薄壁冷弯型钢组合截面试件的整体稳定性与承载力研究  

Study on overall stability and bearing capacity of thin-walled cold-formed steel built-up specimens

作　　者：谭卓琼 张佳慧 盛孝耀 赵海燕 朱文婷 贾立峰 李沛 TAN Zhuoqiong;ZHANG Jiahui;SHENG Xiaoyao;ZHAO Haiyan;ZHU Wenting;JIA Lifeng;LI Pei(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Pudong New Area Construction(Group)Co.,Ltd.,Shanghai 201206,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]上海市浦东新区建设(集团)有限公司,上海201206

出　　处：《建筑结构》2024年第22期111-118,共8页Building Structure

摘　　要：将薄壁冷弯型钢试件沿轴向长度拼合,所得组合截面试件的承载力优于单肢试件。为了研究拼合效应对双肢组合截面试件整体稳定性的影响,针对已有试验中的158根双肢组合截面试件开展承载力计算与评估。承载力计算中采用如下假定:不计拼合效应,将双肢试件视为相互独立的试件;考虑拼合效应,分别采用等效截面替代和弹簧约束替代对组合截面进行简化。将承载力计算值与试验结果比较后发现,不计拼合效应的计算值变异系数较大且不可靠,等效截面替代法和弹簧约束替代法的计算精度与可靠性有赖于特定截面参数的选取,对不同类型截面的适用性不佳。因此,针对双肢组合截面试件的拼合效应,基于直接强度法提出了整体屈曲与局部屈曲强度曲线的修正公式,所得承载力计算值有较高的准确性与可靠性,适用性良好。The thin-walled cold-formed steel specimens are spliced along the axial length,and the bearing capacity of the composite section specimen is better than that of the single limb specimen.In order to study the influence of built-up effect to the overall stability of double-limb composite section specimens,the bearing capacities of 158 double-limb composite sections tested specimens were calculated and evaluated.The following assumptions were used in the calculation of bearing capacity:the double-limb specimens is regarded as two independent members without the built-up effect;the composite section is simplified by equivalent section substitution and spring constraint substitution respectively with the built-up effect.After comparing the calculated values of bearing capacity with the experimental results,it is found that the calculated values without built-up effect have a large coefficient of variation and are not reliable.The calculation accuracy and reliability of the equivalent section substitution and spring constraint substitution method depend on the selection of specific section parameters,and the applicability to different types of sections is not good.Therefore,based on the direct strength method,a modified formula for the overall buckling and local buckling strength curves was proposed for the built-up effect of the double-limb composite section specimens.The calculated bearing capacity has high accuracy and reliability,and the applicability is good.

关 键 词：拼合效应 双肢组合截面 整体稳定性 直接强度法 可靠性分析 

分 类 号：TU391[建筑科学—结构工程]