Skip to main content
SpringerLink
Log in

Load resistance and failure modes of GFRP composite strengthened hollow core slabs with openings

  • Original Article
  • Published:
Materials and Structures Aims and scope Submit manuscript

Abstract

Precast hollow core slabs are mainly used in buildings as slab elements apart from their usage as bridge decks. Due to various structural or service requirements, openings are provided in these slabs. Provision of openings reduces the strength, stiffness and also change the failure modes of the hollow core slabs. Therefore, it is essential to strengthen the slabs so that the load deformation behaviour and failure mode does not change drastically. The objective of this study is to understand the behaviour of glass fibre reinforced polymer (GFRP) strengthened hollow core slabs with openings by external bonding technique. Ten full scale hollow core slabs with and without openings are tested to evaluate the effect of openings and effectiveness of GFRP strengthening. Shear span to depth ratio (a/d) and location of openings are considered as variables. It was observed that, provision of opening reduced the ultimate strength by about 43 % and GFRP strengthening of this slab restored strength to 87 % of the control specimen. Test results indicate that GFRP strengthening is an effective and cost viable technique for restoring the strength and stiffness of precast prestressed hollow core slabs due to openings.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7

Similar content being viewed by others

References

  1. Agbossou A, Michel L, Lagache M, Hamelin P (2008) Strengthening slabs using externally-bonded strip composites: analysis of concrete covers on the strengthening. Composites B 39:1125–1135. doi:10.1016/j.compositesb.2008.04.002

    Article  Google Scholar 

  2. Al-Rousan R, Issa M, Shabila H (2012) Performance of reinforced concrete slabs strengthened with different types and configurations of CFRP. Composites B 43:510–521. doi:10.1016/j.compositesb.2011.08.050

    Article  Google Scholar 

  3. Barros JAO, Cruz JMS (2001) Strengthening a prestressed concrete slab by epoxy-bonded FRP composites and SFRC overlayer. In: Proceedings of the 7th international conference on inspection, appraisal, repairs and maintenance of buildings and structures, Nottingham Trent University, pp 211–221

  4. Chen C, Li C (2005) Punching shear strength of reinforced concrete slabs strengthened with glass fiber-reinforced polymer laminates. ACI Struct J 102(4):535–542

    Google Scholar 

  5. Michel L, Ferrier E, Agbossou A, Hamelin P (2009) Flexural stiffness modelling of RC slab strengthened by externally bonded FRP. Composites B 40:758–765. doi:10.1016/j.compositesb.2009.07.005

    Article  Google Scholar 

  6. Smith ST, Kim SJ (2009) Strengthening of one-way spanning RC slabs with cutouts using FRP composites. Constr Build Mater 23:1578–1590. doi:10.1016/j.conbuildmat.2008.06.005

    Article  Google Scholar 

  7. Delatte NJ Jr, Fowler DW, McCullough BF, Gräter SF (1998) Investigating performance of bonded concrete overlays. J Perform Constr Facil 12:62–70. doi:10.1061/(ASCE)0887-3828(1998)12:2(62)

    Article  Google Scholar 

  8. Mosallam A, Reda Taha MM, Kim JJ, Nasr A (2012) Strength and ductility of RC slabs strengthened with hybrid high-performance composite retrofit system. Eng Struct 36:70–80. doi:10.1016/j.engstruct.2011.11.022

    Article  Google Scholar 

  9. Elgabbas F, El-Ghandour AA, Abdelrahman AA, El-Dieb AS (2010) Different CFRP strengthening techniques for prestressed hollow core concrete slabs: experimental study and analytical investigation. Compos Struct 92:401–411. doi:10.1016/j.compstruct.2009.08.015

    Article  Google Scholar 

  10. Kreit A, Al-Mahmoud F, Castel A, François R (2011) Repairing corroded RC beam with near-surface mounted CFRP rods. Mater Struct 44:1205–1217. doi:10.1617/s11527-010-9693-6

    Article  Google Scholar 

  11. Chaallal O, Benmokrane B (1996) Fiber-reinforced plastic rebars for concrete applications. Composites B 27:245–252. doi:10.1016/1359-8368(95)00023-2

    Article  Google Scholar 

  12. ACI 440.2R-08 (2008) Guide for the design and construction of externally bonded FRP system for strengthening concrete structures. ACI Committee 440. American Concrete Institute, Farmington Hills

  13. Radik MJ, Erdogmus E, Schafer T (2011) Strengthening two-way reinforced concrete floor slabs using polypropylene fiber reinforcement. J Mater Civ Eng 23:562–571. doi:10.1061/(ASCE)MT.1943-5533.0000206

    Article  Google Scholar 

  14. Al-hafiz AM, Chiad SS, Farhan MS (2013) Flexural strength of reinforced concrete one-way opened slabs with and without strengthening. Aust J Basic Appl Sci 7:642–651

    Google Scholar 

  15. Anil Ö, Kaya N, Arslan O (2013) Strengthening of one way RC slab with opening using CFRP strips. Constr Build Mater 48:883–893. doi:10.1016/j.conbuildmat.2013.07.093

    Article  Google Scholar 

  16. Kumar Sarma PS, Prakash SS (2015) Performance of prestressed hollowcore slabs with and without cutouts. Int J Res Eng Technol 04:443–447. doi:10.15623/ijret.2015.0425066

    Google Scholar 

  17. Pachalla SKS, Prakash SS (2016) Effect of openings on the behavior of PPHCS slabs under low and moderate shear. ACI Struct J (accepted)

  18. Tan KH, Zhao H (2004) Strengthening of openings in one-way reinforced-concrete slabs using carbon fiber-reinforced polymer systems. J Compos Constr 8:393–402. doi:10.1061/(ASCE)1090-0268(2004)8:5(393)

    Article  Google Scholar 

  19. Seliem HM, Seracino R, Sumner EA, Smith ST (2011) Case study on the restoration of flexural capacity of continuous one-way RC slabs with cutouts. J Compos Constr 15:992–998. doi:10.1061/(ASCE)CC.1943-5614.0000232

    Article  Google Scholar 

  20. ACI (American Concrete Institute) (2014) Building code requirements for structural concrete. ACI 318-14, Detroit

  21. Kankeri P, Prakash SS (2016) Experimental evaluation of bonded overlay and NSM GFRP bar strengthening on flexural behavior of precast prestressed hollow core slabs. Eng Struct J 120:49–57

    Article  Google Scholar 

Download references

Acknowledgments

This experimental research was sponsored through Prime Minister (PM) fellowship scheme initiated by confederation of Indian industries (CII) and Department of Science and Technology, India. The authors gratefully acknowledge their generous support. Specimens were cast in casting yard of PRECA India Ltd. Their generous support of materials towards this research is also thankfully acknowledged.

Author information

Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India

    Sameer Kumar Sarma Pachalla & S. Suriya Prakash

Authors
  1. Sameer Kumar Sarma Pachalla
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. S. Suriya Prakash
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to S. Suriya Prakash.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Pachalla, S.K.S., Prakash, S.S. Load resistance and failure modes of GFRP composite strengthened hollow core slabs with openings. Mater Struct 50, 3 (2017). https://doi.org/10.1617/s11527-016-0883-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1617/s11527-016-0883-8

Keywords

Search

Navigation