dead weights and live weight for checking anchor bolts..
dead weights and live weight for checking anchor bolts..
(OP)
While checking anchor bolts Table 3.21 ( up lift loads)
DEAD weights W1, W2 and W3.
My understanding is these are Dead weights only.
Weight of liquid is not included.
Is this correct??
Why not including the liquid weight ???
DEAD weights W1, W2 and W3.
My understanding is these are Dead weights only.
Weight of liquid is not included.
Is this correct??
Why not including the liquid weight ???





RE: dead weights and live weight for checking anchor bolts..
Yes, dead loads only.
One thing that is not clear to me is that if pressure loads exceed the weight of the roof plate, then the entire roof plate should be included in the dead load- but the definitions shown don't include it.
Liquid load is not included here because in order to transfer a significant amount of liquid load to the shell, the shell must move up somewhat. This is possible with an unanchored tank, but not with an anchored tank.
The inclusion of liquid load in the overturning equations in 3.11.2 is a new thing- I think added due to the realization that adding roof uplift drastically increases the overturning moment in many cases.
RE: dead weights and live weight for checking anchor bolts..
RE: dead weights and live weight for checking anchor bolts..
RE: dead weights and live weight for checking anchor bolts..
So I state my question a bit differently..
Assume a tank with a SELF supporting roof:
by using the following Notation:
Wroof = weight of roof plates.
Wstructures= Weight of structures supporting the roof
Wshell= weight of all tank shell INCLUDING weight of
manholes, plates. Laaders welded on to these shells.
Weight of annular plates and weight of bottom plates NOT included
1/-Are the following W1 , W2 and W3 as defined in
API-650 paragraph 3.21 correct ?
W1= Wshell + Wstructures (corroded)
W2= Wshell + Wstrucures + Wroof (corroded)
W3= Wshell + Wstructures (UNcorroded)
Why not include a fraction of the roof ??
2/-Do we have to include elswere the weight of the products when treating sismic for instance ??
RE: dead weights and live weight for checking anchor bolts..
When doing seismic design, product weight resisting overturning is included only for the overturning check, but is not included in the anchorage load calculation.