Shrinkage strain in Ram concept according to AS3600

Thank you Seth, would you mind give a hand calculation example.

I added some notes on determining the shrinkage strain to our wiki on Load History Parameters and AS 3600. Please review and let us know if this answers your question.

Load History Parameters and AS 3600

The final 30-year shrinkage strain including all adjustments is the shrinkage value that should be input into RAM Concept. k1 is a function of time and the thickness of the section. The time-dependent part is taken care of automatically by the program through the ACI 209 model and the input duration for each load history step. The adjustment for the section thickness, however, needs be accounted for in the input ultimate shrinkage strain.

Thank you for pointing out the typo with the step 4 reference. That is corrected now.

Karl,

So for the k1 formula the time value is the total design life i.e. 30 years? 

Then for shorter durations RAM automatically adjusts this value?

That is correct

Hi Karl,

Just want to confirm if the number input in the example (Load History Parameters and AS 3600) is incorrect? As per Seth's reply above, should this be the total shrinkage (drying and autogenous shrinkage)

Yes, 0.000591 should be input for the shrinkage strain. That input should represent the final shrinkage strain including both drying and autogenous shrinkage.

By the way, RAM Concept Version 8 Update 2 will be released very soon. That version will have the AS 3600-2018 creep and shrinkage model, and the information on the wiki you referenced above will be obsolete.

Yes, 0.000591 should be input for the shrinkage strain. That input should represent the final shrinkage strain including both drying and autogenous shrinkage.

By the way, RAM Concept Version 8 Update 2 will be released very soon. That version will have the AS 3600-2018 creep and shrinkage model, and the information on the wiki you referenced above will be obsolete.