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storey drift

storey drift

storey drift

(OP)
how to calculate storey drift from SAP and displacement of center of mass.

RE: storey drift

Hi,
I don't think there is an option in SAP to directly assess storey drift.  But u can compute one from other data tabulated in SAP.

1. Select edge joints of a frame corresponding to different storey.
Display>Show Tables>Model definitions>Analysis Results>Joint output>joint Displacement. OK
2. Sort the required displacement (Say U1) in descending order.
3. Export it to excel & calculate difference in displacement of adjacent storey, which is the drift you want.

Computation of CM.
Before you can calculate the drift of CM. you have to locate it. Again, i haven't yet discovered a way to find it directly in SAP. so calculate it yourself. Data required are. 1. Joint Co-ordinates 2. Joint load. Both can be tabulated under "Model definitions"

Once you've done that. you may calculate the storey drift of all 2-d frames (say along X dirn.) You can linearly interpolate the drift of CM based on its co-ordinate.

Hope i could make myself clear.
Have fun!

PS: this post seems to be old! neva mind if u've already found its  better solution. If so.. please let me know.

 

RE: storey drift

(OP)
Thank you so much, your post made me clear to calculate drift.

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