摘要
为研究钢纤维对碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)与再生混凝土界面粘结性能的影响,设计了6组共18个CFRP加固切口梁试件进行界面粘结性能试验,分析再生粗骨料和钢纤维掺量对试件破坏形态、极限承载力、应力水平和界面滑移过程的影响规律,揭示了CFRP与钢纤维再生混凝土的界面粘结机理。结果表明:50%取代率的再生混凝土界面破坏形态与普通混凝土差异不大,均为混凝土的内聚破坏;CFRP和再生混凝土试件的极限荷载与普通混凝土相比降低了14.85%,当钢纤维掺量为0.4%~1.0%时,CFRP与钢纤维再生混凝土试件的极限承载力平均提高了40%以上;粘结-滑移曲线的峰值位移s0、峰值剪应力τm和界面断裂能Gf随着钢纤维掺量的增加而增大。基于Popovics模型和陆新征简化模型建立了特征参数s0、τm和Gf与抗拉强度ft的关系表达式。
In order to study the influence of steel fiber on the interface bond performance between carbon fiber reinforced polymer(CFRP)and recycled concrete,6 groups of 18 CFRP reinforced notched beam specimens were designed for interfacial bond performance test.The influence rules of recycled coarse aggregate and steel fiber content on damage pattern,ultimate load capacity,stress level,and interface slip process of specimens were analyzed and the interfacial bond mechanism between CFRP and steel fiber recycled concrete was revealed.The results show that the interfacial failure pattern of 50%replacement rate of recycled concrete is not much different from that of normal concrete,both are cohesive failures of concrete.Compared with normal concrete,the ultimate load of CFRP and recycled concrete specimens reduces by 14.85%.When the steel fiber content is 0.4%~1.0%,the ultimate load capacity of CFRP and steel fiber recycled concrete specimens increases by more than 40%on average.The peak displacement s0,peak shear stressτm and interfacial fracture energy Gf of the bond⁃slip curves increase with the increase of steel fiber content.Based on the Popovics model and Lu Xinzheng simplified model,the expressions for the relationships between the characteristic parameters,s0,τm and Gf with tensile strength ft are developed.
作者
夏冬桃
何国章
李彪
颜帅
徐乐
XIA Dongtao;HE Guozhang;LI Biao;YAN Shuai;XU Le(School of Civil,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China)
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2023年第7期817-825,共9页
Engineering Journal of Wuhan University
基金
国家自然科学基金青年科学基金项目(编号:51108164)。
关键词
钢纤维再生混凝土
碳纤维增强复合材料
界面性能
粘结机理
粘结-滑移曲线
steel fiber recycled concrete
carbon fiber reinforced polymer(CFRP)
interface performance
bond mechanism
bond⁃slip curve
