蜂窝梁畸变屈曲性能研究

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中图分类号：TU391 文献标志码：A 文章编号：1000-582X（2026）01-082-12

Research on distortional buckling performance of castellated beams

LI Jingchao'，ZHOU Xuhong²，HE Ziqi² （1.School of Civil Engineering，Hunan City University， Yiyang，Hunan 410o8，P.R.China; 2.Schoolof Civil Engineering， Chongqing University， Chongqing 40oo45，P.R. China）

Abstract：To investigate the distortional buckling performance of castellted beams，six castellated beam specimens were subjected to static load at the mid-span.The corresponding failure modes，load-vertical displacement responses，and web deformed shape curves of specimens were obtained.The results indicate that all six specimens failed in a distortional buckling mode.Specifically，the compresive flange of the entire specimens exhibited an S-shaped curve upon failure.Meanwhile，out-of-plane bulging deformation occurred in the web post sectionatthe mid-span loading location.Withthe increase ofcastelated beam length，both the initial stiffnessof the load-vertical displacement curve and the critical distortional buckling capacity reduced.Results of the distortional buckling strengths obtained from theexperiments were further compared withthe predications calculated using the modified method suggested by AS41oo，AISC，and Nethercot and Trahair. The comparison results show that the predications of the AS410o method and the Nethercot and Trahair approach are in goodagreementwith the test results.

Keywords： castellated beams; local buckling; distortional buckling; critical load

蜂窝梁一般采用切割与错位焊接技术进行加工，相较于传统的实腹梁，其平面刚度得到显著改善。（剩余10521字）