Inherent Strain Research Of Cross-shaped Joint In Steel Structure

Applications of welding technology in modern industrial manufacturing have played an important role, and have been widely used in a variety of steel connections. Welding process is extremely complex, many parameters involved changing instantaneously over time, and the distribution is uneven and strongly nonlinear. Correct understanding of the characteristics of welded structures and understanding of the specific welding process is the basis for application of welding technology. Therefore, the accurate prediction of residual stress and welding deformation generated in the process of welding is very important. Inherent strain method is an effective way to predict welding deformation. Studying inherent strain methods of some common welded joints can help to predict welding deformation easily.The detailed status and description of welding results at home and abroad were explained in first half of this paper, main explanations around the prediction of welding deformation started. The hot plastic finite element theory and the inherent strain theory were given a more detailed exposition in this paper. Using ANSYS10.0 finite element software and thermal elastic-plastic finite element model, the detailed analysis of inherent strain steel cross node were given based on the inherent strain theory in latter of this paper. The purposes were to validate the validity of the software and theory, meanwhile, give some suggestions of the inherent strain of research methods for specific structure.With the heat-structure coupling function of ANSYS software and the indirect method, analyzed the calculation of the temperature field firstly, made the node temperature effect on the structure of units by the load form in temperature field analysis, then analyzed the welding stress and strain, therefore, can help to understand the specific order of welding temperature field and strain. Analyzed the longitudinal strain results obtained by numerical simulation under the concept of Tendon Force, validate the accuracy of solving method for the inherent strain by comparison with the theoretical results. The proposed simulation method in this paper can be extended to the calculation analysis of joints with variety of sizes, various forms in the welding process. These results provide the reference for the study complex structure joints.