Research On Load Carring Capacity Of Wall Studs In Cold-Formed Thin-Walled Steel Residence

The steel wall frames with cold-formed thin-walled studs (U- or C-sections) are more commonly utilised in the construction of low-rise buildings. However, the loading behavior of wall studs used in the stud wall frames is not well understood and the related design rules are not available. Because of the initial geometric imperfections, residual stresses, the thickness of web and flange, and the restraint of track to stud, it is difficult to predict the bearing capacity of wall studs. Based on the latest experimental study abroad, the load-carring capacity of the wall studs has been analyzed in this text.In this text the finite element program ANSYS9.0 is applied to carry out the finite element nonlinear analysis of wall studs.The FEM models were then verified by the experimental results in terms of ultimate load-carrying capacity, failure modes. It is demonstrated that the FEM results agree well with the test results abroad. Hence, the verified FEM model was used as a baseline for an extensive parametric study of 75mm and 200mm wall studs.Through the parametric study, it can be seen that the 75mm studs failed by flexural buckling while the 200mm studs failed by global buckling. The parametric wich have played an important role in the ultimate load-carring capacity of the 75mm and 200mm studs are the thickness of track members and the flexural rigidity ratio of track to studs. The yield strength and the thickness of studs" members have little effect on ultimate load-carring capacity of wall studs. Furthermore, it is indicate that with the flexural rigidity ratio of track to studs increasing, the effective length factors of studs based on the ultimate load are approach to wich gained from members subjected to axial loads with two ends fixed. Predicting the effective length factors of wall studs as 1.0 is too conservative.