钢管混凝土平面相贯节点轴压承载力理论研究

Theoretical Investigation into Axial Bearing Capacity of Planar Intersecting Connections of Concrete-Filled Steel Tube

针对两种新型节点构造形式,通过分析带不同厚度钢板的钢管混凝土短柱的轴压承载力,提出了相贯节点轴压承载力的计算公式.同时,采用有限元方法对节点静载试验进行了模拟,并分析了斜交角度、椭圆拉板厚度、衬板厚度、环向加强板和法兰板厚度等参数对节点承载力的影响,有限元分析与试验结果吻合较好.结果表明:节点中椭圆拉板、衬板和环向加强板可提高对核心混凝土的约束效应;随着斜交角度、椭圆拉板厚度、衬板厚度的增加,节点承载力有所提高,而环向加强板或法兰板的厚度对节点承载力影响不大;计算公式能较准确地估计节点的承载力,可用于工程实践.

In this paper,first,the axial bearing capacities of short concrete-filled steel tubular （ CFST） columns with thickness-variable steel plate and with two novel types of intersecting connections are analyzed,and the corresponding calculation formula is proposed. Then,the static loading tests of the two types of connections are simulated using the finite element method,and the variations of the bearing capacity with the intersecting angle as well as with the thickness of the elliptical plate,the lining plate,the reinforcing plate and the flange plate are analyzed, the results according well with the test ones. It is found that the elliptical plate,the lining plate and the reinforcing plate all enhance the confinement effect on the core concrete,that the bearing capacity of the connections increase with the intersecting angle as well as with the thickness of the elliptical plate and the lining plate,while it is insensitive to the thickness of the reinforcing plate and the flange plate,and that,the proposed formula is applicable due to its high accuracy of estimating the bearing capacity of connections.