ctm ≔ 3.02 MPa : mean value of the tensile strength of the concrete (Eurocode 2, Table 3.1) f ct.eff ≔ f ctm: mean value of the tensile strength of the concrete effec ve at the me when the cracks may first be expected to occur E cm ≔ 33.3 GPa : secant modulus of elas city of concrete (Eurocode 2, Table 3.1) E c28 ≔ 1.05 E⋅ cm = 34.965 GPa : modulus of elas city of concrete. camps in fort mill
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