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ANALYSIS ON DISTORTIONAL BUCKLING OF COLD-FORMED THIN-WALLED STEEL LIPPED CHANNEL STEEL MEMBERS WITH WEB OPENINGS UNDER AXIAL COMPRESSION
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摘要: 采用通用有限元软件ABAQUS,对冷弯薄壁型钢卷边槽形截面轴压构件的腹板开孔的类型、开孔大小、开孔位置等参数进行分析,研究腹板开孔对构件发生畸变屈曲时屈曲稳定系数k值的影响。结果表明:开孔位置会影响其屈曲模式;多孔间距存在一个安全距离;腹板开圆孔或长圆孔时,构件屈曲系数k有着不同程度的降低。根据影响开孔构件畸变屈曲的主要参数,提出了开孔构件的端距限值和孔间距限值;对腹板开圆孔和长圆孔冷弯薄壁卷边槽钢轴压构件的畸变屈曲稳定系数进行分析并给出了相应的建议计算式。Abstract: The finite element software ABAQUS was used to analyze the influence on the k value of the elastic distortional buckling stability coefficient considering changing of the type of opening, the size and the position of opening in the paper. The results showed that the position of the opening would affect the buckling mode of members, there was a safe distance between the openings, and the buckling stability coefficient k of the members with circle or slotted opening in web had different degrees of reduction. Finally, according to the main influencing parameters, the limits of end distance and distance between the opening were presented, some relative simple formulas were proposed to calculate the distortional buckling stability coefficient of cold-formed thin-walled lipped channel steel members with circle or slotted opening in web.
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