diaphragm failure

[Nextjoe]

Can some one tell me how can i got this result ?
I'm using response spectrum analys, and i have applied diaphragm constraint. But the deformed shape of the model is unusual as you can see in the picture below

 

[JasonMcKee71]

Try reassigning the diaphragms from scratch.

Jason McKee
proud R&D Manager of
Cross Section Analysis & Design
Software for the structural design of cross sections
Moment Curvature Analysis
Interaction Diagrams
Reinforcement Design etc.

 

[Nextjoe]

I've Reassign Diaphragm many times, but still the same result. In other Forums they suggest me to check, does every member connected to the same joint. but still have the same result. any other ideas ?