In the field of building construction, mass consumption of wood materials contributes to reforestation as well as to reduce environmental burden. At present, a composite steel-timber structure has been used in several building structures and is expected to be used even more widely in the future. The authors proposed the composite steel-timber structure which system is based on a damage-controlled structure. This structural member is composed of steel and glued laminated timber. In this paper, a design method of the composite steel-timber structure using buckling-restrained knee braces is proposed on the previous experimental tests. A trial design is conducted where applicability of the design method is shown.%環境負荷削減のための対応として建築構造分野では、木質材料を可能な限り多く使用することで森林再生に貢献しょうとする試みが模索されている。しかしながら、従来の木質構造では耐荷性能や耐火性能の問題から、4階建て以上に適用することに難があるとされている。このため、木質材料を中低層規模の建物などに適用することを目指した鋼木質複合構造が期待されている。
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