各国钢结构设计规范中受弯构件稳定设计的比较  

A COMPARISON OF STABILITY DESIGN OF BENDING MEMBERS BY SPECIFICATIONS FOR DESIGN OF STEEL STRUCTURES IN VARIOUS COUNTRIES

作　　者：陈骥[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《工业建筑》2009年第6期5-12,共8页Industrial Construction

摘　　要：比较了在美国ANSI/AISC 360—2005,英国5950—1—2000,加拿大CAN/CSA—S16—2001,澳大利亚AS 4100—1998,日本AIJ—2002和我国GB 50017—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TJ 17—74至GB 50017—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。It is given the comparison of specifications for the stability design formulas in American ANSI/AISC 360--2005, British 5950--1--2000, Canadian CAN/CSA--S16--2001, Australian AS 4100-1998, Japanese AIJ--2002 and Chinese GB 50017--2003. The theoretical analyses and experimental researches are given. The equivalent moment factors of non-uniform bending beams, on various loading cases by finite element and finite difference methods are presented. From Chinese specifications of steel structures TJ 17--74 to GB 50017--2003, the equivalent moment factor βb for the simply supported beam, under linear non-uniform bending, is adopted, which is its approximate minimum value and is derived by M.G. Salvadori, taken from L. Rayteigh, W. Ritz, method at 1956. The value βb is different from that in other specifications for design of steel structures. Referring the academic researches, a closed-form expression of calculating equivalent moment factor for any moment distribution and end support conditions is presented. This expression together with the revised flexural-torsional buckling design formula of beam may be provided for next cycle revision of Chinese Code for Design of Steel Structures.

关 键 词：弯扭屈曲 等效弯矩系数 闭合解 

分 类 号：TU391[建筑科学—结构工程]