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Strength Factor for Hydrostatic Uplift from Flood Loading

Strength Factor for Hydrostatic Uplift from Flood Loading

Strength Factor for Hydrostatic Uplift from Flood Loading

(OP)
When sizing steel in the top mat of a slab for hydrostatic uplift from flood waters what is the appropriate load factor? Under normal ground water I have been using 1.6 as described in ASCE but would it be acceptable to use the 1.0 or 2.0 factor used for Fa depending on the location? In my case it would be 1.0 I wasn't sure if Fa is referring primarily to the hydrodynamic loading from moving water, waves, and debris and the flood hydrostatic uplift should be treated like H?

RE: Strength Factor for Hydrostatic Uplift from Flood Loading

I've never designed for flood loading myself but I believe Fa accounts for groundwater elevation (hydrostatic) in addition to any wave or hydrodynamic loading you might see. Reading the commentary of ASCE 7-10 section C5.4.2 they say that hydrostatic loads include uplift or buoyancy. In that case I would say that you're allowed to use a 1.0 factor although if you want a higher factor of safety you can use a 1.6 factor.

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