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Numerical Assessment of Slab–Column Connection Additionally Reinforced with Steel and CFRP Bars

  • A. HamodaEmail author
  • K. M. A. Hossain
Research Article - Civil Engineering
  • 32 Downloads

Abstract

This paper investigates behavior of reinforced concrete (RC) slab–column connection additionally reinforced with punching-shear steel or carbon fiber reinforced polymer (CFRP) bars. Such connection is commonly used in RC flat slab system. However, the absence of supporting beam results in three-dimensional shear stresses with higher hogging moment acting over RC columns which may present internal inclined cracks gradually propagating toward compressive zone leading to sudden brittle punching-shear failure. This research proposes using of steel/CFRP bars intersecting the expected inclined cracks to provide better contribution to punching-shear carrying capacity and obtain ductile failure mode. Nonlinear three-dimensional finite element (FE) analysis was created and validated through simulating the behavior of experimental specimens (with or without steel/CFRP punching-shear reinforcement) tested under static loading to failure. Moreover, further validation was conducted against previous experimental work. Such FE model was employed for parametric study on three groups of slab–column connections with variable parameters: bar type (steel/CFRP), shape and position of additional punching-shear reinforcement. Slab–column connections with additional punching-shear reinforcements showed enhanced performance in terms of higher cracking load, higher pre-cracking elastic stiffness, higher ultimate deflection reflecting ductile failure mode and higher strength.

Keywords

Punching-shear capacity Slab–column system Additional punching-shear reinforcement Finite element simulation Crack pattern Concrete damage plasticity model 

Notes

Acknowledgements

Acknowledgment also goes to research staffs at Ryerson University, Canada, for their technical information. Technical helpers provided by various Egyptians industries are acknowledged. The authors also acknowledge the contributions of technical staff members in Kafrelsheikh University, Egypt, for providing great assistance and helpful comments. This research has been funded by the first author.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

The authors declare that there is no issue concerning ethical standards.

References

  1. 1.
    Eom, T.S.; Song, J.W.; Song, J.K.; Kang, G.S.; Yoon, J.K.; Kang, S.M.: Punching-shear behavior of slabs with bar truss shear reinforcement on rectangular columns. Eng. Struct. 134, 390–399 (2017)CrossRefGoogle Scholar
  2. 2.
    Nguyen, T.N.; Nguyen, T.T.; Pansuk, W.: Experimental study of the punching-shear behavior of high performance steel fiber reinforced concrete slabs considering casting directions. Eng. Struct. 131, 564–573 (2017)CrossRefGoogle Scholar
  3. 3.
    Caldentey, A.P.; Lavaselli, P.P.; Peiretti, H.C.; Fernández, F.A.: Influence of stirrup detailing on punching-shear strength of flat slabs. Eng. Struct. 49, 855–865 (2013)CrossRefGoogle Scholar
  4. 4.
    Ramos, A.P.; Lúcio, V.J.; Faria, D.M.: The effect of the vertical component of prestress forces on the punching strength of flat slabs. Eng. Struct. 76, 90–98 (2014)CrossRefGoogle Scholar
  5. 5.
    Meisami, M.H.; Mostofinejad, D.; Nakamura, H.: Strengthening of flat slabs with FRP fan for punching-shear. Compos. Struct. 119, 305–314 (2015)CrossRefGoogle Scholar
  6. 6.
    Hamoda, A.; Hossain, K.M.A.; Sennah, K.; Shoukry, M.; Mahmoud, Z.: Behaviour of composite high performance concrete slab on steel I-beams subjected to static hogging moment. Eng. Struct. 140, 51–65 (2017)CrossRefGoogle Scholar
  7. 7.
    Hossain, K.M.A.; Hamoda, A.A.; Sennah, K.; Shoukry, M.E.; Mahmoud, Z.I.: Bond strength of Ribbed GFRP bars embedded in high performance fiber reinforced concrete. J. Multidiscip. Eng. Sci. Technol. 2(6), 1260–1267 (2015)Google Scholar
  8. 8.
    Genikomsou, A.S.; Polak, M.A.: Finite element analysis of punching-shear of concrete slabs using damaged plasticity model in ABAQUS. Eng. Struct. 98, 38–48 (2015)CrossRefGoogle Scholar
  9. 9.
    Genikomsou, A.S.; Polak, M.A.: 3D finite element investigation of the compressive membrane action effect in reinforced concrete flat slabs. Eng. Struct. 136, 233–244 (2017)CrossRefGoogle Scholar
  10. 10.
    Wosatko, A.; Pamin, J.; Polak, M.A.: Application of damage–plasticity models in finite element analysis of punching-shear. Comput. Struct. 151, 73–85 (2015)CrossRefGoogle Scholar
  11. 11.
    Bompa, D.V.; Elghazouli, A.Y.: Numerical modelling and parametric assessment of hybrid flat slabs with steel shear heads. Eng. Struct. 142, 67–83 (2017)CrossRefGoogle Scholar
  12. 12.
    Hassan, M.; Ahmed, E.A.; Benmokrane, B.: Punching-shear design equation for two-way concrete slabs reinforced with FRP bars and stirrups. Constr. Build. Mater. 66, 522–532 (2014)CrossRefGoogle Scholar
  13. 13.
    Meisami, M.H.; Mostofinejad, D.; Nakamura, H.: Punching-shear strengthening of two-way flat slabs using CFRP rods. Compos. Struct. 99, 112–122 (2013)CrossRefGoogle Scholar
  14. 14.
    ABAQUS/CAE.: Finite Element Analysis Program Version 6.14-3 (2014)Google Scholar
  15. 15.
    Lubliner, J.; Oliver, J.; Oller, S.; Onate, E.: A plastic-damage model for concrete. Int. J. Solids Struct. 25(3), 299–326 (1989)CrossRefGoogle Scholar
  16. 16.
    Fukui Fiber-tech, Co. Ltd.: Toyohashi Japan. Carbon Fiber Reinforced Polymers Reinforcing Bars Data Sheet (2005).Google Scholar
  17. 17.
    Lee, J.; Fenves, G.L.: Plastic-damage model for cyclic loading of concrete structures. J. Eng. Mech. ASCE 124(8), 892–900 (1998)CrossRefGoogle Scholar
  18. 18.
    Schickert, G., Winkler, H.: Results of test concerning strength and strain of concrete subjected to multi-axial compressive stress. Ger. Commun. Reinf. Concr. 277, 123 (1977)Google Scholar
  19. 19.
    Richart, F.E.; Brandtzaeg, A.; Brown, R.L.: A Study of the Failure of Concrete Under Combined Compressive Stresses. University of Illinois at Urbana, Champaign, College of Engineering. Engineering Experiment Station, Bulletin 185, Champaign (1928)Google Scholar
  20. 20.
    Carreira, D.J.; Chu, K.H.: Stress–strain relationship for plain concrete in compression. ACI J. 82(6), 797–804 (1985)Google Scholar
  21. 21.
    Abrishambaf, A.; Barros, J.A.; Cunha, V.M.: Tensile stress–crack width law for steel fibre reinforced self-compacting concrete obtained from indirect (splitting) tensile tests. Cement Concr. Compos. 57, 153–165 (2015)CrossRefGoogle Scholar
  22. 22.
    Mills, L.L.; Zimmerman, R.M.: Compressive strength of plain concrete under multiaxial loading conditions. ACI J. 67(10), 802–807 (1970)Google Scholar

Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Civil Engineering Department, Faculty of EngineeringKafrelsheikh UniversityKafrelsheikhEgypt
  2. 2.Civil Engineering DepartmentRyerson UniversityTorontoCanada

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