Modelling of Bonded Post-Tensioned Concrete Cantilever Beams under Flexural Loading
Prestressing is widely used technic all over the world for constructions of buildings, bridges, towers, offshore structures etc. due to its efficiency and economy for achieving requirements of long span with small depth. It is used for flexural strengthening of reinforced concrete structures for improving cracking loads and decreasing deflections due to service loads. There are two methods for prestressing (pre-tensioning and post-tensioning). In this paper, a three-dimensional nonlinear Finite Element (FE) method is used to determine the behaviour of Post-Tensioned (PT) concrete cantilever beams with different tendon profiles. Numerical analyses ANSYS package program is used for analysis of beams. The results from FE analysis is verified by experimental reference test result and good agreement is achieved. This paper is focused on the effect of different tendon profiles on the flexural behaviour of Bonded Post Tensioned (BPT) reinforced concrete cantilever beams. Six models with different tendon profiles are investigated. These models are without tendons, two tendons at the bottom, middle, top, parabolic tendons with one draped point and two draped points. Failure loads, deflections, and load versus deflection relationships for all models are examined and it is seen that the beam with one draped tendon profile shows a highest performance.
Nawy, Edward G. Prestressed concrete. Pearson Education, 5th edition. New Jersey: Prentice Hall. 2011.
Allouche, E. N., Campbell, T. I., Green, M. F., and Soudki, K. A., Tendon stressed in continuous unbonded prestressed concrete members, PCI journal, 1999, 44(1), 60-73.
Ozkul, O., A new methodology for the analysis of concrete beams prestressed with unbonded tendons, (2007), ProQuest.
Hoyer, E. a., Contribution towards the Question of Bond Strength, in Beton und Eisen, Berlin, 1939, 38(6), 107-110.
Nusrath F.RP, Satheesh V.SP, Manigandan.MP, and Suresh Babu.SP. An Overview on Tendon Layout for Prestressed Concrete, Journal of Innovative Science, Engineering and Technology, 2015, 2(9), 944-949.
Hussien, O. F., Elafandy, T. H. K., Abdelrahman, A. A., Baky, S. A., and Nasr, E. A., Behavior of bonded and unbonded prestressed normal and high strength concrete beams, HBRC Journal, (2015). 8(3), 239-251.
Yapar, O., Basu, P. K., and Nordendale, N. Accurate finite element modeling of pretensioned prestressed concrete beams, Engineering Structures, (2015). 101, 163-178.
Au, FTK, Du JS, and Cheung, YK. Service load behavior of unbonded partially prestressed concrete members, Magazine of Concrete Research, (2005). 57(4), 199-209.
Harajli, M. H., and Kanj, M. Y. Service load behavior of concrete members prestressed with unbonded tendons, Journal of structural engineering, 118(9), (1992). 2569-2589.
Ozkul, O., Nassif, H., Tanchan, P., and Harajli, M. Rational approach for predicting stress in beams with unbonded tendons, ACI Structural Journal, (2008). 105(3), 338.
Dahmani, L., Khennane, A., and Kaci, S. Crack identification in reinforced concrete beams using ANSYS software, Strength of materials, (2010). 42(2), 232-240.
ANSYS, (2011). ANSYS Help.
Desayi, P., and Krishnan, S., “Equation for the Stress-Strain Curve of Concrete”. Journal of the American Concrete Institute, (1964), 61, 345- 350.
Willam, K., and Warnke, E., Constitutive model for the triaxial behavior of concrete, International Association for Bridge and Structural Engineering, (1975). 19, ISMES.
European Committee for Standardization (CEB), Eurocode 3, “Design of Steel Structures”. Part 1.1: General Rules and Rules for Buildings, DD ENV, (1993), 1-1, EC3.
Izzet, A. F. Effect of High Temperature on the Strain Behavior in Post-Tensioning Concrete Beams by Using Finite Element Method (ANSYS Program), Journal of Civil Engineering Research, (2016). 6(2), 40-46.
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