船舶工程

节点区域填充混凝土的KK形空间相贯

钢管节点静力性能试验

王雪迪¹，王宇航²，尹禧龙¹，张  晓¹，程万鹏^2*

（1．上海勘测设计研究院有限公司，上海  200335；2．重庆大学 土木工程学院，重庆  400045）

摘  要：[目的]为研究节点区域处填充混凝土对KK形空间相贯节点力学性能的影响，[方法]设计节点区域处填充混凝土的KK形相贯节点与空钢管KK形相贯节点等2类试件。将试件4根支管端部铰接并在主管端部施加轴向拉力进行加载，以获得试件的破坏模式、承载力及荷载-位移曲线。[结果]结果表明：空钢管KK形空间相贯节点更容易在受压支管附近处主管发生塑性破坏；在填筑混凝土后，节点失效模式转变为受拉支管附近处主管的冲剪破坏，这说明内填混凝土可以有效地提升节点力学性能。将试验结果与规范中空钢管相贯节点的冲剪破坏承载力计算公式及现有KK形钢管混凝土空间相贯节点进行对比，发现规范及现有研究提出的承载力计算公式均偏于保守。[结论]研究成果可为KK形相贯节点设计提供一定参考。

关键词：海上风电导管架；KK形空间相贯节点；节点混凝土；主管塑性破坏；冲剪破坏

中图分类号：TU398+.9    文献标志码：A    DOI:

Experimental on the Mechanical Behavior of Multiplanar Thin-Walled Circular Steel Tubular KK Joints with Concrete Filled in the Joint Area

WANG Xuedi¹, WANG Yuhang², YIN Xinlong¹, ZHANG Xiao¹, CHENG Wanpeng^2*

(1. Shanghai Investigation Design and Research Institute Co., Ltd., Shanghai 200335, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China)

Abstract:  [Purpose] To investigate the effect of concrete filling in the joint area on the mechanical performance of multiplanar thin-walled circular steel tubular KK joints, [Method] two specimens are designed: one filled with concrete in the joint area, and the other left empty. By hinge-connecting the ends of the four braces of the specimens and applying axial tensile force at the end of the chord, the failure modes, ultimate capacity, and load-displacement curves of the two specimens are obtained. By hinge-connecting the ends of the four braces of the specimens and applying axial tensile force at the end of the chord, the failure modes, ultimate capacity, and load-displacement curves of the two specimens are obtained. [Results] The test results indicated that circular steel tubular KK joints are more susceptible to plastic failure in the chord near the compressed brace. After filling with concrete, the failure mode shifted to punching shear failure in the chord near the tensile brace, demonstrating that the infilled concrete significantly improves the joint's mechanical performance. The test results are compared with the specification's punching shear bearing capacity formulas for circular steel tubular KK joints and existing multiplanar thin-walled circular concrete-filled steel tubular KK joints, revealing that these formulas are found to be relatively conservative. [Conclusion] The research results can provide some references for the design of KK joints.

Key words:  offshore wind turbine jacket; multiplanar thin-walled circular steel tubular KK joints; joint concrete; plastic failure of the chord; punching shear failure