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  • Ec (S) is the modulus of elasticity for strength design.

    • For LRFD, Ec (S) is taken from the modulus used for deck properties.

    • For ASD, Ec (S) is calculated as 33 * gamma c1.5 * sqrt f √f 'c '.
  • Ec (D) is the deflection modulus of elasticity, given as Ec (S) / (creep factor), where creep factor is specified in the Preference menu.

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