Civil Engineering/Bending moment

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Question
Bending moment diagram
Bending moment diagram  
Salam sir, I have done analysis of 2d frame in sap2000 but i got Bending moment greater for top column than bottom column and it will be very difficult to provide greater reinforcements in column above below on e which has low area of steel.where i am committing mistake.plz guide me
the load combination is 1.2DL+1.6LL

Answer
Dear Slaeem

For gravity loading, the end moment of beams must get balanced with column moments. Each beam moment in lower stories are balanced  with 2 column sections while the moment of top stories should be tolerated with a single column section. Then it is not a mistake to get greater moments in top columns.

Regards
beh

Civil Engineering

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