FRC – A New Sustainable Option for Construction to Mitigate Earthquakes

Ten simply supported grossly underreinforced tapered concrete beams of full size were tested upto complete collapse under flexural effect .Out of 10 beams, 5 beams were nonfibrous and the remaining beams contained fibres. The beams had a variation in the tapered angle as 2°, 4°, 6°, 8° and 10°. The concrete mix, conventional steel and the type of fibre used were held constant. Flat corrugated steel fibres were utilized as secondary reinforcement. The strength and stability parameters were measured. It is established that the fibrous tapered beams can be used economically in earthquake prone areas.

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References:
[1] Romauldi, T P and Batson, C B., "Behaviour of Reinforced Cement
Concrete Beams with Closely - Spaced Reinforcement," J. of
American Concrete Institute, Vol.6, pp. 775-789., June. 1963.
[2] Swamy, R.N. and Mangat, P.S., " The Onset of Cracking and Ductility
of Steel Fibre Concrete," Cement and Concrete Research, Vol.5, No.1,
pp.37-53, Jan.1975.
[3] Sasturkar, P J. , "Ductile Performance of SFRC Beams," Proceedings
of the International Conference on Civil Engineering-Indian Institute
of Science, Bangalore, Vol.2, July. 2001, pp. 102-108.
[4] Kaushik, S. K. and Sasturkar, P J., "Simply Supported Steel Fibre
Reinforced Concrete Beams Under Combined Torsion, Bending and
Shear," Proceedings of the International Conference on Recent
Developments in Fibre Reinforced Cements and Concretes, London
and New York-Elsevier Applied Science Publications, Sept. 1989, pp.
687-698.
[5] Liang, R Y and Galvez, E., "High Strength, High Denier Discrete
Polymer Fibre in Cementitious Composites," Proceedings of the First
Materials Engineering Congress, Denver, Newyork, Vol.2, Aug. 1990,
pp. 894-902.
[6] Johnston, C. D. and Gray, R. J., "Flexural Toughness and First-Crack
Strength of Fibre Reinforced Concrete Using ASTM Standard C1018,"
RILEM Symposium, FRC-86, Vol.1, July.1986, Paper Number: 5.1
[7] Balaguru, P N, Narahari, R and Patel, M., "Flexural Toughness of
Steel Fibre Reinforced Concrete," J. of American Concrete Institute
Materials, Vol.89, No.6, , pp. 541-545, Nov-Dec.1992 .
[8] Ramakrishnan, V and Lokvik, B J., "Flexural Fatigue Strength of Fibre
Reinforced Concretes,". Proceedings of the International Workshop
held by RILEM, ACI and others, Mainz, Germany, Vol.15, June.1991,
pp. 271-287.
[9] Nagaraj, T.S. and Dwarakanath, H. V., "Structural Response of
Partially Fibrous Concrete Beams," J. of ASCE of Structural Division,
Vol. 110. No. 11, , pp.2798-2812. Nov.1984.
[10] Fatih, A., Tefaruk, H. and Kamuran., "A. Experimental Investigation
of Steel Fibre Reinforced Concrete Box Beams under Bending," J. of
Materials and Structures, Vol.39, No.4, , pp. 459-467 June.2006.
[11] Thandavamoorthy, T. S., "Static and Fatigue of High Ductility Bars
Reinforced Concrete Beams," J. of Materials in Civil Engineering,
Vol. 1, pp. 41-50, Feb.1999.
[12] Thandavamoorthy, T. S., "R.C.C. Beams with High Ductility Ribbed
Bars- Behaviour under Monotonic Loading," Indian Concrete
Journal, Vol. 4, pp. 282 - 285, April.2001.
[13] Ramesh, Jayasimha Pattar, Narasimha Rao and Santhosh
"Performance of Grossly Underreinforced Tapered Beams Partially
Reinforced with Flat Steel Fibres (Part-IIΙ)," B.E.-Project work
submitted to Visveswaraya Technological University, Belgaum
(Karnataka) -India, June.2006.
[14] IS: 456-2000. , "Indian Standard Code of Practice for Plain and
Reinforced Concrete," Bureau of Indian Standards, New Delhi, Clause
23.2, 2000, pp 37.
[15] Jenq, Y. S. and Shah, S P., "Crack Propagation in Fibre Reinforced
Concrete," J. of Structural Engineering, Vol.112, No.1, pp. 15-25,
Jan.,1986.
[16] Sasturkar, P. J. And Giriraj, S., "Fibrous Concrete-An Economical
Mitigation of Earthquake Resistant Design for Construction of Roof
Beams," Proceedings of the International Conference on Disasters
and Mitigation. Madras, Vol.1, Jan.,1996, pp.A3.33-A3.39.
[17] Sasturkar, P. J., "SRFC-A Measure to Mitigate Earthquakes,"
Proceedings of the International Conference on Disaster Management.
Guwahati, April., 1998, pp. 621-627.
[18] Sasturkar, P. J., Patil, A S. and Mujawar, S. S., "Performance of
Grossly Underreinforced Tapered Beams Partially Reinforced with
Ultra Duracem Polypropylene Fibres," Proceedings of the Structural
Engineering Convention-An International Meet, Indian Institute of
Science, Bangalore, Dec.,2005.
[19] Sasturkar, P J. and Gani, "A. FRC-A New Construction Material to
Mitigate Earthquakes," Proceedings of the International Conference
on Earthquake Engineering, School of Civil Engineering, SASTRA,
Deemed University, Thanjavur, Feb.,2006, pp. 591-596.
[20] Sasturkar, P. J., Kulkarni, H. V. and Preeti,P., "Performance of FRC :
A New Sustainable Option for Construction," Proceedings of the 7th
International Congress on Concrete : Constructions-s Sustainable
Option, University of Dundee , Dundee , Scotland (UK) , July 2008,
pp.365-372.