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对各国规范以及Winter公式关于工字形截面构件有效宽度的计算公式进行简要介绍,并采用各国规范方法和有限元数值模拟对腹板不同宽厚比和构件不同长细比的工字形截面轴压构件有效面积进行计算和分析。结果表明:《门式刚架轻型房屋钢结构技术规程》(CECS102:2002)在腹板宽厚比较大时有效面积过于保守,《钢结构设计规范》(GB50017—2003)、欧洲规范(E3-1.5:2006)对于长细比较大构件有效面积过于保守,《冷弯薄壁型钢结构技术规范》(GB50018—2002)、美国规范(AISC:2005)以及Winter公式与数值结果吻合较好,且有一定的安全度,建议对于薄腹工字形截面轴压构件有效面积可采用《冷弯薄壁型钢结构技术规范》(GB50018—2002)计算方法进行计算。
The calculation formulas of the effective widths of the I-shaped cross-section members and those of the Winter formula are briefly introduced. The normalized method and finite element numerical simulation are used to validate the I-shaped cross-section axial compression members with different aspect ratios and different slenderness ratios of the webs Area calculation and analysis. The results show that the effective area is too conservative when the web width-thickness ratio is relatively large, and the “Steel Structure Design Code” (GB50017-2003), the European Code (E3-1.5 : 2006) is too conservative for the effective area of the slenderness larger member. The technical specifications of the cold-formed thin-walled steel structure (GB50018-2002), the United States Code (AISC: 2005) and the Winter formula agree well with the numerical results, It is suggested that the effective area of thin-belly I-section axial compression members can be calculated by the calculation method of Technical Specification for Cold-formed Thin-walled Steel Structure (GB50018-2002).