RCST構法による段差梁柱接合部の静的載荷実験
RCST(Reinforced Concrete Steel Tube)構法とは、現場溶接作業を要さない施工合理化構法である。本構法では、柱と接合部内部に打設するコンクリートおよび接合鉄筋によって上下階を接合する。適用範囲拡大のため、床段差を伴う建築計画に対して有用な、段差梁を用いたRCST十字形接合部について静的載荷実験を行った。段差梁接合部の荷重変形関係や破壊性状などの基本的性能を把握すると共に、接合部構成要素の応力分布と接合部せん断力分担状況を分析し、段差梁接合部のせん断設計法を検討した。
Static Loading Tests on Offset Beam-Column Joints Constructed by RCST Composite System
The composite frame system known as RCST (Reinforced Concrete Steel Tube) allows columns and beams to be jointed without welding. Concrete is cast inside the tubes and connecting rebars are arranged through upper/lower columns and the joints, leading to improved building construction productivity. In order to extend the range of application, the authors have performed static loading tests on interior offset RCST joints where beams join columns at different levels, an effective design option for architectural planning with floors on varying levels. This paper describes the behavior modes and failure processes of these joints. An investigation of the stress distribution and shear force balance among elements of the joints leads to a design method for evaluating the shear capacity of offset RCST beam-column joints.