(1 沈阳大学建筑工程学院， 沈阳 110044； 2 东北大学资源与土木工程学院， 沈阳 110819)

［摘要］为研究CFRP片材加固损伤钢筋混凝土梁的抗弯性能，对5根钢筋混凝土梁进行了抗弯试验。研究了超载损伤加固梁的破坏形态，分析了加固梁的承载能力和刚度，比较了不同方法加固梁的加固效果。试验结果表明：相比未加固梁，嵌入CFRP板条直接加固梁、嵌入CFRP板条加固损伤梁、外贴CFRP板加固损伤梁、嵌贴CFRP板布联合加固损伤梁的屈服荷载分别提高了26%，11%，11%，37%，极限荷载分别提高了40%，22%，13%，64%。嵌入CFRP板条加固损伤梁比嵌入CFRP板条直接加固梁承载力降低13%。超载损伤会降低梁的承载力和刚度。三种加固方法均能提高加固梁后期刚度。嵌贴CFRP板布联合加固的效果优于单独CFRP板条嵌入或外贴加固方法，其承载力和刚度显著提高。

［关键词］抗弯性能； 试验研究； 钢筋混凝土梁； 碳纤维增强复合材料； 超载

中图分类号：TU375-1文献标识码：A文章编号：1002-848X(2019)24-0107-06

Flexural properties of overloading damaged reinforced concrete beams strengthened with CFRP laminates

Yang Jia1， Wang Lianguang2

(1 College of Architectural and Civil Engineering, Shenyang University, Shenyang 110044, China； 2 School of Resources ＆ Civil Engineering, Northeastern University, Shenyang 110819, China)

Abstract:In order to investigate the flexural performance of damaged reinforced concrete beams strengthened with CFRP laminates, the flexural experiments of five reinforced concrete beams were carried out. The failure mode, capacity and stiffness of reinforced concrete beams strengthened with CFRP laminates under overloaded damage were studied. The strengthening effects of  different methods were compared. The experimental results show that compared with un-strengthened beam, the yielding loads of reinforced concrete beam directly strengthened with near surface mounted（NSM）CFRP strips, damaged beam strengthened with NSM CFRP strips, damaged beam strengthened with externally bonded (EB) CFRP laminates, and damaged beam strengthened with both NSM CFRP strips and EB CFRP laminates are improved by 26%, 11%, 11% and 37% respectively, and the ultimate loads are improved by 40%, 22%, 13% and 64% respectively. Compared with directly strengthened beam, the capacity of damaged reinforced concrete beam strengthened with NSM CFRP strips is decreased by 13%. The capacity and stiffness of reinforced concrete beam are decreased by the overloaded damage. The post-yield stiffness of beams strengthened by the three different strengthened methods is increased. The strengthened effect of combined strengthened technique that both NSM CFRP strips and EB CFRP laminates is superior to the other two strengthened methods, and its capacity and post-yield stiffness are obviously improved.

Keywords:flexural performance; experimental research; reinforced concrete beam; carbon fiber reinforced polymer; overload

*国家自然科学基金项目（51504125），辽宁省自然科学基金(20170540303)，辽宁省自然基金指导计划(2019-ZD-0552)。

作者简介：杨佳，博士，副教授，Email:sydxyj@163.com。