预应力NSM CFRP加固悬臂梁有限元与试验研究

Finite element analysis and test research on cantilever beams strengthened with pre-stressed near-surface-mounted CFRP strips

为研究表层嵌贴碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)加固技术对悬臂梁性能的提升效果,采用ABAQUS有限元分析软件建立了悬臂梁的数值模型,分别分析了CFRP加固方式、CFRP加固率、CFRP预应力对悬臂加固梁抗弯性能的影响,并在数值模拟的基础上选取部分试件进行现场试验,分析其加载过程、破坏模式、荷载-挠度曲线和钢筋应变,以此验证有限元模型的准确性。结果表明:有限元模型结果与试验结果吻合良好,能够有效地预测加固梁的极限荷载、挠度及损伤模式;CFRP加固方式、CFRP加固率、CFRP预应力对悬臂加固梁的承载力都有较显著的影响。通过表层嵌贴预应力CFRP加固悬臂梁的有限元与试验研究,验证了表层嵌贴CFRP预应力加固技术应用于悬臂梁的可行性。

To investigate the improvement effect of carbon fiber reinforced polymer(CFRP)reinforcement technology on the performance of cantilever beams,a numerical model of the cantilever beam was established using ABAQUS finite element analysis software.The effects of CFRP reinforcement method,CFRP reinforcement rate,and CFRP prestress on the bending performance of cantilever reinforced beams were analyzed.And based on numerical simulation,some specimens were selected for on-site testing to analyze their loading process,failure mode,load deflection curve,and steel bar strain,in order to verify the accuracy of the finite element model.The results show that the finite element model is in good agreement with the experimental results,and can effectively predict the ultimate load,deflection,and damage mode of the reinforced beam;The CFRP reinforcement method,CFRP reinforcement rate,and CFRP prestressing all have a significant impact on the bearing capacity of cantilever reinforced beams.In addition,The feasibility of applying surface embedded prestressed CFRP reinforcement technology to cantilever beams was verified through finite element and experimental research.