CFRP加固混凝土结构粘结疲劳性能试验研究
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摘要
CFRP加固是当今一项比较热门的新型加固技术,由于CFRP的高强轻质、耐腐蚀、便于施工等特点成为越来越多的科研工作者和工程师们研究分析的热点问题。加固混凝土结构时,采用粘结树脂将CFRP牢牢粘贴在混凝土构件的受拉区域,在外荷载的作用下通过粘结胶层来传递界面的剪应力。CFRP加固混凝土结构的效果取决于界面粘结性能的好坏,因此,对于粘结界面力学性能的分析研究有着十分重要的意义。本文设计了一种双剪试件,针对CFRP与混凝土界面的静载、疲劳性能进行了试验研究和理论分析,主要研究工作如下:
(1)采用二种不同种类的粘结树脂加固混凝土试件,通过静载试验分析粘结界面内应力应变的变化发展、界面损伤以及不同粘结树脂对界面极限承载力的影响。运用现有的二类界面理论模型对界面的极限承载力进行模拟计算,将试验结果与理论结果对比分析,发现在计算界面极限承载力时需要考虑粘结胶层的剪切刚度。
(2)通过疲劳荷载试验研究界面的疲劳性能,初步探讨了CFRP板与混凝土粘结界面在疲劳荷载作用下应力应变分布、剥离裂缝的产生发展模式和疲劳过程中粘结界面内各点的损伤累积情况。
(3)考虑不同的CFRP粘贴长度和不同粘结胶层厚度对界面疲劳性能的影响,比较在不同参数下疲劳损伤速率和沿CFRP板长度方向内各点损伤累积的差异。研究各参数对界面疲劳性能影响程度的大小。
(4)使用ANSYS软件建立了简单的有限元模型对本试验进行了仿真分析,分析结果与试验结果吻合较好。
Carbon Fiber Reinforced Polymer(CFRP) reinforcement is new heating technology in structure strengthening nowadays. Due to its favorable features of high strength, light weight, corrosion resistance and convenient construction etc, carbon fiber composite materials have became to the constant focus for study and analysis by scientists and engineers. When it's utilized in strengthening concrete structures, CFRP is wrapped in resin bonding, and firmly attached to the tension zone of concrete, bearing shearing force transmitting through resin bonding slayer caused by external force. Since the CFRP’s effect on concrete structure lies in the performance of resin bonding interface, it is critical for researchers to conduct mechanical performance of the bonding slayer. This article carries out experiments on static loads and fatigue performance of the bonding slayers between CFRP and concrete by presenting a twin-shear specimen, leading to experimental studies as well as theoretical analysis, the working procedure lies as follow:
(1) Static Loads experiments are conducted by using two different types of resin bondings in strengthening concrete specimen with CFRP, analyzing deveplopments of stress and strain within the bonding interface, interfacial damages variating process and ultimate bearing capacity of different resin bondings of the bonding interface. Use two types of interface theoretical models to simulate the interface of the ultimate bearing capacity, compared with the theoretical results and test results, found the shear stiffness should be considered when calculate ultimate bearing capacity of the interface.
(2) The fatigue loading experiment explores the fatigue properties of bonding slayer, preliminary discusses the stress and strain distribution of bonding interface between CFPR and concrete under fatigue loading, the generating and developing models of depriving crack and fatigue damage accumulations.
(3) Considering the influence of different bonding length of CFPR and thickness of CFPR's resin bonding on the fatigue performance of the interface, this article compares and analyzes the difference of the fatigue damage speed and damage accumulation along the CFRP under varying parameters, determining the influence of various parameters on fatigue performance of the bonding interface.
(4) Utilizing ANSYS software to establish a simple finite element model, Conducted a simulation analysis of the test with this model. The analysis results proved to coincide with the experimental results.
(1)采用二种不同种类的粘结树脂加固混凝土试件,通过静载试验分析粘结界面内应力应变的变化发展、界面损伤以及不同粘结树脂对界面极限承载力的影响。运用现有的二类界面理论模型对界面的极限承载力进行模拟计算,将试验结果与理论结果对比分析,发现在计算界面极限承载力时需要考虑粘结胶层的剪切刚度。
(2)通过疲劳荷载试验研究界面的疲劳性能,初步探讨了CFRP板与混凝土粘结界面在疲劳荷载作用下应力应变分布、剥离裂缝的产生发展模式和疲劳过程中粘结界面内各点的损伤累积情况。
(3)考虑不同的CFRP粘贴长度和不同粘结胶层厚度对界面疲劳性能的影响,比较在不同参数下疲劳损伤速率和沿CFRP板长度方向内各点损伤累积的差异。研究各参数对界面疲劳性能影响程度的大小。
(4)使用ANSYS软件建立了简单的有限元模型对本试验进行了仿真分析,分析结果与试验结果吻合较好。
Carbon Fiber Reinforced Polymer(CFRP) reinforcement is new heating technology in structure strengthening nowadays. Due to its favorable features of high strength, light weight, corrosion resistance and convenient construction etc, carbon fiber composite materials have became to the constant focus for study and analysis by scientists and engineers. When it's utilized in strengthening concrete structures, CFRP is wrapped in resin bonding, and firmly attached to the tension zone of concrete, bearing shearing force transmitting through resin bonding slayer caused by external force. Since the CFRP’s effect on concrete structure lies in the performance of resin bonding interface, it is critical for researchers to conduct mechanical performance of the bonding slayer. This article carries out experiments on static loads and fatigue performance of the bonding slayers between CFRP and concrete by presenting a twin-shear specimen, leading to experimental studies as well as theoretical analysis, the working procedure lies as follow:
(1) Static Loads experiments are conducted by using two different types of resin bondings in strengthening concrete specimen with CFRP, analyzing deveplopments of stress and strain within the bonding interface, interfacial damages variating process and ultimate bearing capacity of different resin bondings of the bonding interface. Use two types of interface theoretical models to simulate the interface of the ultimate bearing capacity, compared with the theoretical results and test results, found the shear stiffness should be considered when calculate ultimate bearing capacity of the interface.
(2) The fatigue loading experiment explores the fatigue properties of bonding slayer, preliminary discusses the stress and strain distribution of bonding interface between CFPR and concrete under fatigue loading, the generating and developing models of depriving crack and fatigue damage accumulations.
(3) Considering the influence of different bonding length of CFPR and thickness of CFPR's resin bonding on the fatigue performance of the interface, this article compares and analyzes the difference of the fatigue damage speed and damage accumulation along the CFRP under varying parameters, determining the influence of various parameters on fatigue performance of the bonding interface.
(4) Utilizing ANSYS software to establish a simple finite element model, Conducted a simulation analysis of the test with this model. The analysis results proved to coincide with the experimental results.
引文
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[2]黄安芳,邓金星,刘春华.?钢筋砼箱肋拱桥加固技术的应用及探讨.广西大学学报(自然科学版),2006,31(6):264-266.
[3]郑贤忠,诸葛忠,肖航.混凝土连续板边界改变后的CFRP片材加固设计.四川建筑,2001(3):116-118.
[4] Jeremy A. Martin, Anthony J. Lamanna. Performance of Mechanically Fastened FRP Strengthened Concrete Beams in Flexure. Journal of composites for construction,2008,12(3):257-265.
[5] Han Tae Choi,Jeffrey S. West,Khaled A. Soudki. Analysis of the Flexural Behavior of Partially Bonded FRP Strengthened Concrete Beams. Journal of Composites for Comstruction,2008,12(4).375-386.
[6] Dong-Suk Yang,Sun-Kyu Park, Kenneth W. Neale. Flexural behaviour of reinforced concrete beams strengthened with prestressed carbon composites. Composite Structures,2009,88(4):497–508.
[7] Alfarabi Sharif,G.J.Al-SulaimaniI.A.Basunbul,M.H.Baluch,and B.N. Ghaleb. Strengthening of corrosion Damaged Concrete Beams Using FRP-plates.ACI Structural Journal,1994,91(2):160-168.
[8]彭晖,尚守平,张建仁,李传习.预应力CFRP板加固T梁的试验与理论研究.公路交通科技,2009,26(10):59-65.
[9]贺学军,周朝阳,徐玲.内嵌CFRP板条加固混凝土梁的抗弯性能试验研究.土木工程学报,2008,41(12):14-20.
[10]陈小兵,颜子涵,岳清瑞,牟宏远.碳纤维材料加固钢筋混凝土梁的试验研究.工业建筑,1998,28(11):6-10.
[11]李松辉,赵国藩,王松根.粘贴碳纤维布加固钢筋混凝土预裂梁试验研究.土木工程学报,2005,38(10):88-92.
[12]谭壮,叶列平.?FRP加固混凝土结构剥离问题研究综述.?第二届全国土木工程用纤维增强复合材料(FRP)应用技术学术交流会,2002(7):229-234.
[13]邢建英,杨勇新.?FRP加固构件的粘结机理综述.福建建筑,2008(6):45-48.
[14] Micheal J , Chajes,Willian W. Finch, Ted F Januszka, Theodore A.Thomson . Bond and force transfer of composite material plates bonded to concrete.ACIStructural Journal,1996,93(2), 208-217.
[15]曹双寅,潘建伍,陈建飞,孙宁.外贴纤维与混凝土结合面的粘结滑移关系.建筑结构学报,2006,27(1):99-105.
[16]姚谏,滕锦光. FRP复合材料与混凝土的粘结强度试验研究.建筑结构学报,2003,24(5):10-23.
[17]杨勇新,岳清瑞,胡云昌.碳纤维布与混凝土粘结性能的试验研究.建筑结构学报,2001,22(3):36-42.
[18]肖建庄,李杰,魏锦涛.纤维布与混凝土之间粘结力的试验方法研究.玻璃钢/复合材料,2002(3):3-6.
[19]李艳,刘泽军,胡春红.碳纤维片材抗弯加固钢筋混凝土梁剥离界面剪应力试验研究.河南理工大学学报(自然科学版),2007,26(6):700-706.
[20]方恩权.碳纤维布与混凝土界面粘结性能试验研究.郑州大学,2005.
[21]李荣,滕锦光,岳清瑞.嵌入式CFRP板条-混凝土界面粘结性能的试验研究.工业建筑,2005,35(8)31-34.
[22]郭樟根,孙伟民,闵珍. FRP与混凝土界面粘结性能的试验研究.南京工业大学学报,2006,28(6):37-42.
[23] Roberts. T. M. ,Approximate Analysis of Shear and Normal Stress Concentration in the Adhesive Layer of Plated RC Beams. Structural Engineering,1989(12):228-233.
[24] Amir M. Malek , Hamid Saadatmanesh , and Mohammad R. Ehsani. Prediction of Failure Load of RC Beams Strengthened with FRP Plate Due to Stress Concentration at the Plate End. ACI Structural Journal,1998(3-4):142-153.
[25] Christopher K. Y. Leung. Delamination Failure in Concrete Beams Retrofitted with A Bonded Plate. Journal of Materials in Civil Engineering, 2001(3-4):106-133.
[26] O. Rabinovitch ,and Y. Frostig. High2Order Approach for the Control of Edge Stresses in RC Beams Strengthened with FRP Strips.Journal of Structural Engineering,2001(7):799-809.
[27] M. Raoof ,and M. A. Hassanen. Peeling Failure of Reinforced Concrete Beams with Fiber2Reinforced Plastic or Steel Plates Glued to Their Soffits. Engineering Structure and Building,2000(8):291-305.
[28] Mahmoud T. EI2Mihilmy ,and Joseph W. Tedesco. Prediction of Anchorage Failure for Reinforced Concrete Beams Strengthened with Fiber2Reinforced Polymer Plates. ACI Structural Journal,2001,(5-6):301-314.
[29] J. F. Chen,J. G. Teng. Anchorage Strength Models for FRP and Steel PlatesBonded to Concrete. Journal of Structural Engineering, 2001(7):784-891
[30] Maeda T, Asano Y, Sato Y, Ueda T, Kakuta Y. A study on bond mechanism of carbon fiber sheet. Proc. 3rd Int. Symp. Nonmetallic ( FRP) Reinforcement for Concrete Structure. Japan Concrete Institute,Sapporo , 2004, (1):279-285.
[31] Chaallal O , Nollet M J , Perraton D. Strengthening of reinforced concrete beams with externally bonded fiber reinforced2plastic plates : Design guidelines for shear and flexure. Canada Journal of Civil Engineering,1998, 25(4):692-704.
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