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Saddles:
The input for allowable anchor bolt shear
stress is a user defined input.
COMPRESS does not investigate possible uplift
on the foundation for saddles. Most horizontal
vessels will not be subject to uplift. Some
designers are building vessels for floating
platforms and applying lateral forces equivalent
to multiple 'g' forces, in such a case uplift may
result. In this case even the 'Zick' analysis
for stresses in the shell should be reviewed
to determine if it is still applicable. Such
usage is currently outside the scope of COMPRESS.
Base Rings for Support Skirts:
By default, this value is 20,000 psi. If
changed to '0', the value is changed to
20,000 psi when the calculations are run.
For vertical vessels supported on skirts,
COMPRESS does not investigate shear on the
anchor bolts. Generally, shear force due to
wind/seismic would be taken out by friction
between the base plate and the foundation
(grout) or, if the force is great enough,
shear bars should be provided.
Support Legs:
By default, this value is 20,000 psi.
If changed to '0', then the value is
changed to 20,000 psi when this input
loses focus (ie: you move the cursor to
another field).
For vertical vessels supported on legs,
COMPRESS does not investigate shear on
the anchor bolts. Generally, shear force
due to wind/seismic would be taken out
by friction between the base plate and the
foundation (grout) or if the force is great
enough then shear bars should be provided.
Support Lugs:
No investigation
is made of anchor bolts for support lugs.
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