FRP筋加固砌体结构界面粘结性能的研究现状

表面嵌入式(NSM)加固法为纤维增强塑料筋(FRP筋)加固砌体结构常用的方法,FRP筋脱粘破坏为其首要的破坏形态,研究FRP筋与砌体间的粘结性能和脱粘机理成了这项加固技术的关键。综述了国内外学者关于拉拔试验、界面剪切试验、弯曲试验以及数值模拟的研究进展,对NSM-FRP筋加固砌体结构的界面粘结性能进行了研究。研究发现加固砌体结构的变形能力、能量耗散能力和延性得到了显著增加,增加FRP筋的埋设深度可以有效提高脱粘荷载。最后使用收集到的试验数据对各种粘结性能相关公式进行了校核,对今后拟开展的研究提出了建议。

RESEARCH STATUS QUO OF INTERFACIAL BONDING PROPERTIES OF MASONRY STRUCTURES REINFORCED BY FRP BARS

Near-surface mounted (NSM) reinforcement is the common methods for reinforced masonry structure by FRP tendons.The debonding failure of FRP tendons as the primary failure mode,and the research on the bonding performance and debonding mechanism between FRP bars and masonry become the key to this reinforcement technology.In this paper,the progress of pull test,interface shear test,bending test and numerical simulation of domestic and foreign scholars are reviewed.The interfacial bonding properties of NSM-FRP reinforced masonry structures are studied.The results reveal that the deformation capacity,energy dissipation and ductility of masonry are significantly increased after strengthened by NSM-FRP bars.Increasing the embedding depth of FRP bars can effectively improve the debonding load.Finally,the relevant formulas of the various bonding parameters are checked by using the collected experimental data,and some suggestions are put forward for the future research.