Flexural Strengthening of Deficient Reinforced Concrete Beams with Post-Tensioned Carbon Composites Using Finite Element Modelling

Document Type : Regular Paper

Authors

1 Ph.D. Candidate of Structural Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran

2 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

Abstract

The application of external post-tensioned steel bars as an effective way to strengthen an existing bridge has been so far used in many different countries. In recent decades, however, they have been replaced by bars made from Carbon Fiber Reinforced Polymer (CFRP), as a material with high tensile strength and corrosion resistance, to address several concerns with steel bars such as their application costs and difficulties, and also their durability.  Post-tensioning these sheets can be a new efficient method in strengthening the beams and utilizing the high strength of these material.This study has focused on the flexural behavior of beams reinforced by Post-tensioned non-bonded CFRP sheets. 15 beams were categorized in 3 groups of 5m-, 10m-, and 15m-span in order to evaluate the effect of some parameters such as level of post-tensioning, sheet length, and beam span on its load capacity, failure mode, ductility, and cracks behavior. The results indicate that even though the increase in post-tensioning levels improves the effectiveness of the method, but this capacity improvement is much more for small span beams especially when CFRP sheets are 90% of the beam span, compared to long span beams. There has been a noticeable capacity increase around 50% in the beams when decreasing the sheet length from 90% to 45% of the beam span and also causing 11-14% increase in ductility in various conditions.

Keywords

Main Subjects

References

[1].  Kadhim, A. M., Numan, H. A., & Özakça, M. (2019). Flexural Strengthening and Rehabilitation of Reinforced Concrete Beam Using BFRP Composites: Finite Element Approach. Advances in Civil Engineering, 2019. 
[2]. Marthong, C. (2019). Rehabilitation of exterior RC beam-column connections using epoxy resin injection and galvanized steel wire mesh. Earthquakes and Structures, 16(3), 253-263.
[3]. Mustafa, S. A., & Hassan, H. A. (2018). Behavior of concrete beams reinforced with hybrid steel and FRP composites. HBRC journal, 14(3), 300-308.
[4]. Delgado, P., & Kappos, A. (2018). Strengthening of RC Bridges. In Strengthening and Retrofitting of Existing Structures (pp. 199-215). Springer, Singapore.
[5]. Yang, J., Haghani, R., & Al-Emrani, M. (2018, July). Flexural FRP Strengthening of Concrete Bridges Using an Innovative Concept. In Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges: Proceedings of the Ninth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2018), 9-13 July 2018, Melbourne, Australia (p. 339). CRC Press.
[6]. Zhang, H. Y., Yan, J., Kodur, V., & Cao, L. (2019). Mechanical behavior of concrete beams shear strengthened with textile reinforced geopolymer mortar. Engineering Structures, 196, 109348.
[7]. Sharif, A., Al-Sulaimani, G.J., Basunbul, I.A., Baluch, M.H. and Ghaleb, B.N. (1994) “Strengthening of initially loaded reinforced concrete beams using FRP plates” ACI Structural Journal, Vol. 91, No.2, pp. 160-168.
[8].  Quantrill RJ.; Hollaway LC.; “The Flexural Rehabilitation of Reinforced Concrete Beams by the use of Pre-stressed advanced Composite Plates”, Compos Sci Technol1998 , 58(8):1259–75.
[9]. Wang X.; Zhou Ch.; “Calculation of Flexural Strength of RC Beams Strengthened with Bonded Pre-stressed FRP Laminates”, 38(8):1359–61.
[10].                Bastani, A., Das, S., & Kenno, S. Y. (2019). Flexural rehabilitation of steel beam with CFRP and BFRP fabrics–A comparative study. Archives of Civil and Mechanical Engineering, 19(3), 871-882.
[11].                Choobbor, S. S., Hawileh, R. A., Abu-Obeidah, A., & Abdalla, J. A. (2019). Performance of hybrid carbon and basalt FRP sheets in strengthening concrete beams in flexure. Composite Structures, 227, 111337.
[12].                Siddika, A., Al Mamun, M. A., Alyousef, R., & Amran, Y. M. (2019). Strengthening of reinforced concrete beams by using fiber-reinforced polymer composites: A review. Journal of Building Engineering, 100798.
[13].                Lee, H., Jung, W. T., & Chung, W. (2019). Post-tension near-surface mounted strengthening system for reinforced concrete beams with changes in concrete condition. Composites Part B: Engineering, 161, 514-529.
[14].                Gil, L., Bernat-Masó, E., & Escrig, C. (2019). Experimental and analytical flexural performances of reinforced concrete beams strengthened with post-tensioned near surface mounted basalt composite laminates. Composites Part B: Engineering, 157, 47-57.
[15].                ACE Consulting Engineers, Brisbane, Australia. “Strength and ductility of FRP web-bonded RC beams for the assessment of retrofitted beam–column joints”, Journal of Composite Structures 92, 2010.
[16].                ACI Committee 440. “Guide for the Design and Construction of Concrete Reinforced with FRP Bars”, ACI440.1R-03, American Concrete Institute, USA, 2001.
[17].                Canadian Standards Association, S806-02.  Design and Construction of Building Components with Fiber-Reinforced Polymers. CSA, Rexdale Ontario, May 2002.
[18].                Japanese Society of Civil Engineers (JSCE). (1997). “Recommendation for Design and Construction of Concrete Structures Using Continuous Fiber Reinforcing Materials.” Concrete Engineering Series 23.Tokyo.
[19].                ISIS Canada Design Manuals, 2001, “Strengthening Reinforced Concrete Structures with Externally-Bonded Fiber Reinforced Polymers,” The Canadian Network of Centers of Excellence on Intelligent Sensing for Innovative Structures, Winnipeg, MB, Canada, 86 pp.
[20].                ANSYS User’s Manual Version 10.0. Houston: Swanson Analysis Systems Inc, 2006.
[21].                Yang D.S.; Park S.K; Neale K.W.; “Flexural behavior of reinforced concrete beams strengthened with pre-stressed carbon composites”, Composite Structure.
[22].                Iranian National Building Codes Compilation Office. Iranian National Building Code, Part 9: Reinforced Concrete Buildings Design, Ministry of Housing and Urban Development (MHUD), 2014.

Files

Cited by

History

  • Receive Date: 24 August 2018
  • Revise Date: 28 April 2020
  • Accept Date: 23 May 2020

Share

How to cite

Statistics