NON-LINEAR FINITE ELEMENT ANALYSIS ON THE SPATIAL CAST-STEEL JOINT CONNECTING MULTIPLE MEMBERS

摘要

To research on a large spatial cast-steel joint, the nonlinear finite element analysis compared with the experiment results are carried out by ANSYS Workbench. First, the experiment is introduced briefly. Then, the finite element analysis results including the maximum stress, the stress distribution from the end of the cast steel tube to the drum-shape body, the external and internal stress and strain distribution of this cast steel joint and so on, are presented. By comparing the results of the experiment and the finite element analysis of the cast-steel joints, it is shown that stress distribution between them is similar. Finally, the full process analysis results of the joint are put forword, which show that the loading process can be classified as three stages, elastic stage, elastic plastic stage, and finally plastic damage stage. At the ultimate state, most of the steel tubes reach yield strength, while in the drum-shape body of the joint, only a small part of region is in yield status, most of the other region is in low stress status. Since this is a nondestructive experiment, the nonlinear finite element analysis is complement to the experiment, which revealed the following characteristics of the joint after the ultimate load of the experiment. The analysis shows that the ultimate load of the model is 2.97 times the design load, and the bearing capacity of the joint is higher than the connecting member, so the design of the joint is safe and reasonable.