带肋异形K形相贯节点静力性能研究

Study on the Static Performance of Stiffened K-joints with Special-Shaped Section

首先对带肋异形截面K形相贯焊接节点进行缩尺模型试验,分析了节点在复杂受力工况下的应变发展过程,随后建立并验证了带肋异形K形相贯节点有限元模型。通过有限元计算对比分析了带肋节点和不带肋节点的应力分布、破坏模式和极限承载力,最后计算比较了节点在不同内外加劲厚度条件下的极限承载力。结果表明内、外加劲能够有效降低节点相贯区域应力,带肋节点相贯区达到材料断裂应变而发生破坏,带肋节点的极限承载力为不带肋节点的1.8倍,增大加劲板的厚度也可一定程度增大节点极限承载力。

A scaled model test of a stiffened K-joint with special-shaped section is carried out firstly,and then a finite element model of the K-joint is built and verified.This model is used to analyze the stress distribution,failure mode and ultimate bearing capacity of the stiffened and unstiffened K-joints.Finally,the ultimate bearing capacity of the Kjoints under different internal and external stiffening thicknesses are calculated and compared.The results show that internal and external stiffening can effectively reduce the stress in the intersecting area of the K-joint.The intersecting area of the stiffened K-joint reaches the material fracture strain and fails,and the ultimate bearing capacity of the stiffened K-joint is 180%as that of the unstiffened K-joint.Increasing the thickness of the stiffening plate can also slightly increase the ultimate bearing capacity of the K-joint.