Torsional Strength Enhancement of Reinforced SCC Box Beams Using Internal Transverse Steel Bracing Technique

  • Authors

    • Muhammad Hussein Abdallah
    • Ali Hameed Aziz
    2018-11-28
    https://doi.org/10.14419/ijet.v7i4.20.25943
  • Torsion, Strengthening, SCC, Box beam, Steel Bracing.

  • An experimental investigation was conducted, in this paper, to evaluate the torsional strength enhancement of reinforced self-compacting concrete box beams using internal transverse steel bracing technique. Seven beam specimens have dimensions of (2100x300x300mm) for length; width and depth respectively, were poured and tested under pure torsion. Three variables were adopted in the present study; presence or absence of steel bracings, type of steel bracing (X-Type and XW-Type) and a number of steel bracing (1,3 and 5). Accordingly, the tested beams are divided into three groups (based on steel bracing type), the first group consists of one non-strengthened beam specimen (reference), the second group consists of three beams strengthened by X-Type steel bracing; while, the third group consists of three beams strengthened by XW-Type steel bracing. It was found that the ultimate torque moment increased by about (14.4%, 34.3% and 59.2%) for beam specimens containing one, three and five X-Type steel bracing, respectively, in comparison with the reference beam. While, the ultimate torque moment increased by about (21.9%, 41.8% and 71.6%), for beam specimens containing one, three and five XW-Type steel bracing, respectively, in comparison with the reference beam. The paper concludes that the contribution was enhanced using the adopted technique.

     

     

     

  • References

    1. [1] ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318M-14) and Commentary (ACI 318RM-14)â€, American Concrete Institute, Farmington Hills, MI, USA, pp.519.

      [2] Lars J.R., "Plastic behavior of deformable reinforced concrete box sections under eccentric load", Ph.D. Thesis, University of Queensland, (1996).

      [3] MacGregor J. G. & Ghoneim M. G., "Design for torsion", ACI structural journal, Vol. 92, No. 2, (1995), pp. 211-218..

      [4] Khalil A., Etman E., Atta A., & Fayed S., "Torsional strengthening of RC box beams using external prestressing technique", IOSR Journal of mechanical and civil engineering (IOSR-JMCE), Vol. 12, No. 2, (2015), pp. 30-41.

      [5] Ban S. A., Ali H. A., & Israa K. M., "Strengthening of reinforced concrete beams under combined torsion and bending using carbon fiber reinforced polymer stripsâ€, The Iraqi journal for mechanical and material engineering, Vol. 12, No. 4, (2012), pp. 754-769.

      [6] Abeer A. M., Allawi A. A., & Chai H. K., "Theoretical study on torsional strengthening of multi-cell RC box girders", World Academy of Science, Engineering and Technology, International journal of civil science and engineering, Vol. 7, No. 2, (2013), pp. 155-122.

      [7] Prabaghar A. & Kumaran G., "Theoretical study on the behavior of rectangular concrete beams reinforced internally with GFRP reinforcements under pure torsion", International journal of civil and structural engineering, Vol. 2, No. 2, (2011), pp.579-603.

      [8] Ali H. A. & Oday H. H., " Torsional strengthening of prestressed self-compacting concrete box beams using internal transverse concrete diaphragms technique", Journal of engineering and sustainable development, Vol. 21 , No. 5, (2017), pp.129-145.

      [9] Ali H. A. & Oday H. H., "Torsional strength evaluation of reinforced SCC box beams strengthened internally by opened and closed transverse concrete diaphragms", Proceeding of 3rd international conference on buildings, construction and environmental engineering-Egypt, 23-25 October, (2017).

      [10] EFNARC, "Specification and Guidelines for Self-Compacting Concreteâ€, Association House, 99 West Street, Farnham, Surrey GU9 7EN, UK, pp.21, February 2002, Available at (www.efnarc.org).

      [11] ASTM C39-96, "Test Method for Compressive Strength of Cylindrical Concrete Specimens", (ASTM C39-96), American Society for Testing and Materials, (1996).

      [12] BS 1881-116, “Method for Determination of Compressive Strength of Concrete Cubes", British Standards Institute, London, (1983).

      [13] ASTM C496-96, "Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens", (ASTM C496-96), American Society for Testing and Material, (1996).

      [14] ASTM C 469-02, “Standard Test Method for Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compressionâ€, (ASTM C 469-02), American Society for Testing and Material, (2002).

      [15] Ahmed R. H., "Behavior of reactive powder R.C T-section beams with openings for pure torsion", M. Sc. Thesis, Civil Engineering, College of Engineering, Mustansiriyah University, (2016).

  • Downloads

  • How to Cite

    Hussein Abdallah, M., & Hameed Aziz, A. (2018). Torsional Strength Enhancement of Reinforced SCC Box Beams Using Internal Transverse Steel Bracing Technique. International Journal of Engineering & Technology, 7(4.20), 299-306. https://doi.org/10.14419/ijet.v7i4.20.25943