端部嵌贴预应力CFRP加固RC梁的弯曲性能研究  

Flexural behavior of reinforced concrete beams strengthened with near end enhanced embedded prestressed CFRP strips

作　　者：肖运鑫 彭晖 XIAO Yunxin;PENG Hui(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Bridge Engineering Safety Control,Ministry of Education,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]长沙理工大学桥梁工程安全控制教育部重点实验室,湖南长沙410114

出　　处：《交通科学与工程》2024年第5期29-36,共8页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(52178186)。

摘　　要：为考察端部嵌贴(near-end enhanced embedded,NEEE)预应力碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)新型加固系统的效能,研究了不同加固方法、CFRP板条尺寸与黏结长度等影响因素下加固梁的受力行为。研究结果表明:与传统纤维复合材料加固技术相比,NEEE预应力CFRP加固技术具有更大的极限承载力和延性,且能有效抑制混凝土保护层剥离破坏。增大板条厚度会增大加固梁的刚度,但可能引起板端混凝土保护层过早剥离破坏。增大黏结长度能够改善加固梁的延性,减小板端弯矩,提高屈服荷载和极限承载力。The effectiveness of the new strengthening system of near-end enhanced embedded(NEEE)prestressed carbon fiber reinforced polymer(CFRP)strips was investigated through a study on the mechanical behavior of strengthened beams under various strengthening methods,sizes of CFRP strips,and bond lengths.The test results demonstrate that the NEEE prestressed CFRP strengthening technique results in superior ultimate bearing capacity and ductility compared to traditional strengthening techniques with fiber composite materials,effectively preventing concrete cover separation failure.Increasing the thickness of the strips enhances the stiffness of strengthened beams.However,it may also lead to premature failure due to concrete cover separation at strip ends.Additionally,increasing bond length improves the ductility of strengthened beams,reduces bending moment at strip ends,and increases yield load and ultimate bearing capacity.

关 键 词：结构工程 加固 嵌贴 CFRP 受力性能 

分 类 号：O319.56[理学—一般力学与力学基础]