Semnan University Press Journal of Rehabilitation in Civil Engineering 2345-4415 14 3 2026 08 01 Impact of rigid and semi-rigid connections on dual-steel frames with various bracing systems using non-linear dynamic analysis 10520 10.22075/jrce.2025.2442 EN Hossein Khosravi Assistant Professor, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Iran Mahdiye Shahri Department of Civil Engineering, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran Mohammad Bahram Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Iran Journal Article 2025 09 12 During the occurrence of various earthquakes, the formation of local cracks in the connections of the steel frames is regarded as a main problem. Hence, scholars have paid a special attention to the application of steel frames with semi-rigid connections. So far, the frames with semi-rigid connections are rarely utilized, which is mainly due to their high drift rate. In the present article, the impact of semi-rigid connections on the dual-steel frames with various bracing systems was assessed using non-linear dynamic analysis. For accomplishing the analysis, the PERFORM 3D Software was used and the bilinear models were used for modelling the behavior of frames' members. The parameters investigated include maximum base shear, period, frames' drift and energy depreciation of dual systems. The obtained results indicated that the semi-rigid connections lead to decrease in the base shear, while the braces of dual system compensate the increase of drift resulted from utilization of semi-rigid connections. https://civiljournal.semnan.ac.ir/article_10520_905d3db9c5fcffe5641bfc8921e9acf6.pdf