In the attached picture, there are Trilinear Relationship and related parameters of concrete material in PERFORM 3D software.
How to determine these parameters (compression stress FY, FU; compression strains DU, DX;....)? or Which document I can get these parameters?
elastic modulus of concrete (Young's modulus)=4400√fcu N/mm2
fcu: compressive strength of cylindrical concrete (15cm *30cm ) after 28 days
stiffer material will have a higher elastic modulus.
𝜀cu: maximums compression strain of concrete = .003
allowable tension stress in concrete = .6√fcu N/mm2
Thank you Ahmed!
How about the the value of FY, FR, DL, DR for both tension and compression?
All the values are obtained from test results and the shape of curve vary fro test to test.. If you have recorded the values of stress and strain by some data logger, you can get the values from there.
If you don't have the recorded stress-strain curve, you can calculate them base on the "theoretical" stress-strain curves such as the ones developed by Mander, modified Kent and Park, Roy and Sozen, etc. and then develop an simplified version (bilinear or trilinear with or without strength loss/tension strength) which you will use in PERFORM. All these models required the actual f'c (obtained from a test). The explanation of the parameters are in Chapter 1 of the "Components and Elements" document.
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