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The horizontal beam is simply supported. I have assigned pinned to released the moment at the both ends. However, there's moment spike near the end in ETABS, what's the problem ? I have checked thru the model and couldnt find any problem related to it .

The correct BMD shall be blue (sagging moment) all the way in the SS beam....

I have assigned the slab as thin shell

enter image description here

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  • $\begingroup$ It looks like you have varying member stiffness everywhere. Can you upload the model with member end releases shown and a deflection diagram? Also, why the positive moment does not extend all the way to the left column? I guess the model contains errors. $\endgroup$
    – r13
    Jul 8 at 23:44

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