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 highnarrow-sectional box steel components with T-shaped longitudinal stiffeners under axial compression

作　　者：张龑华 盛平[1] 牛奔 张逸清 甄伟 邱意坤 冯鹏 班慧勇[2] ZHANG Yanhua;SHENG Ping;NIU Ben;ZHANG Yiqing;ZHEN Wei;QIU Yikun;FENG Peng;BAN Huiyong(Beijing Institute of Architectural DesignCo.,Ltd,Beijing 100045,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Sinobo Gongti(Beijing)Commercial Operation Management Co.,Ltd,Beijing 100600,China)

机构地区：[1]北京市建筑设计研究院股份有限公司,北京100045 [2]清华大学土木工程系,北京100084 [3]中赫工体(北京)商业运营管理有限公司,北京100600

出　　处：《建筑结构学报》2025年第3期50-62,共13页Journal of Building Structures

基　　金：北京市科技计划课题(Z221100005222009)。

摘　　要：为研究T形纵肋增强高窄截面箱形钢构件的轴压局部稳定性能,对不同腹板壁厚、翼缘壁厚和T形纵肋数量的9根高窄截面箱形钢构件开展轴压试验,得到构件破坏形态、荷载-位移曲线和应变变化,获取其承载力和延性变化规律。相较于无肋构件,配置T形纵肋构件承载力最大提高118%,平均提高75%。建议在计算配置纵肋构件的局部稳定承载力时,在有效截面面积中不计入纵肋截面面积,此时GB 50017—2017《钢结构设计标准》及AASHTO规范承载力公式计算值与试验值比值介于92%~114%,平均偏差3%。配置T形纵肋构件全截面强度利用率最大提高64%,平均提高48%。配置纵肋构件的抗屈曲效率最高,其次为加大翼缘壁厚,加大腹板壁厚效率最低。配置T形纵肋后构件延性可能降低,建议对高延性需求构件,先确定合理的构件轴压比限值,再选用设置纵肋或加大壁厚等方式进行加强。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 wali 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 

分 类 号：TU393.3[建筑科学—结构工程] TU245.1