方钢管混凝土柱-H型钢梁节点研究

Study on Joint of Concrete-filled Rectangular Tublar Column and H-shaped Steel Beam

方钢管混凝土柱-H型钢梁节点的结构性能影响钢管混凝土结构在住宅建筑中的推广和应用。在总结方钢管混凝土柱-H型钢梁铰接、半刚接和刚接节点类型的基础上,对目前常用的内隔板节点和新提出的外肋环板节点进行了理论分析与试验研究。基于屈服线理论推导了内隔板节点强度的计算公式,提出了基于静力平衡理论的外肋环板节点的强度计算公式。结合工程实践对这两种节点进行了静力拉伸试验,分析了节点的破坏机制。借助于试件的应变测量,研究了节点的应变分布规律和应力传递机制,得到了荷载位移曲线、节点的屈服强度和极限强度。理论计算结果与试验值分析比较表明,填充混凝土的内隔板节点和外肋环板节点具有较好的刚度和延性。

Structure performance of CFRT column H-shaped steel beam connection affects the development and appliance of structures with concrete-filled tubular members in residential buildings. On the basis of summarizing types of CFRT column H-shaped steel beam connection such as hinged joints, semi-rigid joints and rigid joints, theoretical and experimental studies on the behavior of this connections, including currently popular connection type-inner diaphragm joints and newly proposed connection type-vertical stiffener joints are presented. The yield mechanism lines theory is employed to study the strength of inner diaphragm joint, and calculating formula based on the balance of static forces is presented for vertical stiffener joint strength. According to practice of project, static tensile tests are performed on the two connection types and the constructive mechanisms are analyzed. In the presence of the measurement values of the strains on the specimens, strain distribution regularities and stress transfer mechanism are studied and the load-displacement cure of the joints are obtained, as well as the yield strength and the ultimate strength. Calculated results based on the proposed calculating theory are compared with experimental data, and it indicates that beth joints filled with concrete have preferable stiffness and ductility.