建筑结构学报2025，Vol.46Issue(3)：50-62,13.DOI:10.14006/j.jzjgxb.2024.0314
T形纵肋增强高窄截面箱形钢构件轴压局部稳定性能试验研究
Experimental study on local stability performance of high-narrow-sectional box steel components with T-shaped longitudinal stiffeners under axial compression
摘要
Abstract
To study the local stability performance of high-narrow-sectional box steel components with T-shaped longitudinal stiffeners under axial compression,axial compression tests on nine high-narrow-sectional box steel components with different web thicknesses,flange thicknesses,and numbers of T-shaped longitudinal stiffeners were conducted to obtain the failure modes,load,deformation,and strain changes,and then the load bearing capacity and ductility of the components were analyzed.To compare with components without stiffeners,the maximum increase in the ultimate bearing capacity of the components with T-shaped longitudinal stiffeners is 118％,with an average increase of 75％.It is suggested that when calculating the local stability bearing capacity of longitudinal rib components,the effective cross-sectional area should not be included in the longitudinal rib cross-sectional area.As a consequence,the ratio of the calculated bearing capacity according to GB 50017-2017'Standard for design of steel structures'and AASHTO and the experimental value is between 92％and 114％,with an average deviation of 3％.The maximum increase in the strength utilization rate of the entire cross-section of components with T-shaped longitudinal stiffeners is 64％,with an average increase of 48％.The highest anti-buckling efficiency was achieved by using longitudinal stiffeners,followed by increasing the flange wall thickness,and increasing the web wall thickness had the lowest efficiency.After configuring T-shaped longitudinal stiffeners,the ductility of the component may decrease.It is thus recommended that for components with high ductility requirements,a reasonable limit value for the axial compression ratio should be determined first,before adopting the appropriate strengthening methods such as configuring longitudinal stiffeners or increasing the wall thickness.关键词
高窄截面箱形钢构件/T形加劲肋/轴压试验/局部稳定/承载力/延性Key words
high-narrow-sectional box steel component/T-shaped stiffener/axial compression experiment/local stability/load bearing capacity/ductility分类
土木建筑引用本文复制引用
张龑华,盛平,牛奔,张逸清,甄伟,邱意坤,冯鹏,班慧勇..T形纵肋增强高窄截面箱形钢构件轴压局部稳定性能试验研究[J].建筑结构学报,2025,46(3):50-62,13.基金项目
北京市科技计划课题(Z221100005222009). （Z221100005222009）
