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为了研究冷弯薄壁卷边槽钢轴心受压构件的极限承载力,对15根轴心受压的冷弯薄壁卷边槽钢进行了破坏性试验,并采用有限元分析方法对试件进行模拟分析,有限元计算结果与试验结果吻合良好,验证了有限元方法的有效性,然后对典型截面构件进行大量的有限元参数分析。研究结果表明:冷弯薄壁卷边槽钢轴心受压构件的极限承载力随着构件翼缘宽厚比、腹板高厚比、长细比以及钢材强度的增大而减小。通过参数分析得到了考虑局部屈曲、整体屈曲和畸变屈曲影响的构件屈服强度折减系数,提出了冷弯薄壁卷边槽钢轴心受压构件承载力计算的折减强度法及其相应计算公式,且通过试验验证了本文折减强度法计算卷边槽钢轴心受压构件极限承载力的适用性。
In order to study the ultimate bearing capacity of the cold-formed thin-walled curled channel axial compression member, the destructive test of 15 cold-formed thin-walled curled channel with axial compression was carried out. The finite element analysis The simulation results show that the finite element method is in good agreement with the experimental results, and the validity of the finite element method is verified. Then, a great deal of finite element analysis of typical cross-section members is carried out. The results show that the ultimate bearing capacity of cold-formed thin-walled curled channel steel axial compression member decreases with the aspect ratio, web thickness-to-thickness ratio, slenderness ratio and strength of steel. Through the analysis of parameters, the yield strength reduction factor of the member considering the local buckling, the overall buckling and the distortion buckling is obtained. The reduced strength method and its corresponding calculation for calculating the bearing capacity of the axially compressed member with cold-formed thin-walled curled channel are proposed Formula and validates the applicability of the reduced strength method in this paper to calculate the ultimate bearing capacity of curled channel steel axial compression members.