各国规范铝合金轴压构件局部稳定设计方法对比分析
首发时间:2012-12-25
摘要:铝合金作为一种优良的建筑材料,在建筑结构中应用广泛,但由于铝合金弹性模量低,受压构件局部稳定性尤其值得注意。目前国内外已有多本铝合金结构设计规范,设计方法有所差异,因此,本文对中国《铝合金结构设计规范》GB 50429-2007、欧洲规范EN 1999-1-1、美国铝合金设计手册、澳大利亚/新西兰规范AS/NZS 1664中受压构件局部稳定设计方法进行了总结分析,并通过算例给出了直观的说明。分析结果表明,中国规范和欧洲规范采用有效截面法,在板件宽厚比限值及厚度折减计算上,基本上采用了相同的参考标准及计算方法;美国铝合金设计手册和澳大利亚/新西兰规范采用许用应力法或抗力系数设计法/极限状态设计法,除了澳大利亚/新西兰规范引入了系数kc对屈服强度进行折减外,两个规范的设计方法基本一致。
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Comparison on design codes for local buckling of aluminium alloy columns under uniform compression
Abstract:As an excellent building material, aluminium alloy is widely used in structures. Since the elastic modulus of aluminium alloy is relatively low, the local buckling of compression members needs consideration. Now there are several design codes with different design methods, so comparison between Chinese (GB 50429-2007), European (EC9, EN 1999-1-1:2007), American (Aluminum Design Manual) and Australia/New Zealand (AS/NZS 1664) codes was made in this paper. Examples of aluminium alloy columns were also included. The results show that GB and EC9 adopt effective section method and choose same parameters when considering the maximum width- thickness ratio and effective thickness; ADM and AS/NZS adopt allowable stress design or resistance factor design/limit state design and AS/NZS is technically equivalent to Aluminum Design Manual except that AS/NZS adopt kc to reduce the yielding load.
Keywords: aluminium alloy compression members local buckling design code finite element analysis
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