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对于冷弯薄壁型钢构件来说,目前的国外设计规范大多采用有效截面法来考虑局部屈曲对构件变形的影响。由于冷弯薄壁型钢构件的板件宽厚比较大,在正常使用阶段除了发生局部屈曲之外还可能发生畸变屈曲,从而影响构件的变形性能。通过探索一种无需求解构件的有效截面特性,利用全截面直接求解受弯构件整体弯曲变形的计算方法(简称“直接变形法”),在已有试验研究的基础上利用有限元程序ANSYS对试验进行模拟,结果表明,模拟结果与试验结果吻合较好。在此基础上,对直卷边、斜卷边和复杂卷边C形截面纯弯构件进行有限元参数分析。参数分析时,对于每个构件都提取了相应于每级荷载时构件的变形状况。通过对各参数及卷边形式的研究综合对比,分析各曲线散点的分布规律,分别建立了不同厚度的直卷边、斜卷边以及复杂卷边构件的直接变形法公式,从而使得构件变形的计算过程大大简化。
For cold-formed thin-walled steel components, the current foreign design specifications mostly adopt effective section method to consider the influence of local buckling on the deformation of the components. As the plate thickness of cold-formed thin-walled steel members is relatively large, in addition to local buckling during normal use, distortion buckling may occur, which may affect the deformation performance of the member. By means of exploring a kind of effective cross-section characteristic without solving the component and using the method of calculating the total cross-section directly to solve the overall bending deformation of flexural members (referred to as “direct deformation method”), based on the existing experimental research, the finite element program ANSYS The simulation of the test results show that the simulation results are in good agreement with the experimental results. On this basis, the finite element analysis of straight curled, inclined curled and complicated curled C-section pure curved members is carried out. In the parametric analysis, the deformation of the member corresponding to each load is extracted for each member. Through the comprehensive comparison of each parameter and the curling form, the distribution rule of each curvilinear scatter is analyzed. The direct deformation formulas of straight curl, oblique curl and complex curl members with different thickness are established respectively, The calculation process is greatly simplified.