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A sustainable building steel structure system, which is kind of damage-controlled structure, consists of columns, beams and newly developed connections with buckling-restrained braces like knee brace. The columns and beams are connected with special long steel bars alone, facilitating demolition of the structure and able to be reused the members. Since the connections of beam-to-column are semi-rigid, the columns and beams suffer no damage. The buckling-restrained knee braces only absorb seismic energy. In the past studies, full-scale tests of the connection were carried out. Based on these results, structural models, which modeled the connection were analyzed and a mechanical model for the sustainable building structure system was established. In this paper, a structural design method is proposed on the previous experimental and analytical studies. The detail design method for the newly developed connections with buckling-restrained braces is established. A trial design is conducted where applicability of the design method is shown.

Loading tests for sustainable building structural system on the past studies have not considered the axial force applied to the beam-to-column connection. These tests have also not considered the change in the rigidity with the floor. Therefore, the effectiveness of the axial force and the floor was indefinite. This study verifies the effectiveness of the floor and the axial force by the behavior of the specimens that set partial frames for sustainable building structural system of one layer one span.