Anchorage requirements for Pf Uplift
Anchorage requirements for Pf Uplift
(OP)
If calculations show that no anchorage is required for Net uplift, seismic and wind loading do they still net to be installed to resist internal uplift at the calculated failure pressure?
Thank you
Vance
Thank you
Vance





RE: Anchorage requirements for Pf Uplift
Joe Tank
RE: Anchorage requirements for Pf Uplift
RE: Anchorage requirements for Pf Uplift
RE: Anchorage requirements for Pf Uplift
RE: Anchorage requirements for Pf Uplift
F.6 begins with, "In tanks that meet the criteria of 5.10.2.6, failure can be expected to occur"... (paraphrasing) at the compression ring / roof juncture.
I stop at that point and take that as the definition of failure pressure. It could also mean, but is not stated, "In tanks that do NOT meet the criteria of 5.10.2.6, failure can be expected to occur at the anchorage attachment area" i.e. take off like a missile.
In that case you would still have a failure pressure that would occur, just not at the compression ring area, and therefore Pf would not = the equation provided by F.6
RE: Anchorage requirements for Pf Uplift
Assuming that a tank falls under F1.3, there is a minimum pressure involved and thus a minimum top angle area per F.5.1. But it seems this area will always be greater than the maximum area allowed under 5.10.2.6, such that F1.3 tanks are inherently non-frangible. I think the significance is that 5.10.2.6 is based on avoiding uplift at the shell, while F1.3 is limited to the uplift case. If failure pressure is limited to frangible tanks falling under F1.3, then that would not include any tanks.