Finite Element Modeling of Post-Tensioned Two-Way Concrete Slabs under Flexural Loading

Khattab Saleem Abdul-Razzaq, Abbas Haraj Mohammed, Taha Khalid Mohammedali

Abstract


Post-Tensioned (PT) method is a widely used technique to prevent cracking and to minimize the deflection which is resulted by loads. In this method, stress is applied after concrete placing and reach adequate hardening and strength. This paper investigates the structural behaviour of PT two-way concrete slabs. The main objective of this study involves a detailed flexural behavior analytical investigation of PT concrete two-way slab with the different bonded tendon layout. This will be achieved by non-linear Finite Element (FE) analysis programs method, to choose the most effective and optimum position of tendon layout with different number of tendons and applied load on the concrete two-way slab. A parametric study was conducted to investigate the effect of tendons layout on the overall behavior of post-tensioned two-way concrete slab. The result obtained from finite element analysis showed that the failure load in PT in both directions increased about 89 % as compared with slab PT in one direction.


Keywords


Bonded Tendon; Post Tensioned Concrete; Two-Way Slab; Nonlinear; Finite Element; Computer Modelling.

References


Naaman, A. E. and Alkhairi, F. M. “Stress at Ultimate in Unbonded Post-Tensioning Tendons: Part 1--Evaluation of the State of the Art”. Structural Journal (September 1991), 88(5), 641-651. doi:10.14359/2763.

Kim, M. S. and Lee, Y. H. “Flexural Behavior of Posttensioned Flat Plates Depending on Tendon Layout”. Advances in Materials Science and Engineering (2016), pp. 1-11. doi:10.1155/2016/2651435.

Williams, M. S. and Waldron, P. “Movement of Unbonded Post-Tensioning Tendons during Demolition”, Proceedings of the Institution of Civil Engineers (1989), Part 2, Vol. 87, pp. 225-253. doi:10.1680/iicep.1989.2005.

Yang, K. H., Mun, J. H. and Kim, G. H. “Flexural Behavior of Post-Tensioned Normal-Strength Lightweight Concrete One-Way Slabs”, Engineering Structures (November 2013), 56, 1295-1307. Doi:10.1016/j.engstruct.2013.07.004.

Ranzi, G., Al-Deen, S., Ambrogi, L. and Uym, B. “Long-Term Behaviour of Simply-Supported Post-Tensioned Composite Slabs”, Journal of Constructional Steel Research (September 2013), 88, 172-180. Doi:10.1016/j.jcsr.2013.05.010

Bailey, C. G. and Ellobody, E. “Fire Tests on Unbonded Post-Tensioned One-Way Concrete Slabs”, Magazine of Concrete Research (February 2009), 6, 67-76. doi:10.1680/macr.2008.00005

Bailey, C. G. and Ellobody, E. “Fire Tests on Bonded Post-Tensioned Concrete Slabs”, Engineering Structures ( March 2009), 31, 686-696. doi:10.1016/j.engstruct.2008.11.009

El Semelawy, M. N. “Design of Prestressed Concrete Flat Slab using Modern Heuristic Optimization Techniques”. Expert Systems with Applications ( April 2012), 39(5), 5758-5766. doi:10.1016/j.eswa.2011.11.093

Ellobody, E. and Bailey, C. G. “Modelling of Unbonded Post-Tensioned Concrete Slabs under Fire Conditions”, Fire Safety Journal (February 2009), 44, 159-167. doi:10.1016/j.firesaf.2008.05.007.

Kang, T. and Huang, Y. “Computer Modeling of Post-Tensioned Structures”. 4th International Conference on Computer Modeling and Simulation. 22 (2012) , pp. 41-45. Singapore: ICCMS 2012.

Panfilov, D. A. “The Analysis of Slab and Beam Floor with Pre-Stressed Wire Rope Reinforcement”. Procedia Engineering (2015), 111, 626-631. doi:10.1016/j.proeng.2015.07.057.

Lou, T., Lopes, S. M., and Lopes, A. V. “Response of Continuous Concrete Beams Internally Prestressed with Unbonded FRP and Steel Tendons”. Composite Structures (October 2016), 154, 92-105. doi:10.1016/j.compstruct.2016.07.028

Mohammed, A. M. and Tayşi, N. “Modelling of Bonded and Unbonded Post-Tensioned Concrete Flat Slabs under Flexural and Thermal Loading”, Structural Engineering and Mechanics (June 2017), Vol. 62, No. 5 , 595-606. doi: 10.12989/sem.2017.62.5.595.

Mohammed, A. M., Abdul-Razzaq, K. S., Tayşi, N. and FAQE, A. H. “Modelling of Bonded Post-Tensioned Concrete Cantilever Beams under Flexural Loading”, Civil Engineering Journal (July 2017), Vol. 3, No. 7, 463-479.

ANSYS, "ANSYS Help," 2011.

Desayi, P., and Krishnan, S.,“Equation for the Stress-Strain Curve of Concrete”. Journal of the American Concrete Institute, 61 (1964), 345- 350. doi: 10.14359/7785.

European Committee for Standardization (CEB), Eurocode 3 “Design of Steel Structures”. Part 1.1: General Rules and Rules for Buildings (1993), DD ENV, 1-1, EC3.


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DOI: 10.28991/cej-030964

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Copyright (c) 2018 Abbas Mohammed, Khattab Abdul-Razzaq

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