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THE MODEL DEFORMS LATERALLY UNDER DEAD CASE !

THE MODEL DEFORMS LATERALLY UNDER DEAD CASE !

THE MODEL DEFORMS LATERALLY UNDER DEAD CASE !

(OP)
Hi all
I have modeled a building of 4 stories and before defining load combinations and lateral load patterns ,the model behave normally under dead load, after defining earthquake patterns it deforms excessively in x and y...
I have attached a shot of deformed shape under Dead case, I would appreciate your opinions

RE: THE MODEL DEFORMS LATERALLY UNDER DEAD CASE !

Can't really tell from the screenshot. What does the structural form look like and the deformed shape in 3d.

Are you missing a support perhaps?

RE: THE MODEL DEFORMS LATERALLY UNDER DEAD CASE !

Are you sure the X and Y displacements, due to dead load, are changing when you add the earthquake pattern? ETABS might be changing the scale for drawing the displaced shape on the screen.

I'd try this:
1. Delete the earthquake load pattern.
2. Run the dead load case and write down the X and Y displacements at the center of the roof.
3. Add the earthquake load pattern.
4. Repeat #2.

RE: THE MODEL DEFORMS LATERALLY UNDER DEAD CASE !

What is the value of discplacements?

Jason McKee
proud R&D Manager of
Cross Section Analysis & Design
Software for the structural design of cross sections
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