GFRP加固损伤钢筋混凝土(RC)短梁受弯性能试验研究  

Experimental Study on Flexural Behavior of Damaged Reinforced Concrete(RC)Short Beams Strengthened with GFRP Sheets

作　　者：吴玉祥 王廷彦[1] 赵顺波[1] WU Yu-xiang;WANG Ting-yan;ZHAO Shun-bo(North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学,河南郑州450045

出　　处：《混凝土与水泥制品》2022年第10期65-69,73,共6页China Concrete and Cement Products

基　　金：河南省自然科学青年基金项目(212300410193);中国地震局工程力学研究所基本科研业务费专项资助项目(2020EEEVL0411)。

摘　　要：设计了普通钢筋混凝土(RC)短梁、GFRP布加固未损伤和损伤RC短梁试件,进行了四点弯曲试验,研究了短梁的破坏形态、材料(混凝土、钢筋、GFRP布)应变、抗弯承载力、挠度、曲率和抗弯刚度。结果表明:GFRP布加固未损伤和损伤RC短梁破坏时GFRP布被拉断,受压区混凝土未被压碎,属于延性破坏,跨中截面混凝土应变近似符合平截面假定;GFRP布加固未损伤和损伤RC短梁的极限承载力较普通RC短梁分别提高了47.8%和53.2%;GFRP布加固未损伤RC短梁的荷载-挠度曲线呈三阶段特征,GFRP布加固损伤RC短梁的荷载-挠度曲线没有开裂阶段,呈两阶段特征;采用GFRP布加固可提高RC短梁的刚度,但会降低其延性;对比GFRP布加固未损伤RC短梁,GFRP布加固损伤RC短梁的刚度出现较大退化,但延性提高。The ordinary reinforced concrete(RC)short beams,undamaged and damaged RC short beams strengthened with GFRP sheets were designed,and four point bending tests were carried out,and the failure modes,material(concrete,steel bar,GFRP sheet)strain,flexural capacity,deflection,curvature and flexural stiffness were studied.The results show that the undamaged and damaged RC short beams strengthened with GFRP sheets both belong to the ductility failure in which the GFRP sheets are pulled off and the concrete in the compression zone is not crushed,and the concrete strains of the mid-span section are approximately consistent with the assumption of plane section.The ultimate bearing capacity of undamaged and damaged RC short beams strengthened with GFRP sheets is 47.8%and 53.2%higher than that of ordinary RC short beams,respectively.The load-deflection curve of the undamaged RC short beams strengthened with GFRP sheets has a three-stage characteristic,while the load-deflection curve of the damaged RC short beams strengthened with GFRP sheets has no cracking stage,and has a two-stage characteristic.Using GFRP sheets can improve the stiffness of the RC short beams,but it will reduce its ductility.Compared with the undamaged RC short beams strengthened with GFRP sheets,the stiffness of the damaged RC short beams strengthened with GFRP sheets degrades greatly,but the ductility increases.

关 键 词：GFRP布 加固 钢筋混凝土(RC)短梁 损伤荷载 受弯性能 

分 类 号：TU375.1[建筑科学—结构工程]