同济大学学报（自然科学版）2026，Vol.54Issue(1)：54-64,11.DOI:10.11908/j.issn.0253-374x.24300
圆钢管KK'X型节点性能的参数分析与设计公式
Parametric Analysis and Design Formulas for Circular Hollow Section KK'X Joints
摘要
Abstract
Parametric analysis for the ultimate bearing capacity(UBC)of multiplanar KK'X gap joints in circular hollow section(CHS)trusses is conducted using the finite element(FE)model validated by tests.The study reveals that τK and τX have minimal impact on the UBC of the joints,whereas other geometric parameters exert a greater influence.UBC of K-brace significantly decreases with the increase of axial force in the X-brace.The axial compressive force in the chord member adversely affects the UBC,while axial tension has little impact.Based on the calculation formulas for UBC of uniplanar K-joints in design standard of steel structures,the formula for UBC of multiplanar KK'X joints subjected to axial force on K-brace with chord plasticization failure is proposed by means of geometric adjustment coefficient μKKX and influence coefficient ψm considering the ratio of axial force between braces.The accuracy of this formula has been validated by FE analysis and experimental data.Using the calibration method prescribed in design standard of steel structures,a design formula for UBC of multiplanar CHS KK'X joints is finally recommended,providing a practical design guideline for the engineering application of this type of complicated tubular joints.关键词
空间KK'X型圆钢管节点/参数分析/主管塑性破坏/极限承载力/设计公式Key words
circular hollow section(CHS)KK'X joints/parametric analysis/plasticization failure of chord member/ultimate bearing capacity(UBC)/design formula分类
建筑与水利引用本文复制引用
童乐为,菅广跃,颜阳,赵成云,张得旺,吴斌..圆钢管KK'X型节点性能的参数分析与设计公式[J].同济大学学报（自然科学版）,2026,54(1):54-64,11.基金项目
上海市高峰学科建设项目(2019010301) （2019010301）
中铁上海院集团科研计划(集-20-63) （集-20-63）
