Development ofCFT connections utilizing reinforcing bars

内置钢筋的钢管混凝土节点，在钢管内部设置肋、环、隔板等用于填充混凝土的机械抗剪键，可以实现钢管与钢筋之间的应力传递。钢管混凝土柱节点中钢筋的应力传递促使了新型钢管混凝土柱节点的发展，如无焊接钢管柱节点、无底板柱脚、无锚栓柱脚等，使建筑施工简单、经济。此外，这种没有钢焊接的连接概念将是扩展具有焊接困难的700 N/mm 2等级钢的使用的解决方案之一。本研究通过系统的实验证明了上述实用性

The concrete-filled steel tube (CFT) connections with built-in reinforcing bars enables the stress transmission between a steel tube and the reinforcing bars, when mechanical shear keys for the filling concrete such as ribs, rings or diaphragms are installed in the interior of steel tube. The stress transmission through reinforcing bars in CFT connections induces development of new connection style such as steel tubular column joints without welding or column bases without base plate nor anchor bolts, which make the building construction easy and economical. Furthermore, this connection concept without steel welding would be one of the solutions to extend the use of 700 N/mm2 grade steel which has a difficulty of the welding. This study proved the above-mentioned utility from a systematic experiment