STAAD Offsets effect on drifts on concrete structure

[teach_me]

Hello, i'm learning staad and so far i have noticed certain effect of applying offsets as to not. For example, a 5 storey model fails on story drift check when the column to beam connections are at default (centroid to centroid). However when offsets are applied so that beam ends at the face of the column, storey drift values suddenly passes the allowable. What's the correct way of doing this on staad? do i do serviceability checks first before applying offsets, and then apply offsets after then go to concrete design of reinforcements?

 

[JoshPlumSE]

To me this is a matter of engineering judgment.

For concrete structures, I would feel comfortable using rigid end offsets for the end of beams in a concrete frames. I tend to do it for BOTH the serviceability and the design checks.... Though a big caveat is that I don't know the STAAD's design code capabilities and limitations. Note that I would NOT use these rigid offsets for a steel frame. But, that's a more complex topic.

Some people would use end offsets for both the concrete beams and concrete columns. That the beam/column joint is considered rigid for both the beam and column sides of the joint. I don't feel comfortable with that. But, some engineers do.