冷弯薄壁方钢管长柱轴压与偏压性能研究*
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（西南科技大学土木工程与建筑学院， 绵阳 621010）［摘要］进行了9组共18个冷弯薄壁方钢管受压长柱试件的试验研究，考虑了长细比、偏心距两个变化参数，得到了试件的破坏形态、荷载-位移曲线以及承载力等重要数据，并采用有限元方法进行了数值模拟计算。结果表明：1）对于轴心受压柱，在长细比λ≤36.4时，柱发生强度破坏，承载力较高；对于受压偏心距较大的柱，发生屈曲破坏，且发生局部屈曲后在持荷下迅速丧失承载能力。2）偏心距对受压构件极限承载力影响很大，在长细比λ≥29.1时，极限承载力随偏心距增加而迅速降低；建议在长细比λ≥58.2时，受压柱需加支撑以减小计算长度，提高极限承载力。3）有限元计算结果与试验结果较为接近，差值在12%以内，具有一定准确度。［关键词］冷弯薄壁方钢管柱; 试验研究; 有限元分析; 屈曲性能中图分类号：TU392.1 文献标识码：A 文章编号：1002-848X(2013)21-0018-05Research on behavior of cold-formed thin-walled long square steel tube columns under concentrically and eccentrically compressive loadsChu Yunpeng, Yao Yong, Deng Yongjun, Xiao Shulian(College of Civil Engineering, Southwest University of Technology, Mianyang 621010, China)Abstract: Tests of 18 specimens (9 groups) of cold-formed thin-walled square steel tube long columns under compressive loads were carried out. Slenderness ratio and the eccentricity of the specimens were considered and the data of failure mode, load-displacement curve as well as the bearing capacity of every specimen were obtained. Numerical simulation was carried out using finite element analysis method. Results show that: 1）columns under concentrically compressive loads with the slenderness ratio less than 36.4 occur strength failure with high bearing capacity; for specimens under eccentrically compressive loads, their carrying capacity decrease dramatically when columns occur buckling or local buckling failure. 2）Eccentricity has great influence on ultimate bearing capacity of compression members and their ultimate bearing capacity sharply reduce in reverse proportion to eccentricity when slenderness ratio is greater than 29.1. Braces between compression members are needed to add to reduce the calculated length and improve the ultimate bearing capacity when the slenderness ratio is greater than 58.2.3）The finite element simulation results are in good agreement with experimental results with difference less than 12%.Keywords: cold-formed thin-walled square steel tube column; experimental study; finite element analysis; buckling behavior*国家高技术研究发展支撑计划(863计划)项目(2009AA032304)，四川省科技支撑计划项目（2011GZ0043），四川省教育厅基础研究项目（12ZB157）。作者简介：褚云朋，博士研究生，讲师，Email：chuyunpeng@swust.edu.cn。参考文献［1］周绪红，石宇，周天华，等. 低层冷弯薄壁型钢结构住宅体系［J］.建筑科学与工程学报，2005，22(2)：1-14.［2］姚勇，褚云朋，邓勇军，等.低层冷弯薄壁型钢结构体系动静性能数值模拟［J］.建筑结构，2011，41(2)：41-45.［3］石宇，周绪红，苑小丽，等. 冷弯薄壁卷边槽钢轴心受压构件承载力计算的折减强度法［J］. 建筑结构学报，2010，31(9)：78-86.［4］罗洪光，郭耀杰，刘华琛. 冷弯薄壁轴压柱畸变屈曲直接强度法和有效面积法对比分析［J］.建筑结构，2011，41(2)：51-60.
