I was unable to proceed with Adding Composite Section for Construction Stage. Error appeared with message "Cannot calculate stiffness"
Answer: Hello,
Actually the issue is with the composite section for construction stage definition. Part 1 is activated in Active stage, i.e., CS1. Part 2 is also being activated in CS 1. Both the parts of a composite section can't be activated in the same construction stage. I defined a second construction stage and activated Part 2 in CS2. Now, there is no issue is definition.