FRP-ECC加固钢筋混凝土梁受弯性能研究  

FLEXURAL BEHAVIOR OF RC VEAMS STRENGTHENED WITH FRP-ECC

作　　者：王勃[1,2] 张振 WANG Bo;ZHANG Zhen(School of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China;Jilin Structural and Earthquake Resistance Technology Innovation Center,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118 [2]吉林省结构与抗震科技创新中心,长春130118

出　　处：《低温建筑技术》2022年第4期99-103,共5页Low Temperature Architecture Technology

基　　金：国家重点研发计划项目(2017YFC0806100);国家自然科学基金项目(51178206);吉林省高校“十三五”科研规划项目(JJKH20170253KJ)。

摘　　要：桥梁、房屋服役时间过长,通过加固的方式可以提高建筑使用寿命。文中使用FRP-ECC复合材料对钢筋混凝土梁进行加固,通过有限元分析未加固梁和FRP的配筋率为0.94%、1.41%的加固梁,有限元分析结果与试验结果吻合较好,验证有限元模型准确性。拓展0%、1.67%、1.88%和2.51%FRP配筋率的加固效果。得到FRP-ECC加固梁的屈服荷载与极限荷载以及相应位移。FRP-ECC复合材料加固效果要明显优于仅使用ECC材料加固,FRP-ECC加固梁屈服荷载比控制梁提高18.4%~27.7%,FRP配筋率对屈服荷载影响不明显。FRP-ECC加固梁的极限抗弯承载力比控制梁提高27.4%~59.6%,FRP配筋率为1.41%、1.67%、1.88%和2.51%加固梁极限抗弯承载力比FRP配筋率为0.91%加固梁分别提高7.5%、13.3%、19.0%和25.2%。提出FRP-ECC加固梁抗弯承载力计算方法,与有限元模拟结果相差-5.0%~0.2%,可为FRP-ECC加固结构工程应用提供参考。The service time of bridges and houses can be improved by strengthening.In this paper,FRP-ECC composite materials are used to reinforce the reinforced concrete beams.Through finite element analysis of unreinforced beams and reinforced beams with FRP reinforcement ratio of 0.94%and 1.41%,the finite element analysis results are in good agreement with the experimental results,which verifies the accuracy of the finite element model.The yield load,ultimate load,and corresponding displacement of FRP-ECC strengthened beams are obtained for 0%,1.67%,1.88%,and 2.51% FRP reinforcement ratio.The reinforcement effect of FRP-ECC composite material is significantly better than that of ECC materials.The yield load of FRP-ECC reinforced beam is 18.4%~27.7% higher than that of the control beams,and the influence of FRP reinforcement ratio on yield load is not obvious.The ultimate flexural capacity of beams strengthened with FRP-ECC is 27.4%~59.6% higher than that of the control beams.The ultimate flexural capacity of beams strengthened with 1.41%,1.67%,1.88% and 2.51% FRP is 7.5%,13.3%,19.0% and 25.2% higher than that of beams strengthened with 0.91% FRP.The calculation method of flexural capacity of FRP-ECC strengthened beams is proposed,which is-5.0%~0.2% different from the finite element simulation results,providing the reference for the engineering applications of FRP-ECC strengthened structures.

关 键 词：FRP-ECC 加固 钢筋混凝土梁 FRP配筋率 

分 类 号：TU375.1[建筑科学—结构工程]