（西南科技大学土木工程与建筑学院， 绵阳 621010）

［摘要］进行了4组共36个冷弯薄壁方钢管长柱的轴心压力试验，考虑了长细比、不同填充材料两个变化参数，得到了试件的破坏模式及承载力等。结果表明，试验中空钢管柱发生失稳破坏，由于宽厚比较大，局部失稳发生后迅速导致整体失稳，而填充材料后的试件，局部失稳后承载力降低缓慢，依然可继续承载；空钢管侧向位移值不易满足《低层冷弯薄壁型钢房屋建筑技术规程》（JGJ 227—2011）规定限值，尤其是当长细比达到172-9时，侧向位移值更难得到保证，而填充轻质耐压材料后可有效限制其侧向位移发展，构成柱的第二道抗破坏防线。填充材料后的柱，其稳定承载力明显提高；柱长细比越大，承载力提高越明显。

［关键词］冷弯薄壁方钢管木组合长柱； 试验研究； 极限承载力； 破坏模式

中图分类号：TU398+.6文献标识码：A文章编号：1002-848X(2017)04-0075-06

Experimental study on axial compression behavior of cold-formed thin-walled square steel tube-timber composite long columns

Chu Yunpeng, Yao Yong, Yang Dongsheng, Zhang Chuntao

(College of Civil Engineering, Southwest University of Technology, Mianyang 621010, China)

Abstract:Experimental study on 4 groups of 36 specimens of axial compression behavior of cold-formed thin-walled square steel tube long columns was conducted considering two parameters of slenderness ratio and different filling materials, to obtain specimen failure mode and bearing capacity. Results show that the hollow steel tube columns suffer from unstable failure and overall instability rapidly occurs after local buckling due to the large width-thickness ratio. Bearing capacity of specimens with filling materials decreases slowly after local buckling, so the specimens can still undertake loadings. Lateral displacement value of hollow steel tube hardly meets requirements of limited value in Technical specification for low rise cold-formed thin-walled steel building (JGJ 227—2011) and lateral displacement value is more difficult to meet, especially slenderness ratio reaches 172-9. While steel  tube filling the light pressure-resistant material can effectively limit the development of its lateral displacement to constitute the second lines of defense against damage of the column. The stability bearing capacity of the column is obviously improved after filling material, and the bigger the slenderness ratio is, the more obvious the bearing capacity is improved.

Keywords:cold-formed thin-walled square steel tube\|timber composite long column; experimental study; ultimate bearing capacity; failure mode

*国家自然科学基金项目(51508482)，四川省科技支撑计划项目（2016GZ0318）。

作者简介：褚云朋，博士研究生，副教授，Email:chuyunpeng@swust.edu.cn。