FRP约束钢管混凝土柱应力-应变关系研究*
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武萍，于峰（安徽工业大学建筑工程学院， 马鞍山 243002）［摘要］确定FRP约束钢管混凝土柱的应力-应变关系是研究其力学性能的关键。根据弹性理论，引入等效约束效应系数，分别提出FRP约束钢管混凝柱的承载力和峰值应变的计算公式。在此基础上，建立了FRP约束钢管混凝土柱的应力-应变关系模型，该模型可分为三个阶段：弹性阶段、强化段和下降段。该模型较好地反映了FRP约束钢管混凝土柱应力-应变关系的特点，考虑了各因素对FRP约束钢管混凝土柱力学性能的影响。模型的计算值与试验结果吻合较好。［关键词］FRP；钢管混凝土；应力-应变关系；承载力中图分类号：TU375, TU528 文献标识码：A 文章编号：1002-848X(2013)08-0089-03Study on stress-strain relationship of concrete filled steel tubes confined with FRPWu Ping, Yu Feng（School of Civil Engineering, Anhui University of Technology, Ma′anshan 243002, China)Abstract: The determination of stress-strain relationship of concrete filled steel tubes confined with FRP is the key to study the mechanical behavior of confined concrete. According to the elastic theory,the equivalent confinement effect coefficient was introduced,the calculating formulae of the bearing capacity and the peak strain of concrete filled steel tubes confined with FRP were proposed.Then the stress-strain relationship model of concrete filled steel tubes confined with FRP was established,the model may be divided into three portions:the elastic stage,the strengthening stage and the descending stage.The model reflects the main characteristics of stress-strain relationship of concrete filled steel tubes confined with FRP,the effect of each factor on the mechanical behavior is well considered.The predictions of the model agree well with test data.Keywords: fiber reinforced polymer; concrete filled steel tube; stress-strain relationship; bearing capacity*国家自然科学基金（51008001），安徽省自然科学基金（1208085QE88），住房和城乡建设部科学技术项目（2012-K2-7)。通讯作者：于峰，博士，教授，Email:yufeng2007@126.com。参考文献［1］韩林海，陶忠，王文达，等. 现代组合结构与混合结构：试验、理论和方法［M］. 北京：科学出版社，2009.［2］丁发兴，应小勇，余志武，等. 圆钢管轻骨料混凝土轴压短柱的力学性能分析［J］. 深圳大学学报，2011，28（3）：207-212.［3］WEI YOUYI, WU YUFEI. Unified stress-strain model of concrete for FRP-confined columns［J］. Construction and Building Materials, 2012, 26(1): 381-392.［4］于峰，牛荻涛.轴心受压FRP约束混凝土圆柱应力-应变模型［J］.哈尔滨工业大学学报，2009，41（10）：214-216.［5］MOHAMED H H.Axial stress-strain relationship for FRP confined circular and rectangular concrete columns［J］.Cement and Concrete Composites,2006,28(10):938-948.［6］KAZUNORI FUJIKAKE, SIDNEY MINDESS, XU HANFENG. Analytical model for concrete confined with fiber reinforced polymer composite［J］. Journal of Composites for Construction, 2004, 8(4): 341-351.［7］MARWAN N YOUSSEF, MARIA Q FENG, AYMAN S MOSALLAM. Stress-strain model for concrete confined by FRP composites［J］. Composites: Part B Engineering, 2007, 38(56): 614-628.［8］于峰. PVC-FRP管混凝土柱力学性能的试验研究与理论分析［D］. 西安：西安建筑科技大学，2007.［9］于峰，牛荻涛，贺拴海. 纤维复合材料约束混凝土柱统一强度模型［J］. 长安大学学报，2010，30（2）：70-74.［10］YU FENG,NIU DITAO.Unified bearing capacity model of confined concrete column subjected to axial compression［J］. Journal of Harbin Institute of Technology, 2009, 16(5): 99-104.［11］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.［12］陶忠，于清. 新型组合结构柱——试验、理论与方法［M］.北京：科学出版社，2006.［13］蔡绍怀. 现代钢管混凝土结构［M］. 北京：人民交通出版社，2003.
