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High Rise Drift

High Rise Drift

High Rise Drift

(OP)
I am trying to get a handle on hi-rise drift and i have two questions considering a 500ft building w/ concrete shearwalls:

1.  is 3/8" interstory drift too strict for hi-rise buildings with shear walls? what is more appropriate for hi-rise?

2.  is it appropriate to evaluate 10-year storm drift using something greater than the ACI 0.35 cracked factor?
 

RE: High Rise Drift

1. I would look at using around H/400 if that is what 3/8" works out to

2. You are allowed by ACI to multiply the standard inertia reduction factors by 1.43 (section R10.11.1) for service analysis.

RE: High Rise Drift

Typically on taller buildings, the gravity loads are so high that they really help to negate the tension created in walls due to moment. I think it is common to run walls as uncracked.

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