（1 天津大学建筑学院， 天津 300072； 2 天津大学建筑工程学院， 天津 300072）

［摘要］对L形钢板连接式方钢管混凝土组合异形柱进行了双向压弯试验，分析了在双向压弯荷载作用下偏心距的变化对L形异形柱的竖向应变、侧向挠度、各单肢柱柱中截面的横向应变以及连接钢板的竖向应变等参数的影响。结果表明，在双向压弯荷载作用下，L形异形柱的极限承载力随着偏心距的增大而降低；连接钢板对各单肢柱的约束作用较强，保证了L形异形柱的整体性，各单肢柱可以协同变形。研究结果为后续L形钢板连接式方钢管混凝土组合异形柱其他受力性能的研究提供了参考。

［关键词］L形异形柱； 方钢管混凝土柱； 双向压弯试验； 偏心距

中图分类号：TU398文献标识码：A文章编号：1002-848X(2018)06-0082-05

Experimental study on biaxial eccentric compression stability of L-shaped special-shaped columns composed of concrete-filled square steel tube connected by steel plates

Zhou Ting1, Xu Minyang2, Chen Zhihua2, Li Yanbo2

(1 School of Architecture， Tianjin University ，Tianjin 300072，  China; 2 School of Civil Engineering， Tianjin University， Tianjin 300072， China)

Abstract:Biaxial eccentric compression experiment was conducted on L-shaped special-shaped columns composed of concrete-filled square steel tube connected by steel plates (LCFST columns). Under biaxial eccentric compression loading, the effects of eccentric distances on the vertical strain, lateral deflection, transverse strain of the middle height  cross section of the single mono column and the vertical strain of the connected steel plate of the LCFST columns were studied. The results show that the ultimate bearing capacity of LCFST columns decreases with the increase of eccentric distances under biaxial eccentric compression and bending load. The connection plate has strong constraint on the single mono columns, which ensures the integrity of the LCFST columns, and the single mono columns can cooperate to deform. The research results provide a reference for the study of mechanical performance of other LCFST columns.

Keywords:L-shaped special-shaped column; concrete-filled square steel tubular column; biaxial eccentric compression experiment; eccentric distance

*国家重点研发计划子课题（2017YFC070380204）,住建部科技项目（2017-K9-038）。

作者简介：周婷，博士，副教授，Email:zhouting1126@126.com。