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工业建筑  2009 

各国钢结构设计规范中受弯构件稳定设计的比较

DOI: 10.13204/j.gyjz200906002, PP. 5-12

Keywords: 弯扭屈曲,等效弯矩系数,闭合解

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Abstract:

比较了在美国ANSI/AISC360—2005,英国5950—1—2000,加拿大CAN/CSA—S16—2001,澳大利亚AS4100—1998,日本AIJ—2002和我国GB50017—2003七本钢结构设计规范中,受弯构件稳定设计的计算公式,介绍了许多学者关于这一问题的理论分析和试验研究成果,着重介绍了用有限单元法、有限差分法等数值法给出的,在多种横向荷载作用下非均匀受弯构件等效弯矩系数βb的表达式。对于线性非均匀简支受弯构件的等效弯矩系数βb,在我国钢结构设计规范中,从TJ17—74至GB50017—2003,一直沿用了由M.G.Salvadori在1956年用瑞利-里兹法得到的两端简支受弯构件的等效弯矩系数βb曲线中的下限值,此值与其他几个国家的钢结构设计规范中采用的βb的计算公式不同。在参考他人研究成果的基础上,提出了一个简明的,计算任意弯矩分布和任意支承条件的,受弯构件等效弯矩系数βb的表达式。此式连同经修改的梁的弯扭屈曲设计公式,可供下一轮修订我国钢结构设计规范时参考。

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