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How to calculate story drift for response spectra analysis?

How to calculate story drift for response spectra analysis?

How to calculate story drift for response spectra analysis?

(OP)
When perform reponse spectra load case in X direction, there is always some forces in Y direction. Sometimes the forces in Y direction is pretty large or even close to force in X direction. Therefore the drift in Y direction is close to the drift in X direction.

So how to check the story drift? Just check drift in X direction by neglecting drift in Y direction or use squre root of the sum of suqres of X and Y directions?

Thanks

RE: How to calculate story drift for response spectra analysis?

I assume that you are designing your structure using a force-based seismic design. If that is the case, how are you designing your structure, are you calculating your drift for the x and y-direction respectivly or are you modelling by x and y simutaneously. In the latter case, you will need to model 100% loading in one direction coincidental with 30% orthogonal loading.

RE: How to calculate story drift for response spectra analysis?

i think that you dont need to do the sum of sq roots of the two values ,but just check that the drifts values you getting in both x and y directions for same case and they should satisfy the limit set by Code you following.

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