Dear Bentley,
Can you clarify how concrete modulus at specified time is determined for load history analysis in RAM Concept?
I see that we input Ec for 28 days and later, Eci for inital stressing (2-3 days typically), how about if I want to input load step at 7 days for example?
Thanks,
Quang
You'll find some details in the program manual, chapter Load History Deflections, and also here: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/6191/ram-concept-load-history-calc-options-tn
E itself is not changed in the Load History Stages. For more on that see: https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/125667/ram-concept---load-history-construction-sequencing-discussion
Dear Seth,
Thanks for this reply.
Using concrete modulus at 28 days only could be fine for me because the change of concrete modulus in time is not significantly different.
However, can you explain the purpose of initial concrete modulus Eci in Material tab of RAM Concept?
Moreover, as I as I know, RAM Concept use method of Ghali to determine long-term deflection
So adjusted concrete modulus is used (because no detailed information in RAM Concept manual, so correct me if this is not the method RAM Concept adopts), and concrete modulus at specified time should be used
That paper by Jonathan Hirsch is the basis of our Load History method, so it's reliable. It's also here in full: https://communities.bentley.com/products/ram-staad/m/structural_analysis_and_design_gallery/87861
Eci is used in some initial service (transfer) code checks in Ram Concept, but not much else.
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