Dear @Soheil_Radfar
Thanks for your question. I also want to consider the correlation in both of the design and environmental variables by the copula formalism which mentioned here. Unfortunately, I couldn’t implement the @moustapha’s suggestion on changing the:
“uq_runReliability.m” - Lines 19-40
I was wondering if you could share your achievements 
It’s worth mentioning that It’s an honor for me to have the developers’ guidance too.
Best regards
Ali