaining walls (Akin and Saka 2010; Camp and Akin 2012). Furthermore, review studies are found in the literature on the applications of metaheuristic algorithms Saka and Geem 2013;Sahab, Toropov, and Gandomi 2013;Zavala et al 2014;Degertekin and Geem 2016;Saka, Hasançebi, and Geem 2016;Yang, Bekdaş, and Nigdeli 2016).…”