空间X+双KK型圆钢管焊接节点静力性能试验研究

Experimental Study on Static Behavior of Space X+double KK-joints

对空间X+双KK型圆钢管节点的静力性能进行了加载的试验研究。介绍了节点试验方案,考察了节点的破坏性状及其承载力,检验节点构造措施是否合理,验证了实际结构节点分析建立的有限元模型的适用性以及应力分布特点和计算结果的正确性。X+双KK试件在设计荷载作用下各腹杆及节点区工作性能良好,各杆件均处于弹性阶段。加载至设计荷载2.0倍时,节点区受拉腹杆处测点首先进入屈服,加载至3.15倍设计荷载时,控制腹杆全截面屈服,节点区弦杆测点应力水平较小。随后,其它腹杆也进入屈服,节点区进入塑性且变形发展到弹性变形3倍以上时仍未发生断裂。指出在实际结构中,为得到与试验节点相似的承载力水平,焊接节点的腹杆与弦杆的相贯焊缝质量应加强监控。节点的有限元分析结果与实测结果最大误差为16.5%。

To study the static behavior of circular hollow steel space X ＋ double KK-joints, one specimen was tested under monotonic loading. The test procedure and joint failure were presented in this paper. The results verify the actual structure analysis of finite element model of the joints in the applicability, stress distribution characteristics and the correctness of the calculation results. Under design load,the node area of X ＋ double KK specimen work performance is good, all bars work in elastic stage. Under 2.0 times design load, the tensile abdomen of joint braces first yields. Loaded to 3.15 times design load, the control braces section all yields, chord stress of joint is small this time. Then, the other braces also enter submission. When plastic deformation is 3 times elastic deformation there is no fracture phenomenon. There is a maximum error of 16.5% between the finite element analysis results and the measured results.