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I'm sorry I was too busy last month to reply.
I have resolved the issue using your method. Thank you.

You should use the modelSubset command to perform this kind of construction stage analysis.
In this way the new displacement will not be influeced by the intial disp



Thanks for your suggestions.
I have tried the modelSubset command to perform this kind of construction stage analysis, and I ...

In simple terms, I hope that the internal forces remain the same as in the first stage.

Thank you for your reply.
When I use the transformation handler, I can see opposite bending moments in the second stage.
However, I do not want to see opposite bending moments at this stage because this is a construction stages analysis. The structure has already deformed in the first stage, and ...

There is a staged construction steel-concrete composite beam which is modelled by elasticBeamColumn element. The construction stages are:
1. simply supported steel deck
2. fixed steel deck
3. fixed steel-concrete deck
In the first stage, only the steel deck was constructed. The steel deck is simply ...