增设无预应力段NSMCFRP加固RC梁数值研究  

Numerical simulation of NSM CFRP strengthened RC beams with added non-prestressed section

作　　者：吕卉敏 彭晖[1] 龚爽 LYU Huimin;PENG Hui;GONG Shuang(School of Civil and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木与环境工程学院,湖南长沙410114

出　　处：《交通科学与工程》2025年第2期105-113,共9页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(52178186、51578078)。

摘　　要：【目的目的】研究增设无预应力段表层嵌贴(near-surface-mounted,NSM)碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)加固梁的抗弯性能。【方法方法】在试验数据的基础上采用ABAQUS有限元软件建立CFRP加固梁的数值模型(通过非线性弹簧单元模拟CFRP板和混凝土以及混凝土和钢筋之间的黏结滑移关系),通过该数值模型考察不同CFRP板的预应力水平、CFRP板黏结长度和端部无预应力段长度等因素对加固梁抗弯性能的影响。【结果结果】将数值模拟结果与试验结果进行对比分析后可知,相较于无预应力CFRP板加固梁,全预应力CFRP板加固梁的抗弯性能明显提高;随着黏结长度和端部无预应力段长度的增加,加固梁的抗弯承载性能均呈现先增大后减小的趋势;当采用初始预应力为900MPa、黏结长度为2300mm、端部无预应力段长度为300mm的CFRP板时,加固梁的抗弯性能最好。【结论结论】该数值模型能较准确地预测加固梁的极限荷载、裂缝发展过程及破坏模式。[Purposes]This study aims to research the flexural performance of near-surface-mounted(NSM)carbon fiber reinforced polymer(CFRP)strengthened beams with added non-prestressed sections.[Methods]A numerical model of the strengthened beam was established using the ABAQUS finite element software based on the test data.The bond-slip relationship between the CFRP plate and concrete as well as between concrete and steel bars was simulated by nonlinear spring elements.The numerical model was used to investigate the influence of different prestress levels of the CFRP plate,the bond length of the CFRP plate,and the length of the non-prestressed section at the end on the flexural performance of the strengthened beam.[Findings]The numerical simulation results were compared with the test results.Compared with the non-prestressed CFRP plate strengthened beam,the fully prestressed CFRP plate strengthened beam exhibits significantly improved flexural performance.With the increase in the bond length and the length of the non-prestressed section at the end,the flexural bearing capacity of the strengthened beam increases first and then decreases.The flexural performance of the strengthened beam is the best in the case of using a CFRP plate with the initial prestress of 900 MPa,the bond length of 2300 mm,and the length of the non-prestressed section at the end to be 300 mm.[Conclusions]The comparison results show that the numerical model can accurately predict the ultimate load,crack development process,and failure mode of the strengthened beam.

关 键 词：表层嵌贴 CFRP 预应力 抗弯性能 数值模拟 

分 类 号：O319.56[理学—一般力学与力学基础]