Bckling Behavior Of Single Cold-formed Angle Under Axial Loads

With the rapid development in Chinese economy,the steel structure and thin-walled colded-formed steel structures have been widely used in building constructions. The colded-formed angle members are one of important member in steel structures and are widely used in transmission towers,trusses and bracing members by its easy connection and erection.In this paper ,the buckling behavior of cold-formed angle members is studied by non-linear finite element method.The influence of the width-thickness ratio of the single cold-formed angle column under axial load is analysed. The criteria of flexural buckling and torsional-flexural buckling for cold-formed egual-leg under axial loads is presented. According the calculating results of the ANSYS finite element method, the stability-coefficient formulas are simulated for the cold-formed loading single angle members of flexural buckling and torsional-flexural buckling. The calculation results of ANSYS finite element method are compared with the experimental values and also compared with the results of the design-formulas in the Current China Specification GB50018-2002 and the unreasonable items in the specification GB50018-2002 about the axial load cold-formed angle members are pointed out and suggestion for improving the specification GB50018-2002 are also presented in this paper.