FRP缠绕方式对FRP约束钢管混凝土短柱轴压性能的影响研究  

Axial compressive behavior of FRP confined concrete-filled steel tubular columns with different FRP-sheet winding patterns

作　　者：王罡[1] 胡清[2] 刘昌永[2,3] 王玉银[2,3] 吴皓凡 WANG Gang;HU Qing;LIU Changyong;WANG Yuyin;WU Haofan(MCC Construction Research Institute Co.,Ltd,Beijing 100089,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100089 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2021年第S02期189-196,共8页Journal of Building Structures

基　　金：国家工业建筑诊断与改造工程技术研究中心开放基金(YZA2018Ky05);天津市科技计划(18ZXGDGX00030)

摘　　要：为研究纤维增强复合材料(FRP)的缠绕方式对FRP约束钢管混凝土短柱轴压性能的影响,完成了10个FRP约束钢管混凝土短柱和2个钢管混凝土短柱的轴压试验,变化参数包括FRP布缠绕方式(通长环向缠绕、螺旋缠绕和套袋缠绕)和粘贴FRP布层数(2、4层和6层)。结果表明:FRP布以较小角度螺旋缠绕时,FRP对钢管混凝土的约束效果与环向缠绕时相近,而套袋缠绕时由于纤维丝与柱横截面的夹角过大,FRP约束效果并不明显,FRP约束钢管混凝土短柱的轴压承载力与钢管混凝土柱的相近;FRP约束钢管混凝土短柱的轴压承载力随FRP布层数的增加近似呈线性增长。此外,建立了FRP约束钢管混凝土柱的有限元模型并采用试验结果对模型进行验证,基此分析了纤维缠绕角度对轴压承载力的影响,提出了考虑纤维缠绕角度的FRP约束钢管混凝土轴压柱承载力简化计算方法。Axial compression tests on ten fiber reinforced polymer(FRP)confined concrete-filled steel tubular(CCFT)columns and two concrete-filled steel tubular(CFST)columns were conducted to investigate the influence of FRP winding patterns(circumferential winding,spiral winding and braided FRP shell)and FRP thickness(2,4 and 6 layers of FRP sheets).The test results show that with a small winding angle,the FRP confining effect of spirally wound CCFT columns on the core concrete comes similar with that of circumferentially wound specimens,while no obvious confinement is provided by braided FRP shell due to the large angle between column cross-section and fibers,and the bearing capacity of specimens is similar to that of CFST columns.Besides,the bearing capacity of CCFT columns increases approximately linearly with the addition of FRP layers.Furthermore,the influence of the FRP winding angle on the capacity of CCFT columns was analyzed by finite element models that were validated by tests.Based on the analysis results,the calculation equation of the axial bearing capacity of CCFT columns was proposed,which took into account the effect of FRP winding angle.

关 键 词：约束钢管混凝土柱 纤维增强复合材料(FRP) 缠绕方式 静力试验 有限元分析 轴压性能 

分 类 号：TU398.9[建筑科学—结构工程]