Hello. How does STAAD compute the modulus of elasticity of concrete (default material properties)?
The default values are:
fcu is 27.58 MPa
E is 21728 MPa
Say I would like to use f'c = 27 MPa, what would be the corresponding E and fcu?
I know that f'c is about 0.8fcu.
Thank you!
Bump.
super bump
The E values for standard materials like concrete, steel etc. are predefined within the program. However if you would like to provide a slightly different value than these, you can define a new material say MATERIAL 1 and then specify the E accordingly. FCU reported as part of the material definition in STAAD.Pro is the concrete compressive strength and is the same as what is entered through the design parameter FC. The FCU from within the material definition is not used anywhere else in the program. For concrete design, you need to specify the design parameter FC and the software would use that to calculate the concrete stress as per the equations in the design code being used.
Design codes provide relation between Ec and f’c. For example the as per equation 19.2.2.1.b of ACI 318-14, Ec=57000(f’c)^0.5 in psi units.
Thank you for responding Sye. I have been googling this subject for a while and not found an answer.
I'm with you on the ACI equation for concrete's Young's Modulus, but wouldn't the overall stiffness (EI) of the concrete vary by how much reinforcement is in it? Also, the inertia would vary depending on whether the concrete was cracked or not cracked.
If I am using plate elements in Staad, then how can I account for for this? Or more generally, how do i know the moments and shears generated in my FEA model are an accurate representation of the real world?
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