半逆作法地下空间钢管混凝土柱的节点设计

Joint Design of Concrete-filled Steel Tubular Columns in Underground Space by Semi-top-down Construction Method

摘要:

针对南京某采用半逆作法的超大型地下空间钢管混凝土柱设计实例，提出了适用于工程改进的梁柱节点形式，总结了环梁-环形牛腿梁柱节点的传力机制及设计流程，对工程中的抗弯最不利节点进行了有限元补充分析，以期为类似设计提供有益的参考。结果表明，该节点能够满足承载力需求，但应在配筋时进行局部加强。

Abstract:

Based on a design case of concrete-filled steel tubular columns in a super-large underground space by the semi-top-down construction method in Nanjing, the beam-column joints improved suitably for the project are proposed. The force transmission mechanism and design process of ring beam - ring corbel beam joints are summarized. The supplementary finite element analysis of the most adverse bending joint is carried out in order to provide a beneficial reference for the design of the similar projects. The results show that this kind of joint can meet the requirements of bearing capacity, but the local reinforcement should be carried out when reinforcing bars.