High Rise Drift

[Galambos]

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?

 

[haynewp]

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.

 

[slickdeals]

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.