(同济大学建筑工程系  上海 200092)
【提要】  根据板件屈曲微分方程的Levy解，建立了受压箱形截面及槽形截面的弹性相关屈曲理论，给出了相邻板件约束系数的计算式。在现行欧洲铝合金结构设计规范Eurocode 9关于加劲板件及非加劲板件有效截面计算的基础上，通过引入约束系数考虑了相临板件间约束作用对截面承载力的影响，从而进一步完善了铝合金受压板件的局部稳定设计理论。应用非线性有限元软件计算了均匀受压箱形截面及槽形截面铝合金短柱的极限承载力，并与建议方法作了比较。分析表明，受压板件发生局部屈曲时确实存在板组效应，且采用文中提出的计算方法得出的结果在大多数情况下是偏于安全的。
【关键词】  铝合金  相关屈曲  有效宽度  有效厚度  板组效应
Effective Section Calculation Approach of Aluminium Plate Element Considering Interactive Local Buckling Under Axial Load/Wu Yage, Zhang Qilin(College of Civil Engineering, Tongji University,Shanghai 00092,China)
Abstract:Elastic interactive local buckling theories of box section and channel section are established according to classical Levy solution to differential equation of plate stability.Formulations calculating restraining coefficient are derived.Based on the effective thickness method adopted by update Eurocode 9 treating stiffened element and unstiffened element,the restraining coefficient is then introduced to account for the restraining action exerted by adjacent plate element and its effect on the bearing capacity of cross section.Finally,nonlinear finite element analysis is employed to predict the ultimate strengths of box section and channel section under uniform compression,and the results are compared with the approximate approach developed.It is found that the plateassembly effect does exist when local buckling takes place, and the results given by the approach are inclined to be safe in most cases.
Keywords:aluminium; interactive buckling; effective width; effective thickness; plateassembly effect
*建设部铝合金结构设计规范项目资助。