锈蚀变形钢筋混凝土受弯构件的受力性能试验研究
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摘要
针对钢筋锈蚀对受弯构件受力性能的影响展开系统的试验研究,共进行了24根试件的试验,采用电化学锈蚀方法对试件钢筋进行快速锈蚀,研究了钢筋直径、钢筋锈蚀率等影响因素对受弯构件性能的影响。试验结果表明:钢筋锈蚀削弱了钢筋与混凝土之间的粘结,降低了构件的抗弯刚度,刚度的减小幅度随锈蚀率的增大而提高;同时也影响了截面的变形协调,致使受弯构件的承载能力降低;锈蚀率相近的构件承载力退化基本相当,锈蚀试件的屈服挠度显著大于未锈蚀构件,但混凝土边缘压应变与未锈蚀试件基本相当,表明钢筋本身削弱的影响略大于粘结退化的影响。
The influence of corrosion of rebars on mechanical behavior of flexural beams was systematically studied through experiment.A total of 24 beam specimens were tested to investigate the effects of rebar diameter and corrosion ratio,etc.on the behavior of flexural beams by using electrochemical corrosion method for rapid corrosion of rebars.The experimental results indicate that(1) Corrosion degraded the bond between rebars and concrete,reduced the bending stiffness of the members.The reducing margin of bending stiffness increaseds with the increase of corrosion rate.The deformation compatibility of cross-section was affected by corrosion as well,which led to decline of bearing capacity of flexural beams.(2) The beams with similar corrosion rates show a comparable deterioration degree of bearing capacity.The yield deflection of corroded beams is significantly greater than that of uncorroded beams,but edge concrete compressive strain of corroded beams is equal to that of uncorroded beams,which shows that the degradation of beams caused by steel deterioration is greater than that caused by bond deterioration.
The influence of corrosion of rebars on mechanical behavior of flexural beams was systematically studied through experiment.A total of 24 beam specimens were tested to investigate the effects of rebar diameter and corrosion ratio,etc.on the behavior of flexural beams by using electrochemical corrosion method for rapid corrosion of rebars.The experimental results indicate that(1) Corrosion degraded the bond between rebars and concrete,reduced the bending stiffness of the members.The reducing margin of bending stiffness increaseds with the increase of corrosion rate.The deformation compatibility of cross-section was affected by corrosion as well,which led to decline of bearing capacity of flexural beams.(2) The beams with similar corrosion rates show a comparable deterioration degree of bearing capacity.The yield deflection of corroded beams is significantly greater than that of uncorroded beams,but edge concrete compressive strain of corroded beams is equal to that of uncorroded beams,which shows that the degradation of beams caused by steel deterioration is greater than that caused by bond deterioration.
引文
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[13]赵羽习,金伟良.钢筋锈蚀导致混凝土构件保护层胀裂的全过程分析[J].水利学报,2005,36(8):939-945.ZHAO Yuxi,JIN Weiliang.Analysis on the Cracking ofConcrete Cover due to Rebar Corrosion[J].Journal ofHydraulic Engineering,2005,36(8):939-945.
[14]王海龙,金伟良,孙晓燕.基于断裂力学的钢筋混凝土保护层锈胀开裂模型[J].水利学报,2008,39(7):863-869.WANG Hailong,JIN Weiliang,SUN Xiaoyan.FractureModel for Protective Layer Cracking of Reinforced ConcreteStructure Due to Rebar Corrosion[J].Journal ofHydraulic Engineering,2008,39(7):863-869.
[15]宋志刚,金伟良,刘芳,等.钢筋锈蚀率概率分布的动态演进模拟[J].浙江大学学报,2006,40(10):1749-1754.SONG Zhigang,JIN Weiliang,LIU Fang,et al.Dynamic Simulation Method for Probability Evolution ofReinforcement Steel Corrosion[J].Journal of ZhejiangUniversity,2006,40(10):1749-1754.
[2]WANG X,LIU X.Bond Strength Modeling for CorrodedReinforcements[J].Construction and Building Materials,2006,20:177-186.
[3]MANGAT P,ELGARF M.Flexural Strength of ConcreteBeams with Corroding Reinforcement[J].ACI StructuralJournal,1999,96(1):149-158.
[4]CAPOZUCCA R,CERRI M N.Influence of ReinforcementCorrosion-In the Compressive Zone:On the Behaviour ofRC Beams[J].Engineering Structures,2003,25(13):1575-1583.
[5]袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001,34(3):47-52.YUAN Yingshu,JIA Fuping,CAI Yue.The StructuralBehavior Deterioration Model for Corroded ReinforcedConcrete Beams[J].China Civil Engineering Journal,2001,34(3):47-52.
[6]吴庆,袁迎曙.基于钢筋锈蚀的混凝土梁承载能力退化预计模型[J].中国矿业大学学报,2008,37(4):509-513.WU Qing,YUAN Yingshu.A Model for Degeneration inBearing Capacity of Concrete Beams with CorrodedReinforcing Bars[J].Journal of China University ofMining&Technology,2008,37(4):509-513.
[7]史庆轩,牛荻涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程振动,2000,20(4):44-50.SHI Qingxuan,NIU Ditao,YAN Guiyun.ExperimentalResearch on Hysteretic Characteristics of Corroded R.C.Members with Flexural and Compressive Axial Loads underRepeated Horizontal Loading[J].Earthquake Engineeringand Engineering Vibration,2000,20(4):44-50.
[8]金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2002.JIN Weiliang,ZHAO Yuxi.Durability of ConcreteStructures[M].Beijing:Science Press,2002.
[9]金伟良,赵羽习,鄢飞.钢筋混凝土构件的均匀钢筋锈胀力及其影响因素[J].工业建筑,2001,31(5):6-8.JIN Weiliang,ZHAO Yuxi,YAN Fei.CorrodedExpansion Force of Reinforced Concrete Members and ItsInfluence Factors[J].Industrial Construction,2001,31(5):6-8.
[10]张建仁,李传习,王磊,等.既有钢筋混凝土拱肋承载力测试与分析[J].工程力学,2006,23(12):136-142.ZHANG Jianren,LI Chuanxi,WANG Lei,et al.Experiment and Analysis on the Ultimate Strength ofExisting Reinforced Concrete Arch Rib[J].EngineeringMechanics,2006,23(12):136-142.
[11]赵羽习,金伟良,混凝土锈胀时刻钢筋锈蚀率的数值分析方法[J].浙江大学学报,2008,42(6):1080-1084.ZHAO Yuxi,JIN Weiliang.Numerical-based Method forCalculating Reinforcement Corrosion at Concrete CoverCracking due to Corrosion[J].Journal of ZhejiangUniversity,2008,42(6):1080-1084.
[12]赵羽习,金伟良.锈蚀钢筋与混凝土粘结性能的试验研究[J].浙江大学学报,2002,36(4):352-356.ZHAO Yuxi,JIN Weiliang.Test Study on Bond Behaviorof Corroded Steel Bars and Concrete[J].Journal ofZhejiang University,2002,36(4):352-356.
[13]赵羽习,金伟良.钢筋锈蚀导致混凝土构件保护层胀裂的全过程分析[J].水利学报,2005,36(8):939-945.ZHAO Yuxi,JIN Weiliang.Analysis on the Cracking ofConcrete Cover due to Rebar Corrosion[J].Journal ofHydraulic Engineering,2005,36(8):939-945.
[14]王海龙,金伟良,孙晓燕.基于断裂力学的钢筋混凝土保护层锈胀开裂模型[J].水利学报,2008,39(7):863-869.WANG Hailong,JIN Weiliang,SUN Xiaoyan.FractureModel for Protective Layer Cracking of Reinforced ConcreteStructure Due to Rebar Corrosion[J].Journal ofHydraulic Engineering,2008,39(7):863-869.
[15]宋志刚,金伟良,刘芳,等.钢筋锈蚀率概率分布的动态演进模拟[J].浙江大学学报,2006,40(10):1749-1754.SONG Zhigang,JIN Weiliang,LIU Fang,et al.Dynamic Simulation Method for Probability Evolution ofReinforcement Steel Corrosion[J].Journal of ZhejiangUniversity,2006,40(10):1749-1754.
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