板的局部屈曲及屈曲后极限承载力分析

板的局部屈曲受截面类型控制,Eurocode规范根据板的局部屈曲的情况划分了四种截面,其中截面类型I^III的承载能力由于构件整体失稳而降低,类型IV截面承载能力因板的局部屈曲而削弱。针对类型IV截面,板的屈曲临界荷载及最大极限荷载进行了算例计算。研究表明:①受压板首先发生局部屈曲,在屈曲区域退出工作后,外部框架继续承载直至材料屈服;②屈曲后最大极限荷载较屈曲临界荷载提高约36%;③考虑加劲肋的板的极限承载力较无加劲肋的板有较大程度的提高。

Analysis of Local Buckling and Post Buckling Ultimate Bearing Capacity of Plate

The local buckling of the plate is controlled by the type of section.The Eurocode proposes four sections according to the local buckling of the plate,of which the bearing capacity of the type I^III is reduced because of the global buckling,and the bearing capacity of type IV section is weakened by the local buckling of the plate.The buckling critical load and the maximum ultimate load of the type IV section plate are calculated.The research shows that:①the local buckling of the compression plate is first occurred,and the external frame continues to bear until the material yield after the buckling region exit;②the maximum ultimate load after buckling is about 36%higher than that of the critical buckling load;③the ultimate bearing capacity of plates considering stiffeners is greatly improved compared with those without stiffeners.