May be you forget to assign the properties.
Sometimes you assigned but it can be like that.
So select the properties and assign th material agian.
It can be OK.
Thank you very much for all generous reply engineer.
I get the answer from my senior engineer.
He explain me that different between moment frame & simple frame(pin-braced frame).
Moment frame: takes all moment connection & pin braced frame doesn't take moment n only shear n bracing takes lateral...
Dear IngDod,
Thank you for explain.
Plz check my model and tell me which is false...
My connection is not good enough so I only attach JPEG not staad model.
Thank you very much...http://files.engineering.com/getfile.aspx?folder=60ded428-6321-4b55-a63a-75e74fc8dc2f&file=aa.JPG
I understanding is pin connection which doesn't take any moment, only shear & bracing take lateral. So I model one space frame which is all pin connection: so I do all releases & bracings in X & Z direction: which release in My & Mz. But the bracing is assigned as truss, always show...