内圆外方复合钢管混凝土短柱轴压承载力试验研究.docx

文章编号: 1007 － 6069( 2011) 03 － 0040 － 07内圆外方复合钢管混凝土短柱 轴压承载力试验研究 扬1 ，钱稼茹1 ，纪晓东1 ，曹万林2张( 1． 清华大学 土木工程系 结构安全与耐久教育部重点试验室，北京 100084; 2． 北京工业大学 建筑工程学院，北京 100124)摘 要: 为研究内圆外方复合钢管混凝土柱的轴压承载力，完成了 10 个试件的轴心受压试验。试验结果表明: 达到峰值承载力时，方钢管纵向已屈服、横向尚未屈服; 试件的破坏形态为方钢管向外鼓 曲、沿纵向局部撕裂，方钢管与圆钢管之间的混凝土已经酥松、局部压碎; 大部分试件即使纵向平均 压应变达到 0． 11，尚能承担不小于其峰值承载力 70% 的 轴 力; 压缩刚度的计 算值平均为实测值的 83． 6% 。采用钢管仅提供轴压承载力、不提供横向约束的假定计算得到的试件的轴压承载力，与试 验结果符合最好。关键词: 内圆外方复合钢管混凝土短柱; 轴心受压试验; 约束; 轴压承载力中图分类号: TU528． 59; TU317． 1文献标志码: AExperimental study on axial compressive strength ofconcrete filled composite steel tube short columnsZHANG Yang1 ，QIAN Jiaru1 ，JI Xiaodong1 ，CAO Wanlin2( 1． Department of Civil Engineering，Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry，TsinghuaUniversity，Beijing 100084，China; 2． College of Architecture and Civil Engineering，Beijing University of Technology，Beijing 100124，China)Abstract: To study the axial compressive strength of the concrete filled composite steel tube short column which isthe concrete filled square steel tube reinforced with a central circular steel tube，10 specimens were tested under the axial compressive loading． Test results indicated that at the peak axial load the square steel tube had yielded in the vertical direction and did not yield in the lateral direction; the specimens failed in local buckling and tearing of square steel tube，crushing of concrete between the square steel tube and the circular steel tube． For most of the specimens even the longitudinal average strain reached 0． 11，the residual strength remained more than 70% of the peak compressive strength． The calculated compressive stiffness was approximately 83． 6% of the measured valueson the average． Assuming that the steel tubes do not contribute lateral confinement to the concrete，but providescompressive strength only，the predicted compressive strengths of the specimens has good agreement with the test results．Key words: concrete filled composite steel tube short colum