The Assessment of Using CFRP to Enhance the Behavior of High Strength Reinforced Concrete Corbels
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Abstract
In this research, an experimental study is conducted to investigate the behavior and strength of high strength reinforced concrete corbels externally bonded with CFRP fabric sheets and Plates with different patterns taking into account the effect of adopted variables in enhancing the ultimate strength; the effect of shear span to effective depth (a/d), configuration, type and amount of bonding. Eleven high strength reinforced corbels were cast and tested under vertical loads. Test results showed there was an improvement in the behavior and load carrying capacity of all strengthened corbels. An increasing in the ultimate strength of strengthened corbel by inclined CFRP strips reached to (92.1%) while the increasing reached to (84.21%) for using one horizontal CFRP Plates compared to un-strengthened reference specimen. Also, it can be conducted that the increase of (a/d) ratio from (0.6 to 0.8) resulted in decreasing by 21.05% in ultimate load capacity of corbels and from (0.4 to 0.6) by 31.25% and 58.69% in cracking and ultimate loads respectively.
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THIS IS AN OPEN ACCESS ARTICLE UNDER THE CC BY LICENSE http://creativecommons.org/licenses/by/4.0/
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References
Campione, G., Mendola ,L. La. and Papia M. ,"Flexural Behaviour Of Concrete Corbels Containing Steel Fibers Or Wrapped With FRP Sheets", Materials and Structures, 2005, 617-625.
Kriz, L.B. and Raths, C.H. , "Connections in Precast Concrete Structures-Strength of Corbels", PCI journal, 1965, 10 (1) , 16-61.
Yousif , A. R., " Prediction Of Ultimate Load Capacity Of High-Strength Reinforced Concrete Corbels ", Al-Rafidain Engineering, 2009, 17 (4).
Klaiber, F.W., Wipf, j.j. and Kempers, B.j. ,"Repair of Damaged Prestressed Concrete Bridges Using CFRP", Ames, Iowa State University, 2003.
ACI Committee 363 2R-11, "Guide to Quality Control and Assurance of High-Strength Concrete", 2011, American Concrete Institute.
ACI committee 440. XR, "Report on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures" ,2006, American Concrete Institute, Michigan USA, 348.
AlShadidi, R. M. , Hassan, H. F. and Mohammed, M.H., ''Shear Behavior Of High Strength Concrete Beams Reinforced With GFRP Bars And Strengthened By CFRP Sheets'', journal of Engineering and Development, 2016, 20 (1).
Abdulrahman MB, Rashid HM., ''Repairing of Reactive Powder Concrete T-beams Containing Web Opening by CFRP Strips.'', Tikrit journal of Engineering Sciences,2019, 26(1), 9-19.
Abdulrahman MB, Mahmood SM., ''Strength of Reinforced Reactive Powder Concrete Hollow Beams.'', Tikrit journal of Engineering Sciences; 2019, 26(2),15-22.
Spadea, G., Bencardino, F., and Swamy, R. N., ''Structural Behavior of Composite RC Beams with Externally Bonded CFRP'' journal of composite for Construction, 1998, 2 (3).
Aziz ,O.Q. and Yaseen ,S.O., ''Optimum Position of Shear Reinforcement of High-Strength Reinforced Concrete Beams''. Eng. &Tech. journal, 2013, 31, (1).
Zeller, W., "Conclusions from Tests on Corbels", IABSE Colloquium, Structural Concrete, International Association for Bridge and Structural Engineering, Stuttgart, 1991,577-582.
Attiya, M.A.," Behavior Of Reinforced Concrete Corbels Strengthened With Carbon Fibre Reinforced Polymer Strips", PhD thesis, University of Basrah, Iraq ,2012.
Kadhim, M.M.M., "Experimental Investigation Of Reinforced Concrete Corbels Strengthened With CFRP Laminates", M.S.C Thesis, University of Babylon, Iraq, 2015.
Yassin ,L.A.G., "Behavior of RC Corbels Strengthened With CFRP under Monotonic and Repeated Loading ", PhD thesis, ,University of Technology, 2017,
Iraqi standard specifications No.5/1984,"Portland Cement", Central Agency for Standardization and Quality Control, Planning Council, Baghdad, IRAQ,(in Arabic)
Iraqi standard specifications No.45/1984, "Aggregate from Natural Sources for Concrete", Central Agency for Standardization and Quality Control, Planning Council, Baghdad, IRAQ, (in Arabic) .
ASTM C494/C494M-05a, "Standard Specification for Chemical Admixtures for Concrete", ASTM International, West Conshohocken, 2005, 9 .
BS EN 13263-1, "Silica fume for concrete", Part 1 "Definitions, requirements and conformity criteria",2005, Part 2 Conformity evaluation .
ASTM C 1240 – 05 "Standard Specification for Silica Fume Used in Cementations Mixtures",2005, 4,(2).
ASTM A615M-05a, "Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement", ASTM International, West Conshohocken",2003, 7.
Neville, A. M., “Properties of Concrete” Fourth Edition, Prentice Hall, London,2000.
Abdul-Rahman MB, Ali AA, Younus AM., " Effecting of Steel Fibers and Fly Ash on the Properties of Concrete", Tikrit Journal of Engineering Sciences, 2018, 25 (4), 30-36.