Civil Engineering Reference
In-Depth Information
TABLE 5.8
Checklist for Topside Lift Analysis
—
cont
'
d
Check
(Yes/No)
Items
Check Point
5
Support conditions for hook point(s)
6
Adequacy of analytical springs
7
Modeling of sling and hook for 75%
-
25% sling load
distribution (sling mismatch)
Loads
It is assumed that the load calculations are verified in the
in-service analysis and only relevant load cases are
picked for the current analysis. Remove future loads,
post-installed items, operating weights and live loads
1
Load contingencies
2
DAF, skew load factors, consequence factors
3
Proportionate distribution of sling loads (75%
-
25%)
4
Calculations for center-of-gravity shift
5
Check load combinations, include rigging loads
Analysis Results
1
Enclose sea-state summary
2
Enclose member check report: review overstressed
members
3
Enclose joint check summary: review overstressed joints
(check
F
y
= 2/3
F
u
for chords of high-strength members)
4
Enclose spring reactions equal to zero for correct hook
location in the model
5
Enclose sling forces equal to zero moment and shear; there
are only axial forces
6
Enclose deflection plots, member unity check ratio plots
7
Weight-control report extract enclosed and the weight
comparison carried out
Padeye Design
1
Appropriate selection of padeye plates, sling and shackle size
2
Padeye design force as per the latest lift analysis
3
Padeye stresses checked at the attachment to the main
structure
4
Stresses in the member-supporting padeye
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