|
Knowledgebase Article 1108
|
|
Question:
|
Why doesn't COMPRESS apply the maximum bending
moment to the anchor bolts in my base ring
report? Does this result in the required area
of the bolt being reported as zero (0)?
|
|
Answer:
|
When full reports are selected (not minimal
reports), COMPRESS reports the anchor bolt
and base ring calculations for each load case
described in the summary table at the top of
the Base Ring report. When minimal reports are
selected COMPRESS reports only the governing case.
The anchor bolts are subjected to the tension
force arising from the overturning moment acting
on the vessel from wind, seismic, etc. This tensile
force is counteracted by the weight of the vessel
and contents. In some cases the weight may be
greater than the uplift acting on the anchor bolt;
in such a case there is no net uplift acting on the
bolt (a message is so expressed in the base ring
report) and there is no net tension force acting
on the bolt. Thus the required bolt area is '0'
(the bolt does not act in compression).
When all load cases result with no uplift acting
on the bolt, the governing condition (reported
when minimal reports is selected) results in the
negative value of least magnitude (i.e.: it is the
"least negative" value for the set of
load cases). This will often correspond to the
load case with the smallest value of weight W
and may correspond to a load case with no
bending moment.
|
|
|