HB-FRP加固钢筋混凝土梁抗弯试验及数值模拟  

Experimental and numerical simulations of HB-FRP flexural reinforced beam

作　　者：李岩 魏琦安 石南 高磊[4] 王佳斌 黄悦 LI Yan;WEI Qi'an;SHI Nan;GAO Lei;WANG Jiabin;HUANG Yue(Shandong Hi-speed Construction Mangement Group Co.,Ltd.,Jinan 250014,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Shandong Hi-Speed Yanpeng Highway Co.,Ltd.,Weihai 265800,China;Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China)

机构地区：[1]山东高速建设管集团有限公司,济南250014 [2]青岛理工大学土木工程学院,青岛266033 [3]山东高速烟蓬公路有限公司,威海265800 [4]山东大学岩土与结构工程研究中心,济南250061

出　　处：《复合材料科学与工程》2024年第7期74-85,共12页Composites Science and Engineering

基　　金：山东省自然科学基金青年项目(ZR2021QE216)。

摘　　要：为研究混合粘贴FRP(HB-FRP)加固混凝土(RC)梁的抗弯性能,对八片HB-FRP加固梁进行三点弯曲试验,研究了螺栓扭矩、扣件间距、锚固分布模式以及FRP板黏结方式对试件的破坏模式、荷载-挠度曲线以及FRP应变分布的影响规律。基于有限元软件ABAQUS建立HB-FRP加固RC梁的精细有限元模型,通过试验结果验证模型并开展参数分析。结果表明:与未加固梁相比,HB-FRP加固梁的极限荷载提高了71%~156%,极限荷载和FRP利用率随螺栓扭矩的增加而提高,随着扣件间距的增加而降低;通过消除扣件与FRP板之间的黏结,试件均发生了FRP板剥离破坏;跨中集中和端部集中锚固的加固效果不稳定,易提前发生破坏;建立的HB-FRP加固RC梁计算模型精度良好,可用于抗弯性能的模拟计算;扣件宽度和碳板宽度的增加提高了HB-FRP加固梁的极限荷载;螺栓扭矩和扣件宽度过高会导致受压区混凝土提前破坏;FRP的利用率随着FRP宽度增加而减小。In order to study the flexural performance of concrete(RC)beams reinforced with hybrid bond FRP(HB-FRP),three-point bending tests were conducted on eight HB-FRP reinforced beams to investigate the effects of bolt torque,fastener spacing,anchorage distribution pattern and FRP plate bonding method on the damage pattern,load-deflection curve and FRP strain distribution of the specimens.Based on the finite element software ABAQUS,a finite element model of HB-FRP strengthened RC beams was established,and the model was verified by test results and parametric analysis was carried out.The results show that the ultimate load of HB-FRP strengthened beams is increased by 71%~156%compared with unreinforced beams,and the ultimate load and FRP utilization rate increase with the increase of bolt torque and decrease with the increase of fastener spacing;FRP plate peeling damage occurs in all specimens by eliminating the bond between fasteners and FRP plates;the reinforcement effect of span-centered and end-centered anchorage is unstable and prone to early damage occurred;the established calculation model of HB-FRP reinforced RC beams has good accuracy and can be used for the simulation of flexural performance;the increase of fastener width and carbon plate width increased the ultimate load of HB-FRP reinforced beams;the high bolt torque and fastener width will lead to premature concrete damage in the compression zone;the utilization rate of FRP decreases with the increase of FRP width.

关 键 词：加固 纤维增强塑料 抗弯 有限元 锚固参数 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]