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Design range of the damper of a T-stub damage-controlled system Accepted 31 July 2019 abstract Among passive energy dissipation methods, beam-to-column connection damage-controlled systems are more strongly influenced by the strength and stiffness ratios of adjacent members than conventional brace- and stud-type methods. This difference is due to the positional characteristics of the damper, in contrast with those of the conventional methods. Nevertheless, studies on the practical design of beam-to-column connection damage-controlled systems remain insufficient. The purpose of this study is to find the optimal design range of a steel seismic damper for a high-performing T-stub damage-controlled system. To achieve this, a full-scale quasi-static cyclic loading experiment was performed to analyze improved load-carrying performance of the T-stub damage-controlled systems. The results found that refocusing the seismic loads distributed along the con-nections in the structural frame on to the damper can isolate the vibrations and maximize passive energy dissi-pation, thus providing earthquake resistance. The results also were utilized to design the moment connections to study the transfer of bending moments from beam to column. Furthermore, to derive the optimal design of the seismic damper, an analysis model capable of simulating the real-time behavior of various T-stub damage-controlled systems under heavy vibrational loads was developed. A multi-parameter analysis was then con-ducted to determine damper-to-beam strength and stiffness ratios and damper-to-column strength ratios. The results further helped in analyzing the plastic strain energy of each element in the connections to determine whether the connections could act as a damage-controlled system. منبع 10.1016@j.jcsr.2019.105719.pdf