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Moment on beam

Moment on beam

Moment on beam

(OP)
Can you guys explain to me, why my moment on beam looks like this


Not like this



And what is the differences between both of them?

RE: Moment on beam

Looks like you're looking at the envelope diagrams which includes lateral load cases in the first one. In the second one, I don't think lateral force combinations are included in the envelope, that's why the envelope looks like the one due to gravity loads.

The difference between the two is just that, the direction of applied forces. Which you should be easily able to tell if you've completed an elementary structural analysis course.

RE: Moment on beam

(OP)
For the first one im not using lateral force except earthquake loads. Is it posible moment on the first one looks like that because earthquake loads?

RE: Moment on beam

Yes, Earthquake loads are definitely a lateral load that would produce the first type of diagram.

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