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

作　　者：强旭红[1] 陈岩松 姜旭[1] 谭成 QIANG Xuhong;CHEN Yansong;JIANG Xu;TAN Cheng(College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《湖南大学学报（自然科学版）》2024年第7期148-163,共16页Journal of Hunan University:Natural Sciences

基　　金：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)。

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.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 

分 类 号：TU375[建筑科学—结构工程] TU599