持载与湿热环境下CFRP加固高强混凝土梁结构性能研究
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摘要
夏季湿热的大气环境对我国大部分地区的CFRP(碳纤维增强聚合物)加固钢筋混凝土结构性能有不利影响。为探讨湿热环境与荷载耦合作用对CFRP加固高强钢筋混凝土梁结构性能的影响,共制作16根CFRP加固钢筋混凝土梁试件,在不同温湿度环境下,对荷载与湿热环境耦合作用下CFRP加固钢筋混凝土梁进行试验研究与理论分析。试验结果表明:随湿热环境作用时间增加,CFRP加固混凝土梁剥离破坏界面由混凝土层逐渐转移到树脂胶层;荷载与湿热环境的耦合作用对CFRP加固钢筋混凝土梁极限承载力影响较明显;湿热环境对加固钢筋混凝土梁的结构性能有不利影响。
CFRP( Carbon Fiber Reinforced Polymer) reinforced concrete structure has been adopted in most parts of China,the hygrothermal environment in summer adversely affects its structural performance. In order to investigate the influence of hygrothermal environment on the structural properties of CFRP reinforced high strength reinforced concrete beams,a total of 16 specimens of CFRP strengthened concrete beams were made. Under different temperature and humidity conditions,the CFRP reinforced concrete beams under the coupling of load and hygrothermal environment was tested and analyzed. The experimental results show that with the increased exposure during hygrothermal environment,the peeling-failure interface of CFRP strengthened concrete beam is gradually transferred from the concrete layer to the resin layer. The coupling effect between load and hygrothermal environment has obvious influence on the ultimate bearing capacity of CFRP-strengthened RC beams. The hygrothermal environment has an adverse effect on the structural performance of RC beams.
CFRP( Carbon Fiber Reinforced Polymer) reinforced concrete structure has been adopted in most parts of China,the hygrothermal environment in summer adversely affects its structural performance. In order to investigate the influence of hygrothermal environment on the structural properties of CFRP reinforced high strength reinforced concrete beams,a total of 16 specimens of CFRP strengthened concrete beams were made. Under different temperature and humidity conditions,the CFRP reinforced concrete beams under the coupling of load and hygrothermal environment was tested and analyzed. The experimental results show that with the increased exposure during hygrothermal environment,the peeling-failure interface of CFRP strengthened concrete beam is gradually transferred from the concrete layer to the resin layer. The coupling effect between load and hygrothermal environment has obvious influence on the ultimate bearing capacity of CFRP-strengthened RC beams. The hygrothermal environment has an adverse effect on the structural performance of RC beams.
引文
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[2]李璐希.荷载与环境共同作用下CFRP与高强混凝土的粘结耐久性研究[D].大连:大连理工大学,2015.
[3]Myers J J,Murthy S,Micelli F.Effect of combined environmental cycles on the bond of FRP sheets to concrete[C]//Proceedings-Composites in Construction,2001 International Conference,Porto Portugal.2001.
[4]万先虎.高温干湿交替环境下FRP-混凝土界面粘结性能的耐久性研究[D].哈尔滨:哈尔滨工业大学,2013.
[5]Woods J M,Woods J M.Accelerated testing for bond reliability of fiber-reinforced polymers(FRP)to concrete and steel in aggressive environments[J].Journal of Enterprise Information Management,2003,18(5):531-547.
[6]李浩麟,郑小红,黄培彦.湿热对CFRP-混凝土界面粘结性能的影响[C]//全国建设工程frp应用学术交流会,2013.
[7]李杉.环境与荷载共同作用下FRP加固混凝土耐久性[D].大连:大连理工大学,2009.
[8]李凤兰,凡有纪,肖文,等.双高混凝土优化配制试验研究[J].华北水利水电大学学报(自然科学版),2017,38(2):37-42.
[9]Abanilla M A,Li Y,Karbhari V M.Durability characterization of wet layup graphite/epoxy composites used in external strengthening[J].Composites Part B Engineering,2006,37(2/3):200-212.
[10]王吉忠,张建.海洋环境下CFRP-混凝土粘结性能的试验研究[J].水利与建筑工程学报,2013,11(4):51-55.
[11]洪雷,张雨剑,王苏岩.冻融循环作用下CFRP-高强混凝土的界面行为[J].水利与建筑工程学报,2016,14(3):200-205.
[12]周昊.湿热环境下FRP加固RC构件耐久性实验方法研究[D].广州:华南理工大学,2012.
[13]Homam S M.Fiber Reinforced Polymers(FRP)and FRP-concrete Composites Subjected to Various Loads and Environmental Exposures[M].Canada:University of Toronto,2005.
[14]Chu W,Wu L,Karbhari V M.Durability evaluation of moderate temperature cured E-glass/vinylester systems[J].Composite Structures,2004,66(1/4):367-376.
[15]周昊,覃广,黄培彦.湿热环境下FRP加固RC梁耐久性实验方法研究[C]//2013中国力学大会,2013.
[16]Chen J F,Teng J G.Anchorage strength models for FRP and steel plates bonded to concrete[J].Journal of Structural Engineering,2001,127(7):784-791.