hydrostatic uplift safety factor 1

[PSF]

I am designing deadmen to support a tank that will be submerged. What safety factor, if any, do I use against uplift and where is it documented?

 

[civilperson]

Use 0.6 DL with other loads for buoyancy calcs. Assume no backfill is in place during the monsoon rain event.

 

[PSF]

Is that from a code that I can refer to?

 

[kslee1000]

If you are perform stability analysis, check USCOE (US Corp of engineers)for suggested factors of safety.

Ee used to use SF >=1 for the worst case scenario - max. ground water table while tank is empty.

 

[civilperson]

ASCE 7, Chapter 2.

 

[msquared48]

If you use the .6 factor instead of the .9, then a factor of safety of about 1.5 is included in your design calculations against uplift.

Mike McCann
MMC Engineering

 

[oneintheeye]

1.1 in uk. from code.

 

[cbosy]

I have recommended 1.1 before provided you are very confident about the high groundwater level.