铝合金受压板件局部屈曲承载力设计方法  

Design methods for local buckling bearing capacity of aluminum alloy members under compression

作　　者：袁霖 张其林[1] YUAN Lin;ZHANG Qilin(College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院

出　　处：《计算机辅助工程》2019年第4期50-58,共9页Computer Aided Engineering

基　　金：国家自然科学基金(51738009)

摘　　要：为考察现有铝合金设计规范预测非焊接受压板件承载力的准确性,采用壳单元建立单向受压四边简支板、方形截面管柱和十字形截面轴压柱有限元模型,使用ANSYS计算得到铝合金板件弹塑性屈曲临界应力和极限承载力。数值计算结果与理论分析结果对比发现:现有板件弹塑性屈曲应力理论能够给出铝合金板件屈曲临界应力的下限值,误差较小。中国规范非加劲板件有效厚度预测公式偏保守,因此给出修正的有效厚度预测公式。修正后的非加劲板件有效厚度公式可以提高板件利用率,增强经济性。To study the accuracy of existing aluminum alloy design standard for predicting the ultimate bearing capacity of non-welded plates under compression,the finite element model of simply supported plate,square-section column and cruciform-section column under axial compression is built using shell elements.The elastic-plastic buckling stress and ultimate bearing capacity of aluminum alloy members are obtained using ANSYS.The comparisons between numerical calculation results and theoretical analysis results show that the existing elastic-plastic buckling stress theories can lead the lower limits of critical buckling stress of aluminum alloy members with small error.The effective thickness predicting formulas of non-stiffened members in Chinese standard are conservative.The improved effective thickness prediction formulas are proposed.The utilization efficiency can be improved by using the suggested formulas on effective thickness of non-stiffened members,which is more economic.

关 键 词：铝合金 板件 承载力 有效厚度 塑性 屈曲 局部稳定 

分 类 号：TU512.4[建筑科学—建筑技术科学] TB115.1[理学—数学]