Creep and Shrinkage
Creep and Shrinkage
(OP)
Hi all,
How does one consider creep and shrinkage in analysis of a structural element? For example, do you actually check different design stages by adding the strains due to shrinkage and creep to the strains present in the section from loading to increase the stresses?
So, for the long term case, I add the final shrinkage strain(calculated according to BS EN 1992-1-1) as an imposed deformation? Because it is an indirect action similar to temperature.
And a final question, does this apply for all load cases? ULS, SLS characteristic, quasi permanent?
If anyone has a good reference that explains these things I'm happy to plough through it myself, I'm not asking anyone to do my work here, I just want to understand! It doesn't matter about the code, it's more the principle I'm trying to properly grasp.
:) as always, Thanks chaps
How does one consider creep and shrinkage in analysis of a structural element? For example, do you actually check different design stages by adding the strains due to shrinkage and creep to the strains present in the section from loading to increase the stresses?
So, for the long term case, I add the final shrinkage strain(calculated according to BS EN 1992-1-1) as an imposed deformation? Because it is an indirect action similar to temperature.
And a final question, does this apply for all load cases? ULS, SLS characteristic, quasi permanent?
If anyone has a good reference that explains these things I'm happy to plough through it myself, I'm not asking anyone to do my work here, I just want to understand! It doesn't matter about the code, it's more the principle I'm trying to properly grasp.
:) as always, Thanks chaps






RE: Creep and Shrinkage
If creep is relevant...yes..you have to consider
same for all other possible loads and situations
best regards
Klaus
RE: Creep and Shrinkage
To extend this further, if I have calculated a total strain due to autogenous and drying shrinkage, how do I apply this to a section?
Do I add these strains to the existing strain due to load in the section and check the effects?
Sorry, if the first question or this one is not too clear.
RE: Creep and Shrinkage
RE: Creep and Shrinkage
RE: Creep and Shrinkage
Dik
RE: Creep and Shrinkage
Shrinkage strain does not equate to stress in a member. Any stress due to it is due to restraint of shrinkage strain. Reinforcing internally will provide partial restraint. Connected elements may provide external restraint. But if there is no restraint, there is no stress unless the shrinkage strain is not linear..