New Technique to Enhance the Shear Performance of RC Deep Beams Using Mild Steel Plates

  • Abstract
  • Keywords
  • References
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  • Abstract

    This study suggested a new technique to improve a behavior of RC deep beams using mild steel plates as a vertical web reinforcement rather than the conventional rebars. Nine simply supported RC deep beams were tested under the effect of four-point load with a ratio of shear span to an effective depth (a/d) ranged from 0.75 to 1.75 at intervals of 0.5. The test specimens were divided into three groups, each one included three beams. The first group included specimens with conventional vertical web reinforcement. The second and third groups included specimens with mild steel plates as the vertical web reinforcement. The mild steel plates in the second and third groups were configured as strips and sheets, respectively. All the specimens had a length of 1200 mm, a clear span of 900 mm, and a rectangular cross-section of 150 mm wide and of 300 mm depth. The test results confirmed that both of mild steel plate configurations contributed effectively in improving the ultimate load capacity of tested beams, compared with those of conventional shear re-bars, by about (15.4% to 28.26%) and the ductility factor by about (6.06% to 30.56%). Furthermore, specimens with mild steel plates had a low sectional height under tension by about (10.11% to 32.08%).



  • Keywords

    Deep Beams, Steel plates, Stirrups, Reinforced concrete, span to depth ratio.

  • References

      [1] Russo, G.; Zingone, G.; and Puleri, G., “Flexure-Shear Interaction Model for Longitudinally Reinforced Beams,” ACI Structural Journal, Vol. 88, No. 1, Jan.-Feb. 1991, pp: 60-68.

      [2] Russo, G., and Puleri, G., “Stirrup Effectiveness in Reinforced Concrete Beams under Flexure and Shear,” ACI Structural Journal, Vol. 94, No. 3, May-June 1997, pp: 27-238.

      [3] De Paiva, H. A. R., and Siess, C. P., “Strength and Behavior of Deep Beams in Shear,” Journal of the Structural Division, ASCE, Vol. 91, No. ST5, Oct. 1965, pp: 19-41.

      [4] Kong, F. K.; Robins, P. J.; and Cole, D. F., “Web Reinforcement Effects on Deep Beams,” ACI JOURNAL, Proceedings Vol. 67, No. 12, Dec. 1970, pp: 1010-1017.

      [5] Smith, K. N., and Vantsiotis, A. S., “Shear Strength of Deep Beams,” ACI JOURNAL, Proceedings Vol. 79, No. 3, May-June 1982, pp: 201-213.

      [6] ACI Committee 318, 2014, Building Code Requirements for Structural Concrete ACI 318M-14 and commentary, American Concrete Institute, Farmington Hills, 503 pp.

      [7] Yang, K. Chung, H. Lee, E. Eun, H. 2003. “Shear characteristics of high-strength concrete deep beams without shear reinforcements”. Engineering Structures, Vol. 25, No. 10, pp:1343–1352.

      [8] Bakir P. Boduroglu, H. 2005. “Mechanical behaviour and nonlinear analysis of short beams using softened truss and direct strut and tie models”. Engineering Structures, Vol.27, No.4,pp: 639–651.

      [9] Wight, J.K. and J.G. MacGregor, “Reinforced Concrete: Mechanics and Design. ” 6th Edition. 2012: Pearson.

      [10] Clark, A. P. (1951). “Diagonal tension in reinforced concrete beams.” American Concrete Institute Journal, Vol. 48, No. 10, pp: 145-156.

      [11] Tan KH, Lu HY. Shear behavior of large reinforced concrete deep beams and code comparisons. ACI Structural Journal, 1999; Vol. 96, No. 5, pp: 836–45.

      [12] Kong, F. K., Robins, P. J., and Cole, D. F. (1970). “Web reinforcement effects on deep beams.” ACI Journal, Vol. 67, No.12, pp: 1010-1018.

      [13] Huber P, Huber T and Kollegger J. “Investigation of the shear behavior of RC beams on the basis of measured crack kinematics”. Engineering Structures ,2016;Vol.113, No.15, pp:41–58.

      [14] Oh, J., and Shin, S. (2001). “Shear strength of reinforced high-strength concrete deep beams.” ACI Structural Journal, Vol.98, No.2, pp: 164-173.

      [15] Quintero-Febres, C., Parra-Montesinos, G., and Wight, J. K. (2006). “Strength of struts in deep concrete members designed using strut-and-tie method.” ACI Structural Journal, Vol.103,No.4,pp: 577-586.

      [16] Tan, K., Kong, F., Teng, S., and Guan, L. (1995). “High-strength concrete deep beams witheffective span and shear span variations.” ACI Materials Journal, Vol. 92, No4, pp: 395-405.

      [17] Ashour, A. F., Alvarez, L. F., and Toropov, V. V. (2003). “Empirical modelling of shear strength of RC deep beams by genetic programming.” Computers and Structures, Vol. 81, No.5, pp: 331-338.

      [18] Kani, G. N. J., “How Safe Are Our Large Concrete Beams?” ACI .JOURNAL, Proceedings Vol. 64, No. 3, Mar. 1967, pp: 128-142.

      [19] Shioya T, Iguro M, Nojiri Y, Akiayma H, Okada T 1989 “Shear strength of large reinforced concrete beams, fracture mechanics”: Application to concrete, Vol. 118. (Detroit: American Concrete Institute) pp.: 259–279

      [20] Chai, Y., Priestley, M., and Seible, F. (1994). “Analytical model for steel‐jacketed RC circular bridge columns. Journal of Structural Engineering”,Vol .120,No. 8 , 2358–2376.

      [21] Rodriguez, M., and Park, R. (1994). “Seismic load tests on reinforced concrete columns strengthened by jacketin”g. ACI Structural Journal, Vol .91, No.2, pp.: 150–159.

      [22] Zhang, Z., Hsu, C. and Moren, J. (2004) “Shear strengthening of reinforced concrete deep beams using carbon fiber reinforced polymer laminates”. ASCE Journal of Composites for Construction, Vol.8, No.5, pp: 403-414.

      [23] Islam, M., Mansur, M. and Maalej, M. (2005). “Shear strengthening of reinforced concrete deep beams using externally bonded FRP systems”. Cement and Concrete Composites Journal, Vol. 27,No. 3, pp:413-420.

      [24] Asghari, A.A., Tabrizian, Z., Beygi, M.H., Amiri, G.G. and Navayineya, B. (2014). “An experimental study on shear strengthening of RC lightweight deep beams using CFRP”. Journal of Rehabilitation in Civil Engineering, Vol. 2, No. 2, pp: 9-19.

      [25] Khudair, J.A. and Atea, R.S. (2015). “Shear behavior of self-compacting concrete deep beams strengthened with carbon fiber reinforced polymer sheets”. International Journal of Engineering Research & Technology (IJERT), Vol. 4, No. 2,pp: 187-191.

      [26] ASTM A615/A615M-14. Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement. Philadelphia, United States: American Society for Testing and Materials; 2008.

      [27] ASTM-E8M-88A, Standard Test Methods for Tension Testing of Metallic Materials, American Society for Testing and Materials, 2015.

      [28] ASTM, C192/C192M – 07 Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory1, in: Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, 2007, pp:1-8.

      [29] Tan, K. G. And Zhao, H. , 2004, “Strengthening of Openings in One-Way Reinforced-Concrete Slabs Using Carbon Fiber-Reinforced Polymer Systems”, Journal of Composites for construction ,ASCE, Vol. 8, No. 5, pp: 393-402.

      [30] Mohammadhassani A,M., Jumaat, M.Z., Ashour,A. and Jameel,M.( 2011). “Failure modes and serviceability of high strength self-compacting concrete deep beams”. Journal of Engineering Failure Analysis Vol. 18, No.8 , pp:2272–2281.

      [31] Vecchio, F.J., and Collins, M.P. 1986. “The Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear”, ACI Structural Journal, Vol. 83, No.2, pp: 219-231.

      [32] Kani GNJ. “The riddle of shear failure and its solution”. ACI J Proc1964; Vol.61, No. 4, pp: 441–468.

      [33] Choi KK, Park HG, Wight JK. “Unified shear strength model for reinforced concretebeams-Part I: Development”. ACI Structural Journal, 2007; Vol. 104, No. 2 pp: 142.

      [34] Walraven, J.C. (1981). “Fundamental Analysis of Aggregate Interlock.” Journal of the Structural Division, Vol. 107, No. 11, pp: 2245-2270.

      [35] Li WW, Leung CK. “Shear span-depth ratio effect on behavior of RC beam shearstrengthened with full-wrapping FRP strip”. Journal of Composites for Construction ,2015, Vol. 20, No. 3, pp.: 04015067-1 - 04015067-14.

      [36] Spadea G, Bencardino F, Swamy RN (1997) “Strengthening and upgrading structures with bonded CFRP sheets design aspects for structural integrity”. Proceedings of the Third International RILEM Symposium (FRPRC-3): Non-Metallic (FRP) for Concrete Structures, Sapporo, Japan, pp:379-386.




Article ID: 25854
DOI: 10.14419/ijet.v7i4.20.25854

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