Study On The Compression Stability Performance Of C-Formed Column In The Low-lise Cold-formed Thin-wall Steel Residence

This paper mainly presents detailed results on the compression stability ultimate load bearing capacity of cold-formed steel C-formed column in low-rise residential steel structures by nonlinear finite element analysis based on consulting a lot of documents.Nonlinear finite element analysis involving geometric large deformation and materials nonlinear is used to simulate test columns under monotonic load in this paper. Members are modeled as shell elements. The equation resolution method is selected as arc-length method. The finite element analysis results are close to that of the tests, so the finite element analysis method is correct.Using nonlinear finite element analyse,the study followed by a detailed parametric is carried on. The results of finite element analyse are compared with that of techinical code calculate. The results of finite element analyse show that the initial imperfections of C-formed column influence the ultimate resistance of columns greatly .The column's ultimate load bearing capacity increases obviously with the increase of web width,seam width, thickness,and the decrease of the height. With the increase of flange width, the column's ultimate load bearing capacity increases reduces after the first increase. Under one-way eccentric load, when the flange width is smaller, the ultimate capacity of the members decreases with the increase of positive and negative eccentricity. When the flange width is not large, the ultimate capacity of the members increases firstly and then decreases with the increase of positive eccentricity, and decreases with the increase of negative eccentricity. When the flange width is large, the ultimate capacity of the members increases firstly and then decreases with the increase of positive and negative eccentricity. Under two-way eccentric load, when the load point is in the Z-axis positive direction, the ultimate capacity of the members decreases with the increase of X -axis direction eccentricity. When the load point is in the Z-axis negative direction, increases firstly and then decreases with the increase of X -axis direction eccentricity. A formulation of stability checking for uniaxial symmetry section biaxial bending components is proposed.