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h1. What is the definition of Ec(S), |
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Ec(D) and |
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Ec(V) in ETABS Composite Beam Design Output? |
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The modulus of elasticity for strength Design |
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Ec(S) |
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is taken from modulus of elasticity used in Deck Properties for LRFD design code. For ASD code, program is computing the Ec(S) based on {math}33 |
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* gamma_c^1.5 |
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* sqrt{f_c^'}{math}. For deflection Ec(D) |
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, modulus of elasticity is computed based on Ec(S)/(Creep Factor) which is specified in Preference menu. For Vibration, the modulus of elasticity |
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Ec(V) |
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, computed for strength is amplified by 1.35 as suggested |
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in AISC Guide 11, page 12. Since the modulus of elasticity is changed, causing modular ratio to be different for Strength, Deflection and Vibration which produces different transformed inertias. |