Effect of Steel Fibers on Reinforced Concrete Opening Corners

  • Neeru Bansal Civil engineering Department, RIMT-MAeC, Mandi Gobindgarh
  • Naveen Kwatra Civil engineering Department, Thapar University Patiala
  • Varinder S Kanwar Chitkara University, solan, HP
Keywords: Opening corners, Joint efficiency, Crimped fibers, Aspect ratio, Volume fraction

Abstract

In the design of reinforced concrete structures, much of the attention is embarked towards calculation of the strength of basic structural elements like beams, columns and slabs. Comparatively lesser emphasis has been laid on the detailing, corresponding strength and behavior of corner joints, especially those subjected to opening moments as in the case of cantilever retaining walls, bridge abutments, channels, rectangular liquid retaining structures, beam column joints under earthquake loads. The detailing of reinforcement should be easier and simpler in order to expedite the construction process. At the same time structural member should satisfy the fundamental requirements of strength expressed in terms of controlled cracking and ductility. The result of a comprehensive experimental programme to evaluate the structure behavior of opening corners having U type detailing; corners reinforced with fibers is presented in this paper. The parameters of investigation are: strength measured in terms of joint efficiency, ductility, and crack control. A substantial increase in post-cracking tensile strength, ductility and crack control can be achieved by adding steel fibers to the concrete. Therefore U type detailing system investigated previously was tested afresh with crimped-type flat steel fibers having aspect ratio of 30 and 50 at different percentage volume fractions of 0.5%, 1.0%, 1.5% and 1.75%. The investigations indicate that in the specimen, there is a 30%-35% gain in efficiency with increase in volume fraction up to a certain limit beyond which there is a drop in mix workability and joint efficiency.

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References

[1] B Singh & S K Kaushik, Investigations on Fibre Reinforced Concrete Opening Corners, Journal of the Institution of engineers (India), Volume 84, 201-209 (2003)
[2] Bsingh and K Kaushik. ‘Investigations on Reinforced Concrete Opening Corners.’ ICI-Asiar. Conference one ecstasy in Concrete, Bangalore, November 20-22, (2000).
[3] Bonacci, J. and Pantazopolou,s. (1993), “Parametric Investigation of Joint Mechanics”, ACI Structural Journal, V.90, No.1, Jan.-Feb., pp.61-71.
[4] I HeNilsson. ‘Reinforced concrete corners and joints subjected to Bending Moment-design of corners and joints in Frames structures.’ Document D7:1973, National Swedish Institute for Building Research, Stockholm, 1973.
[5] H MsAbdul-Wahab and A A M Al-Roubai. ‘strength and Behaviour of steel Fibres Reinforced Concrete Corners under Opening Bending Moment.’ Magazine of Concrete Research, vol 50, no 4, 1998, pp 305-318.
[6] I HeNilsson and Alosberg. ‘Reinforced Concretes Corners and Joints subjected to Bending Moments.’ Proceedings ASCE, Vol 102, no 6, 1976,pp 1229-1253.
[7] Is1786-1985. ‘specification for Cold worked steel High strength Deformed Bar for Concrete Reinforcement.’ Bureau of Indian Standards, New Delhi.
[8] Is456:1978. ‘Indian standard Code of Practice for Plain and Reinforced Concrete.’ Bureau of Indian Standards, New Delhi.
[9] Ibrahim, O.T. &luxmoore, A.R.(1986), “Control of Cracks in Reinforced Concrete using steel Fibres”, RIleMsymposium-FRC-86, Volume 2, Paper No. 8.1, July
[10] Jindal, R. and Sharma, V. (1987), “Behaviour of Steel Fibre Reinforced Concrete Knee-Type Beam-Column Connections”, ACI s P105-26, American Concrete Institute, Detroit, pp. 475-491.
[11] Johansson, M. (2000), “Non-linear Finite element Analysis of Concrete Frame Corners”, Journal of structural engineering, ASCE, V.126, No.2, February, pp.190-199.
[12] R Park and T Paulay. ‘Reinforced Concrete structures.’ John Wiley and Sons, New York, 1975, pp 720-724.
Published
2013-12-25
How to Cite
Neeru Bansal, Naveen Kwatra, & Varinder S Kanwar. (2013). Effect of Steel Fibers on Reinforced Concrete Opening Corners. Journal on Today’s Ideas - Tomorrow’s Technologies, 1(2), 113-122. https://doi.org/10.15415/jotitt.2013.12008
Section
Articles