(1) I analysed a framed structure model in STAAD Pro with EQ X, EQ Z, Dead Load and Live load as primary loads and used repeat load instead of Load combination and analysed with P Delta analysis.
Now I want to design this structure with RCDC. I created new project with above STAAD Pro file. In this RCDC shows all loads including EQ X, EQ Z, Dead load, Live load and all repeat loads in basic load cases. What load type I assign to repeat loads and How I generate load combination?
If I use only EQ X, EQ Z, Dead load and Live load I can Generate load combinations as per IS 456-2000. But How I use repeat load results in RCDC.
If I use only repeat loads, it says no DL selected.
And How generate load combination for Sizing in footing design by RCDC?
(2) What load type to be assigned to live load in RCDC? Live load or Reducible Live load? And what will be effect of Live load or Reducible Live load when I select Live load reduction in Design settings of column Design? Which option should be taken for footing design?
To be able to use the REPEAT LOAD cases directly from STAAD.Pro in RCDC, you need to install the latest RCDC version 22.214.171.124. Subsequent to that when you launch RCDC through the Advanced Concrete Design option within STAAD.Pro, you will see only the primary load cases as part of the basic load cases. You will identify the load types for these cases and click on OK. Next when you get to the load combinations dialog box, you may choose the Add from Analysis option and it would let you select any REPEAT LOAD as well as any load combinations directly from within the STAAD.Pro model.
For load combinations or REPEAT LOADs taken directly from STAAD.Pro you can just go with the Live load as the results are going to be read directly from the STAAD.Pro analysis itself. The Live Load reduction will only be applied in appropriate cases during the design if you are generating the load combinations in RCDC.
Sir one more thing I want to ask about RCDC:
When I design column in RCDC, it always checks column for sway and no sway only with Earthquake loading. Why not it uses other loads or load combination for the this?
RCDC performs the Sway checks for all lateral load cases. Critical is presented in the design calculation report. if it is due to earthquake it doesn't mean that it is not checking for Wind load or other lateral loads.refer below link for validation problem on Sway calculation as per IS 456.
Sway calculation_IS 456