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FRP黏结长度对混凝土三点弯曲梁断裂参数的影响
Influence of FRP Bonding Length on Fracture Parameters of Concrete Three Point Bending Beam
投稿时间:2018-04-23  修订日期:2018-06-08
DOI:103969/j.issn.1007 9629201901006
中文关键词:  纤维增强复合材料  FRP加固混凝土  黏结长度  断裂  声发射
英文关键词:fiber reforcement plastic(FRP)  FRP reinforced concrete  bonding length  fracture  AE
基金项目:“十三五”国家重点研发计划(2016YFC0401907);国家自然科学基金资助项目(51679150,51579153,51739008,51879168);国家重大科研仪器研制项目(51527811);江苏省优秀青年科学基金项目(BK20180051);南京水利科学研究院基金项目(Y417002,Y417015)。
              
作者单位
范向前
FAN Xiangqian
南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210098
State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210098, China
刘决丁
LIU Jueding
南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210098
State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210098, China
胡少伟
HU Shaowei
南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210098
State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210098, China
陆俊
LU Jun
南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210098
State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210098, China
乔艳敏
QIAO Yanmin
南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210098
State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210098, China
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中文摘要:
      为探讨纤维增强复合材料(FRP)加固带裂缝混凝土结构的最优性价比,采用损伤断裂试验,研究了FRP黏结长度对混凝土三点弯曲梁试件断裂参数的影响.通过在混凝土三点弯曲梁试件表面粘贴应变片,测试了FRP加固混凝土开裂破坏起裂荷载;利用夹式引伸计测得荷载裂缝口张开位移曲线,根据改进的断裂韧度计算公式,计算出FRP黏结长度不同的混凝土三点弯曲梁试件的有效裂缝长度ac,失稳韧度Kun′IC和起裂韧度Kini′IC.结果表明:对于相同初始裂缝深度的混凝土三点弯曲梁试件,FRP加固混凝土的峰值荷载随着FRP黏结长度的增加而增大,Kun′IC和Kini′IC均随着FRP黏结长度的增加先增大再减小,当FRP黏结长度为25mm时,FRP加固混凝土三点弯曲梁试件Kun′IC和Kini′IC的平均值均达到最大,阻裂效果最佳;采用声发射(AE)无损检测技术,对上述混凝土断裂过程中的声发射参量进行识别和采集,发现对于初始缝高比为04的FRP加固混凝土三点弯曲梁试件而言,其FRP最佳黏结长度为25mm.
英文摘要:
      In order to discuss the best performance price ratio of fiber reforcement plastic(FRP) concrete with cracked concrete structure, the effect of FRP bonding length on the fracture parameters of three point bending beam of concrete was studied through the damage and fracture test of different length fiber cloth adhered to the three point bending beam of concrete. The crack initiation load of FRP reinforced concrete cracking test was tested by placing a strain gauge on the surface of a three point bending concrete specimen with cracks and the displacement curve of the load crack opening was measured by a clamp extensometer. According to the improved calculation formula of fracture toughness, the effective crack length ac, instability toughness Kun′IC and crack toughness Kini′IC of three point bending beam specimens with different FRP adhered length were calculated. The test results show that the peak load of FRP reinforced concrete increases with the increase of FRP adhered length for the concrete three point bending beam with the same initial crack depth, the instability toughness and the crack toughness of the concrete increase first and then decrease with the increase of the bonding length of the FRP. When the length of the FRP adhesion is 25mm, the average value of FRP instability fracture toughness and initiation fracture toughness reach the maximum, crack resistance effect is the best. Based on acoustic emission(AE) non destructive testing technology, the acoustic emission parameters of the above mentioned concrete during fracture process are identified and collected.The optimum bonding length of FRP for concrete three point bending beams strengthened with 04 initial crack depth ratio is 25mm.
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