摘要
为研究加固后锈蚀箍筋约束混凝土柱的抗震性能,设计16个钢筋混凝土矩形柱,对加速锈蚀后的试件采用外包钢及CFRP、GFRP材料进行加固处理,随后开展低周往复荷载试验,以研究不同加固材料、不同加固包裹方式、不同黏结材料等因素对锈蚀箍筋约束混凝土柱滞回曲线、骨架曲线、刚度衰减、延性性能及耗能能力等抗震性能指标的影响。研究结果表明:(1)与未锈蚀柱相比,加固后的箍筋锈蚀柱以弯剪破坏为主,CFRP加固试件较GFRP加固试件具有更高的承载力,但破坏时延性不如GFRP加固试件;(2)外包钢加固试件、CFRP加固试件、GFRP加固试件的耗能能力较未锈蚀试件分别增大222.3%、123.9%、98.5%,延性系数也相应增大45.3%、22.3%、25.6%。总之,外包钢加固对箍筋锈蚀柱抗震性能的提升最大,CFRP加固次之,但优于GFRP加固;整包加固优于环包加固;环氧树脂胶黏结略优于水泥基灌浆料黏结。
In this study,the seismic performance of concrete columns confined by corroded stirrups after reinforcement was studied.Sixteen reinforced concrete(RC)rectangular columns were designed,and the corrosion-accelerated specimens were strengthened with enveloped steel and carbon fiber reinforced polymer(CFRP)and glass fiber reinforced polymer(GFRP).Finally,low-frequency cyclic loading tests were performed to investigate the effects of different reinforcement materials,different reinforcement wrapping methods,and different bonding materials on the hysteresis curve,skeleton curve,stiffness attenuation,ductility performance,and energy dissipation capacity of the RC columns confined by corroded stirrups.The findings revealed that(1)compared with the noncorroded column,the strengthened corroded column is dominated by bending shear failure.The CFRP-strengthened specimen has a higher bearing capacity than the GFRP-strengthened specimen,but its ductility is lower than that of the GFRP-strengthened specimen.(2)Compared with the noncorroded column,the energy dissipation capacities of the enveloped steel-strengthened specimen,the CFRP-strengthened specimen,and the GFRP-strengthened specimen are increased by 222.3%,123.9%,and 98.5%,respectively as well as their ductility coefficients by 45.3%,22.3%,and 25.6%,respectively.Therefore,enveloped steel reinforcement offers the greatest improvement in seismic performance of stirrup-corroded columns;moreover,CFRP reinforcement is superior to GFRP reinforcement,whole-clad reinforcement is better than ring-clad reinforcement,and epoxy resin adhesive has slightly better bonding than cement-based grout.
作者
李强
贺胜
金宇琨
董嘉辉
常迪文
LI Qiang;HE Sheng;JIN Yukun;DONG Jiahui;CHANG Diwen(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,Shaanxi,China)
出处
《地震工程学报》
CSCD
北大核心
2023年第5期1179-1188,共10页
China Earthquake Engineering Journal
基金
锈蚀钢筋混凝土加固柱抗震性能研究(2017JM5045)。
关键词
箍筋锈蚀
抗震性能
低周往复加载试验
加固方法分析
stirrup corrosion
seismic performance
low-frequency cyclic loading test
analysis of reinforcement methods
