CFRP板纵向加固RC柱在水平低周循环荷载下的力学性能研究与应用
RC Columns Strengthened with Vertically Adhesive-bonded CFRP Plates under Lateral Cyclic Loading:Study on Mechanical Properties and Application
强旭红 1陈岩松 1姜旭 1谭成1
作者信息
- 1. 同济大学 土木工程学院,上海 200092
- 折叠
摘要
开发了一种纵向粘贴CFRP(Carbon Fiber Reinforced Polymer,碳纤维增强复合材料)板的RC(Reinforced Concrete,钢筋混凝土)柱抗弯加固系统,该加固系统由纵向粘贴在柱表面的预制CFRP板和防止柱底CFRP板脱粘的混凝土加厚层组成.为研究纵向粘贴CFRP板对RC柱的抗弯性能影响,设计并开展了5根足尺矩形RC柱的水平低周循环加载试验.研究结果表明:粘贴CFRP板加固能有效延缓柱的开裂;柱的破坏模式得到明显改善;相较于未加固柱子,粘贴1层CFRP板和2层CFRP板加固的RC柱极限承载力分别提高了15.1%和17.4%;加固后柱的抗弯承载力和刚度得到提高,但增加CFRP板的层数对极限强度和刚度没有显著影响,反而会降低柱的延性,相较于仅采用增大柱底截面的方式加固的对照柱,粘贴1层CFRP板和2层CFRP板加固的试验柱的延性系数分别降低16.2%和35.1%;试验过程中,由于柱与基础节点承载力的限制,CFRP的最大应变仅达到极限应变的24%,抗拉强度未得到充分发挥.该加固方法已在某医院加固工程中得到应用,跟踪研究表明,加固后柱子的抗弯承载力有明显提升,加固方法得到工程业界的认可.
Abstract
A strengthening system for RC columns with adhesive-bonded vertical carbon fiber reinforced polymer(CFRP)plates was proposed.The strengthening system consisted of prefabricated vertical CFRP plates adhesively bonded to the column surface and a concrete jacket preventing the CFRP plates from debonding.To investigate the effect of adhesive-bonded CFRP plates on flexural behavior,five full-scale rectangular RC columns were tested under lateral cyclic loading.Experimental results showed that the cracking load of CFRP-strengthened columns was significantly improved compared to that of the reference column.The ultimate load-carrying capacities of the CFRP-strengthened columns were improved by 15.1%and 17.4%,respectively.The flexural capacity,and stiffness were improved by adhesively bonded vertical CFRP plates.However,no significant improvement in load-carrying capacity and stiffness of columns was observed for different amounts of CFRP plates.The ductility factor of the strengthened columns decreased by 16.2%and 35.1%,respectively.Since the limitation of column-foundation joint capacity,the strength of CFRP plates was not fully developed,and the CFRP strain at column failure was 24%of the ultimate strain.In addition,the proposed strengthening system was applied in a hospital strengthening project.A follow-up study showed that the flexural capacity of strengthened columns was significantly improved.The proposed strengthening system has been recognized by the civil engineering industry.
关键词
钢筋混凝土柱/抗弯加固/水平低周循环加载/碳纤维增强复合材料板/纵向粘贴Key words
RC columns/flexural strengthening/lateral cyclic load/carbon fiber reinforced polymer(CFRP)plate/vertically adhesive-bonding引用本文复制引用
基金项目
广东省重点领域研发计划项目(2019B111106002)
中建股份科技研发计划项目(CSCEC-2020-Z-1)
上海市自然科学基金项目(21ZR1466100)
中央高校基本科研业务费专项资金项目(22120210574)
上海市科技计划项目(20DZ2253000)
出版年
2024
国家科技期刊平台
NSTL
万方数据