RCDC unable to read load combinations if added in analysis file as explained below:
I usually use load cases for basic loads like dead, live, wind (number 1, 2, 3, etc.). Then, i use another set of load cases where I use REPEAT and NOTIONAL for gravity loads only (load number 200, 201, 203, etc.). Finally I use traditional LOAD COMBINATIONS where I call repeated loads (for gravity) and basic loads (for wind and seismic).
There are two basic load cases exists with two repeat load cases. Two regular combinations exist which consist of repeat load cases. Presently RCDC reads Basic load cases and repeat load cases. As in any combination, dead load is must and same validation is provided in RCDC,I have assigned both the basic load cases as dead load in RCDC.
RCDC does not identified the Regular load combinations from analysis file when it is consisting of repeat load cases. If any regular combination is consisting of basic load case + repeat load case, it would be difficult to identify the type of load from repeat load cases. Adding linear load case and Non-linear load comb (repeat) in to one regular combination is not recommended and not handled in RCDC.