Floor Beams Reinforcement Effect on the Spandrel Beams


Authors : Rasha M. Shareef Salman; Anis A. Mohamad Ali; Ammar Y. Tahaa

Volume/Issue : Volume 10 - 2025, Issue 3 - March


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DOI : https://doi.org/10.38124/ijisrt/25mar1861

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Abstract : This paper investigates the effect of steel reinforcement of the floor beams on the analysis results of different floor to spandrel length and depth ratios(lf/ls) (hf/hs). This study investigates the behavior of seven full-scale spandrel- floor beams using nonlinear three-dimensional finite element analysis via ANSYS 14.0. The results reveal that positive reinforcement in the floor beams significantly enhances performance, particularly after cracking, by redistributing internal stresses and allowing torque to transfer back to the floor beams. This interaction leads to increased load-carrying capacity and reduced deflection without altering concrete cross-sections. Ultimately, the findings highlight the importance of reinforcement strategies that satisfy both structural and economic requirements for optimizing spandrel-floor beam assemblies.

Keywords : Spandrel-Floor Beams, Compatibility Torsion, ANSYS 14.0.

References :

  1. American Concrete Institute “Report on Torsion in Structural Concrete, AC1 445.1R-12” reported by ACI-ASCE Committee 445, April 2013.
  2. Rausch, C. H., “Design of Reinforced Concrete in Torsion and Shear”, Technical Journal, Berlin, Germany, pp53.
  3. Lessing, N.N,“ Determination of load-Carrying Capacity of Rectangular Reinforced Concrete Elements  Subjected to Flexure with Torsion”, Concrete and reinforced Concrete Institute Moscow, Russia, Study No.5, March 1959, PP. 5-28. Translated by Portland Cement Association.
  4. Hsu, T. T. C., “Torsion of Structural Concrete Behavior of Reinforced Concrete Rectangular Members”, Torsion of Structural Concrete, ACI Special Publication SP-18, 1968, pp. 261-306.
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  6. Hsu, T.T.C. and Burton, K.T., “ Design of reinforced concrete spandrel beam”, Journal of the structural Division, Proc. of the ASCE, Vol.100, ST 1, January 1974, pp.209-229.
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  10. Jawad, N.A.M. “Strength and Behavior of Reinforced Concrete Spandrel Beam”, M.Sc. Thesis, College of Engineering, University of Basrah,1988.
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  12. Mansure, M. A. and Rangan, B. V., “Torsion in Spandrel Beam”,  Journal of the structural Division , proc. of the ASCE, Vol.104, ST 7, April 1978, pp.1061-1075.
  13. Salman, R. M., Mohamed Ali, A., “Parametric Study of the Behaviour of Reinforced Concrete Spandrel – Floor Beams”, IJERET Journal, Vol.4, Issue 7, August 2015.
  14. American Concrete Institute, “Building Code Requirements for Design of Reinforced Concrete”, a- ACI-318-19.

This paper investigates the effect of steel reinforcement of the floor beams on the analysis results of different floor to spandrel length and depth ratios(lf/ls) (hf/hs). This study investigates the behavior of seven full-scale spandrel- floor beams using nonlinear three-dimensional finite element analysis via ANSYS 14.0. The results reveal that positive reinforcement in the floor beams significantly enhances performance, particularly after cracking, by redistributing internal stresses and allowing torque to transfer back to the floor beams. This interaction leads to increased load-carrying capacity and reduced deflection without altering concrete cross-sections. Ultimately, the findings highlight the importance of reinforcement strategies that satisfy both structural and economic requirements for optimizing spandrel-floor beam assemblies.

Keywords : Spandrel-Floor Beams, Compatibility Torsion, ANSYS 14.0.

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