Ductility Ratio and Toughness Index of Reinforced Concrete Slabs Subjected to High Temperature


Ahmed Heidayet M., & Omer Qarani

College of Engineering, Salahaddin University





Abstract

Ductility ratio and toughness index were studied for two -way reinforced concrete slabs subjected to high temperature and cooling. . Empirical equations were developed to predict the ductility ratio and toughness index ( in terms of temperature and reinforced ratio) of such slabs under uniformly distributed load . These proposed equation gave good agreement when compared with the experimental results, with a correlation factor for ductility ratio and toughness index of 0.94 and 0.95 ,respectively.


Keywords: - slabs, ductility ratio, toughness index, high temperature, two-way slob, ductility, reinforced concrete.



References

1- Sharpe, R.l., “ The Earthquake Problem”, ACI-Special Publication, SP - 53, Detroit, 1977, 25-46.

2- Zoldners, N.G., “ Thermal Properties of Concrete Under Sustain Elevated Tempreature, “ ACI-Special Publication, SP-25, Detroit, 1971, 1 -31.

3- Fahmi, H.M., and Nuri, D.,”Influence of High Temperatures on Compressive and Tensile Strengths of Concrete,” Journal of Buliding Research, Bulding Research, Centre, Council for Scientific Research, Baghdad, Nov.1988,5(2), 85-99.

4- Edwards, W.T., and Gamble, N.L., “ Strength of Grade 60 Reinforcing Bars after Exposure to Fire Temperatuers, “ Concrete International, Oct. 1986, 8(10), 17-19.

5- Khoury, G.A., Grainger, B. N., and Sulliran, P.J., “ Strain of Concrete During First Heating ot 600 C under load, “ <agazine of Concrete Research ( Cement and Concrete Association), Dec. 1985, 37 (133), 195 - 2015.

6- Nizamuddin, Z., and Bresler, B., “ Fire Response of Reinforced Concrete Slabs.

“ Journal of the Structural Division, ASCE, Aug. 1979, 105(ST8), 1653 - 1671.

7- Lie, T. T., and Leir, O.W., “Factors Affecting Temperature of Fire - Exposed Concrete Slabs, “ Fire and <aterials , 1979,3 (2), 74-79.

8- Shirley, S.T., Burg, R.G., and Fiorate, A.E., “ Fire Endurance of high -Strength Concrete Slabs, “ ACO Materials Journal, <arch - April 1988, 85, (2), 102 - 108

9- Elingwood, B.R., “ Impact of Fire Exposure on heat Transmission in Concrete Slabs, “ Journal of Strucural Engineering , June, 1991, 117(6), 1870-1875.

10- Tassios, T.P., and Chronopoulos, M.P., “ Structural Response of R.C. Elements under Fire, “ The Structural Engineer, Aug. 1991, 69(15), 227 - 280.

11- Park, R., and Paulay , T., Reinforced Concrete Structures, 1st edition, Wiley-Intersience Publication , John Wiley and Sons, New York, 1975, 195-269.

12- Singer, F. L., and Pytal, A., Strength of Materials, 1980, 3rd edition , Harper and Row Publishers, New York, 510-569/

13- Al-Dalawi, A. H., “ Behaviour of Reinforced Concrete Slabs Subjected to high Temperature, “ <.Sc. Thesis, University of Technology, baghdad. 1993.