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3. 3) Belarbi, A. and Hsu, T. T. C.: Constitutive laws of Softened concrete in biaxial tension-compression, ACI Structural Journal, Vol. 91, No. 4, pp. 465-474, 1994.
4. 4) Comite Euro-International du Beton: CEB-FIP model code, Lausanne, Switzerland, 1978.
5. 5) Clark, A. P.: Diagonal tension in reinforced concrete beams, ACI Journal, pp. 507-515, 1989.