考虑板件相关作用的冷弯矩形截面轴压短柱承载力  

Ultimate compressive bearing capacity of cold-formed stub columns with rectangular hollow sections considering plate interactive effect

作　　者：史晓鹏 程欣[1] 王夏欣 SHI Xiaopeng;CHENG Xin;WANG Xiaxin(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院,太原030024

出　　处：《中国科技论文》2022年第10期1084-1092,共9页China Sciencepaper

基　　金：国家自然科学基金资助项目(51978437)。

摘　　要：为探究不同翼缘和腹板宽厚比组配的冷弯矩形截面的极限抗压承载力,采用ABAQUS建立了考虑初始几何缺陷、几何和材料非线性以及冷弯效应等因素影响的冷弯矩形截面钢管有限元模型,并通过试验校核验证了模型的准确性。基于该模型完成了不同翼缘和腹板宽厚比在轴压作用下的参数分析,得到了翼缘和腹板宽厚比对极限承载力的影响规律,并总结出3种破坏模态,辅以截面应力发展过程阐述了破坏机理。通过提取不同翼缘和腹板宽厚比构件极限状态时屈曲变形最大截面的应力分布情况,展现了板件相关作用的影响。最后基于有效宽度法提出了考虑板件相关作用的极限承载力建议公式,并将建议公式与现行规范和参数分析结果进行对比,证明了建议公式的准确性与适用性。In order to investigate the ultimate compressive bearing capacity of cold-formed rectangular hollow sections with different width-thickness ratios of flange and web,a finite element model was established by ABAQUS considering the effects of initial geometric defects,geometric and material nonlinearity and cold-formed effect.The accuracy of the model was verified by existing experimental results.Based on the finite element model,the parametric analysis with different width-thickness ratios of flange and web under axial compression was conducted.The influence of width-thickness ratios of flange and web on ultimate bearing capacity was obtained,and three failure modes were summarized and analyzed by cross-sectional stress development.The plate interactive effect of components with different width-thickness ratios of flange and web was discussed by extracting the stress distribution of the cross-section with maximum buckling deformation at the ultimate state.The formula calculating ultimate compressive bearing capatity was proposed based on the effective width method and considering plate interactive effect.Finally,compared with the current specification and parameter analysis results,the proposed formula was proved to be accurate and applicable.

关 键 词：冷弯矩形截面 板件相关作用 极限承载力 有效宽度法 局部屈曲 

分 类 号：TU391[建筑科学—结构工程]