空间KT型圆管搭接节点静力性能研究Ⅱ——承载力回归公式

Static behavior of multiplanar overlapped CHS KT-joints Ⅱ: Design equation

在有限元模拟和参数分析的基础上,分别定义了空间调整系数和腹杆轴力比影响系数来考虑空间参数和各腹杆轴力相对变化对平面内外均搭接的空间KT型圆管相贯节点(空间KT-Ov型节点)极限承载力的影响,并进行了回归和校验,证明两个系数函数关系式均正确反映几何参数和荷载参数变化的影响,从而得到一个形式较为简单的空间KT-Ov型节点极限承载力计算公式;在此基础上,进一步提出承载力设计值建议公式Ⅰ和建议公式Ⅱ,经与试验数据和有限元数据的比较和统计分析,表明所提出的两个建议公式均具有较高精度和稳定性,可以较为安全可靠地用于空间KT-Ov型圆管节点的承载力设计。

Based on finite element analysis and multiple nonlinear regression analysis techniques, muhiplanar influencing coefficient/-μKz and web member axial force ratio influencing coefficient Qn, are respectively regressed to be a function for engineering application and calibration, indicating that the expressions for/XKT and Q. could appropriately reflect the effects of spatial parameters and load parameters on the ultimate bearing capacity. Hence, the design equations I and Ⅱ for the recommended values of muhiplanar unstiffened CHS KT joints with in-plane and out-of-plane overlapped （multiplanar KT-Ov joints ） are proposed. According to the comparison of experimental results and FE results, both design strength equations I and I] have good performances in accuracy and reliability. Hence, both the proposed strength equations I and II could be safely used to design the bearing eapacityof multiplanar CHS KT-Ov joints.