不同径厚比下纤维-钢复合管混凝土柱轴压性能*
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（1南京林业大学土木工程学院，南京 210037；2 江苏省结构工程重点实验室，苏州 215011）［摘要］对8个纤维-钢复合管混凝土柱和4个对比钢管混凝土柱进行了轴压试验研究。结果表明，在纤维断裂前，由于受到外部纤维布的约束，纤维钢复合管混凝土柱的钢管局部屈曲得到了有效抑制，钢管无局部屈曲现象，且内部混凝土的横向膨胀较对比柱减小，纤维-钢复合管混凝土柱的应力-纵向应变关系曲线表现出了纤维与钢复合约束的独特效果，具有钢管屈服后的二次刚度和纤维断裂后显著的残余强度，随着钢管径厚比的不同，纤维断裂后的构件承载力表现出轻微下降、恒定、轻微上升、显著上升的不同趋势。提出了纤维钢复合管混凝土柱的轴压承载力计算模型，模型计算结果与试验结果显示出较好的一致性。［关键词］纤维复合材料（FRP）; 钢管混凝土; 约束; 轴心受压中图分类号：TU375.3 文献标识码：A 文章编号：1002-848X(2014)21-0032-04Axial compressive behavior of concrete-filled FRP-steel composite tubular columns with different diameter-thickness ratiosWei Yang1,2, Li Guofen1, Cao Xing1(1 College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; 2 Jiangsu Province Key Laboratory of Structure Engineering, Suzhou 215011, China)Abstract: Eight concrete-filled FRP-steel composite tubular columns and four control concrete-filled steel tubular columns were investigated under axial compression test. Test results show that local buckling of steel tubular is effectively suppressed and no local buckling phenomenon occurs prior to FRP rupture due to the confinement of external FRP jacket, moreover, lateral expansion of inner concrete decreases compared to that of the control column. Stress-strain curves of concrete-filled FRP-steel composite tubular columns exhibit an unique effect as a result of the hybrid of FRP and steel, which display a secondary stiffness after steel yielding and significant residual strength after FRP rupture. With different diameter-thickness ratios, the bearing capacity of concrete-filled FRP-steel composite tubular columns shows various trends, such as a slight descending, constant, slight ascending, or significant ascending. A model to predict the uxial compressive bearing capacity of concrete-filled FRP-steel composite tubular columns was presented, and the predicted values show good agreement with the test results.Keywords: fiber reinforced polymer (FRP); concrete-filled steel tube; confinement; axial compression*国家自然科学基金（51208262），江苏省结构工程重点实验室资助课题（ZD1005），江苏高校优势学科建设工程资助项目（PAPD），住房和城乡建设部科学技术项目（2011-K2-9）。作者简介：魏洋，博士，副教授，一级注册结构工程师，Email：wy78@njfu.edu.cn。参考文献［1］ABED F, ALHAMAYDEH M, ABDALLA S. Experi-mental and numerical investigations of the compressive behavior of concrete filled steel tubes (CFSTs) ［J］. Journal of Constructional Steel Research, 2013，80 (1):429-439.［2］李志东，李伟政，袁立朴，等.京沪高铁南京南站主站房结构设计研究［J］.建筑结构，2013，43(17)：21-32.［3］周健，丁生根，王洪军，等.南京禄口国际机场T2航站楼结构设计［J］.建筑结构，2012，42(5)：110-114.［4］康洪震，钱稼茹.钢管高强混凝土组合柱轴压承载力试验研究［J］.建筑结构，2011，41(6)：64-67.［5］张卫东，王振波，丁海军.小径厚比钢管再生混凝土短柱轴压性能研究［J］.建筑结构，2012，42(12)：86-89.［6］MOHAMED H M, MASMOUDI R. Flexural strength and behavior of steel and FRPreinforced concrete-filled FRP tube beams ［J］. Engineering Structures, 2010,32(11):37893800.［7］ZAGHI A E, SAIIDI M S, MIRMIRAN A. Shake table response and analysis of a concrete-filled FRP tube bridge column ［J］. Composite Structures, 2012, 94(5):1564-1574.［8］OZBAKKALOGLU T. Behavior of square and rectangular ultra high-strength concretefilled FRP tubes under axial compression ［J］.Composites Part B: Engineering, 2013,54(11):97-111.［9］YOUM K S, CHO J Y, LEE Y H, et al. Seismic performance of modular columns made of concrete filled FRP tubes ［J］. Engineering Structures,2013,57(12):37-50.［1０］武萍，于峰.FRP约束钢管混凝土柱应力-应变关系研究［J］.建筑结构，2013，43(8)：89-91.［1１］陶忠，庄金平，于清.FRP约束钢管混凝土轴压构件力学性能研究［J］．工业建筑，2005，35(9)：20-23.［1２］王庆利，顾威，赵颖华.CFRP-钢复合圆管内填混凝土轴压短柱试验研究［J］.土木工程学报，2005，38(10):44-48.［1３］MIRZA S A, LACROIX E A. Comparative strength analyses of concrete-encased steel composite columns ［J］. Journal of Structural Engineering, 2004, 130(12):1941-1953.
