贯穿式加劲肋对螺栓连接钢管节点轴压承载力影响的试验研究

INFLUENCE OF PENETRATING STIFFENERS ON AXIAL BEARING CAPACITY OF BOLTED STEEL TUBULAR JOINTS

各国现行钢结构规范中,对螺栓连接钢管节点的极限承载力均未提及具体的构造措施及计算方法。通过对8个带加劲肋的螺栓连接钢管节点试件进行了单轴受压承载力试验研究,探讨了该类节点在单轴受压条件下的承载力-变形曲线和破坏模式,并对环板、主管及支管的应力-应变情况进行了分析。研究表明:仅通过单轴试验就推出所有破坏模式过于武断,建议限定说明,使其更合理;采用环板、十字连接板对支管与主管进行螺栓连接并设置加劲肋的钢管节点,其破坏模式为环板局部面外失稳,设置加劲肋能有效抑制整体的面外失稳;其次,加劲肋板贯穿主管可以提高节点的整体刚度和极限承载力,且施工方便,是值得采用的节点设计方法之一。

In the current steel design codes at home and abroad,the calculation method for the ultimate strength of a steel tubular joint with bolted connection has not been specified in detail.In the paper,the failure mode and the loaddisplacement behavior of 8 full-scale steel tubular joints with bolted connection subject to uniaxial compression were investigated experimentally.Moreover,the stress-strain distribution of annular plate,main chord and branch tube,were also discussed.The results showed that the failure mode of the steel tubular joint with bolted connection that using branch tube and main chord and installed rib stiffeners by annular plate and cross-connecting plate was local buckling.And the rib stiffener might effectively prevent the out-of-plane buckling of whole joint.The rib stiffener penetrating the main chord could improve the stiffness and ultimate strength of the steel tubular joint,and make construction convenient,which is worthy adopting as one of the joint design methods.