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对不锈钢焊接箱形截面柱的局部-整体相关稳定承载力计算方法进行比较分析,以实现经济合理的截面设计。根据现有的试验数据和得出的大量有限元数值计算结果,对国外现行的不锈钢结构设计标准——欧洲规范EN 1993-1-4、美国规范ASCE 8-02、澳大利亚和新西兰规范AS/NZS 4673,以及GB 50018—2002《冷弯薄壁型钢结构规范》和北美冷成型钢结构规范AISI S100进行比较分析。结果表明:ASCE 8-02、AISI S100和GB 50018高估了构件的相关稳定承载力,而EN 1993-1-4没有充分考虑不同牌号不锈钢材料性能的差异,澳大利亚和新西兰规范AS/NZS 4673对每种牌号的不锈钢单独确定设计曲线时应用较为繁琐。基于EN 1993-1-4的计算公式,针对奥氏体型和双相型两类不锈钢提出了通用的计算修正系数,通过试验数据和有限元数值算例的验证,表明了修正计算系数的准确性和适用性。
The calculation method of the partial-overall relative stable bearing capacity of stainless steel welded box-section columns is comparatively analyzed in order to realize the economical and rational section design. According to the existing experimental data and numerical results of a large number of finite element calculations, the current foreign stainless steel structural design standards - the European norms EN 1993-1-4, the United States norms ASCE 8-02, Australia and New Zealand norms AS / NZS 4673, and GB 50018-2002 “cold-formed thin-wall steel structure specifications” and the North American cold-formed steel structure AISI S100 comparative analysis. The results show that ASCE 8-02, AISI S100 and GB 50018 overestimate the relative stable loading capacity of components, while EN 1993-1-4 did not take full account of the differences in the performance of different grades of stainless steel materials. Australian and New Zealand norms AS / NZS 4673 pairs Each grade of stainless steel to determine the design curve alone is more cumbersome. Based on the calculation formula of EN 1993-1-4, a general calculation correction coefficient is proposed for two types of austenite and two-phase stainless steels. The experimental data and the finite element numerical examples show that the correction coefficient is accurate Sexuality and applicability.