The reuse system mentioned in this paper is an overall system for realizing a reuse business in a cyclic process of design, fabrication, construction, maintenance, dismantling, and storage. The reuse system mainly aims at reusing building steel structures that have already constructed. On the other hand, the sustainable building structure aims at reusing new building steel structures in the future. This structure is one form of a damage-controlled structure. Clearly separating the main structure from seismic energy absorption members keeps the main frame within the elastic range, and the seismic energy absorption members can collectively absorb the seismic energy force. The continued use of the main structure is possible by replacing only earthquake-damaged braces where necessary; reusing structural members is also possible. In this paper, the authors verify that the sustainable building structure is suitable for reusing structural members through trial construction. Then, easiness of erection and dismantling of sustainable building structure is evaluated.

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.

To reduce the global environment load, a sustainable building structure system (SBS), which is one of the damage control structures, has been researched and developed. However it is difficult for this system to apply conventional facade panels in case of a huge earthquake. In this study, the authors propose a new facade panel system that suits to large story deformation angle of the SBS. Basic performance of the proposed system is confirmed by experiments using scale-down model that have rotational pin and slipping connections.

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