How to define Modulus of Elasticity for time dependent properties
Question:
In the attached model, in construction stage 1, the age of concrete is defined as 7 days. In the material property for concrete C50 the Modulus of elasticity has been defined as E = 34000 N/mm^2 but in the result table it can be seen that for CS1 Stage itself it is showing a Start Elasticity of 34090.0507 N/mm^2, but the age of concrete activation is 7 days in stage 1 and stage 1 is of 14 days only. Kindly let us know is there a way to define the Modulus of Elasticity so that it calculates the time dependent properties properly.
Answer:
Hello,
In the attached model, in construction stage 1, the age of concrete is defined as 7 days. In the material property for concrete C50 the Modulus of elasticity has been defined as E = 34000 N/mm^2 but in the result table it can be seen that for CS1 Stage itself it is showing a Start Elasticity of 34090.0507 N/mm^2, but the age of concrete activation is 7 days in stage 1 and stage 1 is of 14 days only. Kindly let us know is there a way to define the Modulus of Elasticity so that it calculates the time dependent properties properly.
Answer:
Hello,
Greetings.
Thanks for reaching us.
The definition provided to time dependent properties is correct. Actually, at the age of 7 days, concrete is obtaining certain strength whose modulus of elasticity is the value obtained as per CEB-FIP 1990 code defined for compressive strength gain function. To verify this, I changed the value from 7 to 2 days as age of concrete at time of activation. The elasticity value obtained are
20210214_BIA_B1_Superstructure_10000 days Change Diap only - Creep 5.mcb
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