Assessment of Existing Structures and Repairs - Offshore Structures: Design, Construction and Maintenance - page 501

TABLE 7.14 Checklist for Pushover Analysis — cont ' d

Yes/No

USFOS Analysis Checks

Before Analysis

Have you checked the topside load combination center of gravity
(CoG) via reaction loads?

Has the wave OTM been checked via fixing the jacket at known
elevation?

Do pile reactions from output file add up and make sense against
what is expected?

Has the pile model been checked by plotting pile head axial force
(with a linear jacket to ensure soil failure)?

Have you considered D/t yield strength reduction in the header file
(elastic and plastic local buckling)?

During Analysis

Has gravity (still water) pushover been completed for various and
worst drilling rig locations with appropriate load factors (API and
ISO)?

Have soil data (factor = 0.80) for API still condition been used?

Has 100-year storm (100-year wave + associated 1-year current)
pushover for various/worst drilling rig locations been completed with
appropriate load factors (API and ISO)?

Have soil data (factor = 0.94) for API storm condition been used?

Have you checked the serviceability limit?

Has 10,000-year storm (10,000-year wave + associated current)
pushover for various/worst drilling rig locations been completed with
appropriate load factors (API and ISO)?

Have soil data (factor = 1.0) for API and 1.15 F y for ISO in the 10,000-
year wave assessment been used?

Have you checked API spreadsheet maximum member capacity
predictions versus the software results?

Have the output files been checked for additional failure information,
such as buckling, joint failure and fracture, in order to understand the
analysis behavior?
Has a 100-increment solution been performed (without iterations) and
checked with a 1000-increment solution (worst cases)?