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针对屈服强度550MPa高强冷弯薄壁型钢轴压构件提出了一种控制畸变屈曲的构造措施——在卷边间设缀板,并通过试验对其有效性进行了验证。试验结果表明:屈服强度550MPa高强冷弯薄壁型钢卷边槽形截面轴压构件易发生畸变屈曲,通过构造措施能有效地阻止翼缘的转动,试件的畸变屈曲荷载和极限承载力都有很大的提高;随着缀板布置间距的不同,构件承载力的提高幅度也不同;缀板间距越小,试件承载力提高越多,但当缀板间距大于畸变屈曲半波长时,缀板不能起到提高承载力的作用。最后,在此基础上提出了构件不考虑畸变屈曲影响的若干条件,供实际设计参考。
In order to deal with the high strength cold-formed thin-walled steel member with yield strength of 550MPa, a kind of structural measure to control the distorted buckling is proposed. The test results show that the yield stress of 550MPa high-strength cold-formed thin-walled steel is likely to be distorted and buckled. The structural buckling can effectively prevent the flange from rotating, and the distorted buckling and ultimate bearing capacity of the specimen are And the improvement of bearing capacity is also different. The smaller the spacing of the slab is, the more the bearing capacity of the specimen is increased. However, when the slab spacing is greater than the distortion half wavelength, Board can not play the role of raising the carrying capacity. Finally, based on this, some conditions that the component does not consider the influence of distorted buckling are put forward for the practical design reference.