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以矩形钢管为弦杆、圆管为支杆的混合空间钢管结构因形式新颖、相贯线切割简单而在大跨空间结构中逐渐得以应用,但因支杆的几何效应和荷载效应,导致混合型钢管空间相贯节点承载力计算比较复杂。采用非线性有限元方法,应用自动步长增量法研究了主方支圆空间KT节点的空间几何效应和荷载效应。理论分析表明:相比杆件的几何效应,荷载效应对节点极限承载力的影响更为明显,T形支杆上较大的轴力将使K形支管处极限承载力显著下降。通过对空间KT形节点极限承载力的分析,绘制平面K形、T形节点和空间KT形节点承载力相关曲线,并提出计算公式供设计人员参考。
Due to its novel form and simple cutting of intersecting lines, it is gradually applied in the long-span space structure. However, due to the geometric effect and the load effect of the supporting rods, the mixing space The calculation of bearing capacity of tubular joints is complex. The nonlinear finite element method is used to study the spatial geometry effect and load effect of KT node in the principal square branch space by using the automatic step increment method. The theoretical analysis shows that the effect of load effect on the ultimate bearing capacity of joints is more obvious than the geometric effect of bars. The large axial force on T-shaped struts will significantly decrease the ultimate bearing capacity of K-shaped branch pipes. Through the analysis of the ultimate bearing capacity of KT joints in space, the curves of bearing capacity of K-shaped K-joints, T-joints and KT-shaped joints are plotted, and the formulas are proposed for designers’ reference.