The double reduced beam section (DRBS) connection is a newly developed steel moment connection. In this paper, the chaotic particle swarm optimization technique was utilized to optimize this connection for the best seismic performance. The resulting optimum DRBS connection shapes showed up to 39% better energy dissipation and up to respectively 50% and 55% lower rupture index (RI) and equivalent plastic strain (PEEQ) at the beam-column interface, compared to the conventional RBS connection. Also, the optimum design parameters determined in this paper led to up to a 28% increase in the objective function (energy dissipation) and up to respectively 36% and 38% decreases in the RI and PEEQ with respect to the original DRBS connection, indicating noticeable seismic performance enhancements. The results indicated that changing the size of the beam and column sections does not lead to any significant change in the optimal shape of the beam flange cut or the seismic performance of the connection.

双减梁截面（DRBS）连接是一种新开发的钢力矩连接。在本文中，利用混沌粒子群优化技术来优化这种连接以获得最佳抗震性能。与传统的 RBS 连接相比，由此产生的最佳 DRBS 连接形状的能量耗散提高了 39% ，梁柱界面处的断裂指数 ( RI ) 和等效塑性应变 ( PEEQ )分别降低了 50% 和 55% 。此外，本文确定的最佳设计参数使目标函数（能量耗散）增加了 28%，RI和PEEQ分别减少了 36% 和 38%相对于原始 DRBS 连接，表明显着的抗震性能增强。结果表明，改变梁柱截面尺寸不会导致梁翼缘切割的最佳形状或连接的抗震性能发生任何显着变化。