FRP-ECC复合约束混凝土圆柱反复受压力学性能  

Cyclic compression behavior of FRP-ECC confined concrete cylinder

作　　者：惠迎新[1,4] 王文炜 朱忠锋[3] HUI Yingxin;WANG Wenwei;ZHU Zhongfeng(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;School of Transportation,Southeast University,Nanjing 211189,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Ningxia Communications Construction CO.,LTD.,Yinchuan 750004,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]东南大学交通学院,南京211189 [3]深圳大学土木与交通工程学院,深圳518060 [4]宁夏交通建设股份有限公司,银川750004

出　　处：《复合材料学报》2022年第11期5586-5598,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52108230,51878156);宁夏自治区重点研发计划项目(2020 BFG02005)。

摘　　要：考虑核心柱混凝土强度等级、碳纤维增强树脂复合材料(FRP)网格层数、反复荷载形式等因素,对FRP网格与工程水泥基复合材料(ECC)复合增强混凝土圆柱进行了轴向受压试验,研究约束圆柱的承载力和变形能力。试验结果表明,约束柱的破坏形态表现为FRP柔性网格断裂;随着网格层数的增加,约束柱的极限荷载和变形性能分别提高2%~35%和77%~145%;随着核心混凝土强度等级的提高,复合约束柱的极限承载力提高幅度降低。此外,根据试验结果并结合FRP约束混凝土的应力-应变关系模型,本文针对FRP-ECC复合约束圆柱在反复荷载作用下提出了相应的强度模型和应力-应变关系包络线模型。分析结果表明,模型所得轴向应力-轴向应变及轴向应力-环向应变关系曲线均与试验值吻合良好。Considering the strength grade of core concrete,reinforcement layer of fiber-reinforced polymer(FRP)textile,the axial compressive tests of concrete cylinders strengthened with FRP textile and engineered cementitious composites(ECC)were carried out to study the bearing capacity and deformation performance of the FRP-ECC confined cylinder.The test results show that the failure mode of most strengthened cylinders is the rupture of embedded FRP flexible textile.With the increase of reinforcement FRP textile layers,the strengthened columns’ultimate bearing capacity and deformation performance are improved by 2%-35%and 77%-145%,respectively.With the increase of the strength grade of the core concrete,the increase range of the ultimate bearing capacity is gradually reduced.In addition,according to the test results and the stress-strain model of FRP confined concrete,the corresponding strength model and envelope stress-strain models of FRP-ECC confined cylinder are given.The analysis results show that the stress-strain curves predicted by these models match well with test results.

关 键 词：反复荷载 FRP网格 ECC 约束圆柱 应力-应变模型 混凝土圆柱 

分 类 号：TB528[理学—物理] TU599[理学—声学]