Stress-Strain Curve of Fibrous Concrete in Compression


Omer Qarani Aziz, & Ramzi B. Abdul-Ahad

College of Engineering, Salahaddin University



Abstract

A simple experimental technique was used to obtain the stress-strain curves of the normal weight concrete containing steel fibers. An analytic expression for the stress-strain relationship of the normal weight fibrous concrete is developed. Equations to predict the ultimate strain and the block stress parameters of the fibrous concrete were developed to reflect experimental results. The analytic expression has four constants, which depend on the properties of both the ascending and descending portion of the stress-strain curve and can be evaluated from the knowledge of the four key points of the curve.

 

Keywords: Concrete, Compression, Fiber, Normal Weight, Stress, Strain.




References

1. Carrasquiuo, L. Nilson, A.H., and Slate,F.O. "Properties of High Strength Concrete Subject to Short- Term Loading" ACI Journal, , May/Jwne I981 , 78, (3 ), 171-178.

2. Wang, P"T Shah S.P and Naamn A.E "Stress-Strain Curves of Normal and Lightweight Concrete in Compression", ACl.Iournal 1978 , 75,(`), 603-611

3. ACI Cornrnittee 544, " State of Art Report on Fiber Reinforced Concrete", ACI Manual, 1996

4. Johanston, C.D "Properties of Steel Fiber Reinforced Mortar and Concrete", Proceeding of Symposium of Fibrous Concrete Held in London, England, 16 April, 1980, Pp.1947.

5. Swarny R.N. " Mechanic of Cement Fiber Reinforced Concrete", Symposium Fiber Concrete, ACI Special Publication, Sp-4, 1974, Pp.1-28.

6. Prakash Desyi And S. Krishnan " Equation for Stress-Strain Curve of Concrete" ACI Journal, 1964 , 61,(3) .345-350

7. Srrith, G.M And Young , L.E " Ultimate Theory in Flexure by Exponential Function" ACI Journal,1955,52, 3, 349-360

8. Chein, Wo-Fah and Carson "Stress-Strain Properties of Random Wire Reinforced Concrete" ACI Journal. Proc., 1971, 68, (12) 933-936

9. Hughes, B.P, and No.L" Fathahi, "Stress-Strain Curves for Fiber Reinforced Concrete in Compression". Cement and Concrete Research, 1977, 7, 2173-184.

10. ASTM 1998, "American Society for Testing and Materials"