PERFORMANCE OF CONCRETE SLAB REINFORCED BY CFRP BARS AND STRENGTHENED BY DIFFERENT LAYOUT OF CFRP LAMINATES

Authors

  • Entidhar Najm Abed Civil Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq Author https://orcid.org/0009-0009-3019-6706
  • Mu'taz Kadhim Medhlom Civil Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq Author

DOI:

https://doi.org/10.31272/jeasd.28.1.9

Keywords:

Ductility, Externally strengthened, Finite element, Strengthened concrete slab, Stiffness

Abstract

In recent years, Fiber Reinforced Polymer (FRP) rebar has been adopted to reinforce structural concrete elements such as slabs. FRP strips are also increasingly used to reinforce or strengthen concrete members that require higher carrying capacity or to restore damaged structural elements. Therefore, the reinforcement of concrete structures with this material is increasing but the effect of variables on CFRP-reinforced concrete slabs and externally bonded with CFRP laminates has not been evaluated in detail. This study presents a numerical analysis of the structural performance of concrete slabs reinforced by CFRP bars and strengthened by CFRP laminates using a finite element approach with ANSYS software. Six models with the same geometry (1550x1550x100 mm) were analyzed. Four models were reinforced with CFRP bars and externally strengthened with CFRP laminates, one model was reinforced with CFRP bars without external strength, and one reference model with traditional reinforcing bars (control specimen). Different parameters were adopted, such as amounts of FRP bars and CFRP laminates layout in which some models contained both CFRP bars and CFRP laminates. A uniformly distributed load that was calculated by plastic analysis was applied at the top surface area of each model. The plastic load considers the contribution of the laminated CFRP strips that increased the strength of the slab. Analysis results in the maximum strength carrying capacity in equivalent CFRP bars exhibit higher strength percentages of 5.07% of load capacity but differed in mode of failure than conventional reinforcements control slab.

References

Emmons, P. H. 1992. Concrete repair and maintenance illustrated: problem analysis; Repair Strategy; Techniques. Vol. 28. John Wiley & Sons.

Radomski, W. 2002. Bridge rehabilitation. Imperial College Press. https://doi.org/10.1142/p103.

Wang, X., Zhang, X., Ding, L., Tang, J., and Wu, Z. 2020. Punching shear behavior of two-way coral-reef-sand concrete slab reinforced with BFRP composites. Construction and Building Materials. Vol. 231, p. 117113. https://doi.org/10.1016/j.conbuildmat.2019.117113.

Bakis, C. E., Ganjehlou, A., Kachlakev, D. I., Schupack, M., Balaguru, P., Gee, D. J. and Busel, J. P. 2002. Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. Reported by ACI Committee, 440 (2002).

Meier, U. 1987. Bridge repair with high-performance composite materials. Material und Technik. Vol. 4, pp. 125-128.

Jawdhari, A., Harik, I., and Fam, A. 2018. The behavior of reinforced concrete beams strengthened with CFRP rod panels CRP 195. Structures, Vol. 16, pp. 239–253. https://doi.org/10.1016/j.istruc.2018.09.014.

Naqvi, S. A. 2021. Flexural Strengthening of Two-Way Slabs Using CFRP External Laminates. Doctoral dissertation. The University of Texas at Arlington.

Monir M. Kamal, Mohammed A. Safan, and Alaa A. Bashandy, 2007. Experiments on using fiber-reinforced polymer rebars in one-way concrete slabs. Proceeding of the Fourth ERD6 Conference Faculty of Engineering, Shebin El-Kom Center of Rural Development 23-25 October 2007.

ACI committee 440K. 2000. Standard Test Methods for FRP Rod and Sheet. American Concrete Institute (ACI), Detroit, USA.

ACI committee 440R-96. 1996. State of the Art Report on Fiber Reinforced Polymers (FRP) Reinforcement for Concrete Structures. American Concrete Institute (ACI), Detroit, USA.

Al-Rousan, R. Z., Alhassan, M., and Al-wadi, R. 2020. Nonlinear finite element analysis of full-scale concrete bridge deck slabs reinforced with FRP bars. Structures. Vol. 27, pp. 1820–1831. https://doi.org/10.1016/j.istruc.2020.08.024.

Al-Ghazawi, O., Z. and Al-Rousan, R. 2020. Response of Reinforced Concrete Slabs Strengthened with CFRP. Journal of Engineering Science and Technology Review, Vol. 13, Issue 6, pp. 125–129. https://doi.org/10.25103/jestr.136.17

Abdulridha, A. J., Risan, H. K., and Harba, I. S. 2018. Numerical Analysis of Two-Way RC Slab with a Sawn Up Opening Strengthened by CFRP. International Journal of Civil Engineering and Technology, Vol. 9, Issue 8.

Abd Alrazek, M., Shoeib, A. E., Kadry, M., and Youssef, E. I. E. 2021. Strengthening of RC Flat Slabs with openings Subjected to Flexure by Using NSM Techniques. Al-Azhar University Civil Engineering Research Magazine (CERM). Vol. 43, Issue 2.

Cruz, J. R., Seręga, S., Sena-Cruz, J., Pereira, E., Kwiecień, A., and Zając, B. 2020. Flexural behavior of NSM CFRP laminate strip systems in concrete using stiff and flexible adhesives. Composites Part B: Engineering, 195, 108042. https://doi.org/10.1016/j.compositesb.2020.108042

Assad, M., Hawileh, R., and Abdalla, J. 2022. Finite Element Simulation of FRP-Strengthened Thin RC Slabs. Journal of Composites Science. Vol. 6, Issue 9, p. 263. https://doi.org/10.3390/jcs6090263.

Attallah, I. A. 2022. Finite Element Modelling and Parametric Analysis of High Strength Thin Reinforced Concrete Slabs Strengthened by CFRP Laminates. ERJ. Engineering Research Journal, https://doi.org/10.21608/erjm.2022.161289.1209.

Al-Rousan, R. Z., Alhassan, M., and Al-wadi, R. 2020. Nonlinear finite element analysis of full-scale concrete bridge deck slabs reinforced with FRP bars. Structures. Elsevier, Vol.27, pp.1820–1831. https://doi.org/10.1016/j.istruc.2020.08.024.

Adday, A. A., and Ali, A. S. 2023. The flexural behavior of RC beams contains rubberized pieces and is strengthened with CFRP sheets. Journal of Engineering and Sustainable Development. Vol.27, Issue 4, pp. 460-476. https://doi.org/10.31272/jeasd.27.4.4.

ACI 318M–19, 2019. Building Code Requirements for Reinforced Concrete. ACI Committee 318M, 2019.

ACI 440.1 R-15, 2015. Guide for the Design and Construction of Structural Concrete Reinforced with FRP. ACI committee 440.

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Key Dates

Published

2024-01-01

How to Cite

PERFORMANCE OF CONCRETE SLAB REINFORCED BY CFRP BARS AND STRENGTHENED BY DIFFERENT LAYOUT OF CFRP LAMINATES. (2024). Journal of Engineering and Sustainable Development, 28(1), 121-133. https://doi.org/10.31272/jeasd.28.1.9

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