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1969年颁发的《弯曲薄壁型钢结构技术规范》(草案)第43条给出的梁的整体稳定系数φ_ω的计算公式,系根据上翼缘受有均布荷载(荷载平行于截面主轴并通过弯心)简支工字型薄壁型钢梁的试验研究成果整理得出的,未考虑梁截面形状、横向荷载类别及位置等因素的影响;该计算公式比较烦冗,在弹塑性区域内φ_ω的修正值φ′_ω的取值亦偏高。针对上述情况,新规范(TJ18—75)分别考虑了梁的截面形状、侧向支承的
The formula for the overall stability factor φ_ω of a beam given in Article 43 of the Technical Specification for a Thin-Walled-Shaped Steel Structure (Draft) issued in 1969 is based on the fact that the upper flange is subjected to a uniform load (the load is parallel to the main axis of the section and passes The results of the experimental research on the simply supported I-shaped thin-walled steel girder have been obtained without considering the influence of the cross-sectional shape of the beam, the type and location of the lateral load, etc.; this calculation formula is rather tedious and in the elastic-plastic zone. The correction value φ′_ω of φ_ω is also high. In view of the above situation, the new specification (TJ18-75) considers the cross-sectional shape of the beam and the lateral support respectively.