Dear all,

As per my understanding, we use Young's modulus of elasticity of the material when it is under the linear range and we use secant/tangential modulus of elasticity when it is in the inelastic range.

The material I am concerned with is "concrete" and I am dealing only in the "linear range". So, my confusion is whether the codes (like ACI, Eurocode) are based on Young's modulus or some other? If it is based on modulus other than Young's, [sounds rediculous but] is there any way of converting them from one form to another?

Any explanation or ideas on this would be very helpful.

Thank you.

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