偏心受压作用下铸钢分叉节点受力性能试验研究

为了了解树状柱结构中的铸钢分叉节点在轴力和弯矩共同作用下的受力性能,对一个典型的铸钢三分叉节点进行了足尺模型偏心受压试验,试验在1 000t微机控制电液伺服压力试验机上进行,对铸钢三分叉节点主管进行偏心加载,偏心距200mm,分析了节点的位移变化和应力分布特征。采用Solid Works软件建立与试验节点相对应的分析模型,然后导入ANSYS软件对该节点进行有限元计算,将其计算结果与试验结果进行对比。进而提出了基于主管破坏的节点承载力计算公式。研究结果表明,试验结果、有限元计算结果及承载力计算公式计算的结果三者吻合较好,节点在受压侧与受拉侧的应力水平差异明显,弯矩作用影响显著。

Experimental study on mechanical behavior of cast-steel joint with branches under the action of eccentric compression

In order to understand the mechanical behavior of the cast-steel joints with branches in the tree-like column structure under the action of axial force and bending moment,a typical cast-steel three-branch joint was subjected to the full-scale model eccentric compression test. The experiment was carried out on a 1 000 t micro-computer controlled electro-hydraulic servo pressure tester. The main pipe of cast-steel three-branch joint was loaded eccentrically with an eccentricity of 200 mm. The displacement variation and stress distribution characteristics of the joint were analyzed.Solid Works software was used to establish the analysis model corresponding to the test node,and then ANSYS software was imported to calculate the joint by finite element method,and the results of calculation were compared with the test results.Furthermore,a formula for calculating the bearing capacity of joints based on the failure of the main pipe was proposed. The results show that the test results,the finite element calculation results and the calculation results of bearing capacity calculation formula are in good agreement. The stress levels of the joints at the compression side and the tension side are obviously different,and the bending moment effect is significant.