CFRP网格-聚合物水泥砂浆加固RC梁抗剪承载力计算方法  

Study on calculation method of RC beam’s shear bearing capacity of CFRP grid-polymer cement mortar

作　　者：王博 王媛媛 王征鹏 张军雷 王天松 WANG Bo;WANG Yuanyuan;WANG Zhengpeng;ZHANG Junlei;WANG Tiansong(School of Civil Engineering,Chang’an University,Xi’an 710061,China;Department of Civil and Environmental Engineering,Tokyo Metropolitan University,Tokyo 192-0397,Japan)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]日本東京都立大学都市基盤環境学域,东京192-0397

出　　处：《复合材料学报》2023年第2期990-1003,共14页Acta Materiae Compositae Sinica

基　　金：陕西省青年科技新星项目(2021KJXX-17)。

摘　　要：为揭示碳纤维增强树脂复合材料(Carbon fiber reinforced polymer,CFRP)网格-聚合物水泥砂浆(Polymer cement mortar,PCM)抗剪加固钢筋混凝土(RC)梁的受剪机制并建立其承载力计算方法,对RC梁进行了四点弯曲试验和有限元模拟,重点分析了CFRP网格对RC加固梁的抗剪贡献,建立了基于改进的桁架拱模型的抗剪承载力计算方法。结果表明:RC梁侧粘贴CFRP网格-PCM加固层不仅可以抑制斜裂缝的发展,而且还提高了抗剪承载力;CFRP网格与钢筋之间具有良好的协同工作性能,其中,横向CFRP网格筋分担了约16%的箍筋应变;回归分析指出纵向CFRP网格筋的应变约为横向CFRP网格筋应变的0.29倍;综合考虑纵向CFRP网格的销栓作用和横向CFRP网格分担的箍筋应变,提出了基于改进桁架-拱模型的承载力计算方法,具有更好的适用性和准确性,能够满足设计要求。In order to reveal the shear mechanism of the carbon fiber reinforced polymer(CFRP)grid-polymer cement mortar(PCM)shear reinforced reinforced concrete(RC)beam and establish its bearing capacity calculation method,four-point bending tests and finite element simulation were conducted on the RC beams.The shear contribution of the CFRP grid to the RC reinforced RC beam was analyzed,and the shear bearing capacity calculation method was established based on the improved truss arch model.The results show that the CFRP grid-PCM reinforcement layer can not only inhibit the development of inclined cracks,but also improve the shear bearing capacity.CFRP grid and reinforcement have good cooperative working performance,where the horizontal CFRP grid shares about 16%of the stirrup strain.Regression analysis indicates that the strain of the vertical CFRP grid is about 0.29 times than that of the horizontal CFRP grid.Comprehensively considering the dowel action of the longitudinal CFRP grid and the stirrup strain shared by the horizontal CFRP grid,the bearing capacity calculation method is presented based on the improved truss-arch model,which has better applicability and accuracy to meet the design requirements.

关 键 词：CFRP网格-PCM抗剪加固RC梁 四点弯曲试验 有限元分析 改进的桁架-拱模型 承载力计算方法 

分 类 号：TU[建筑科学]