Interpretation of Full-Scale Monitoring Data from a Jack-up Rig

This document summarises a study undertaken by MSL Engineering Ltd for HSE to determine the foundation fixity of the Maersk Endurer Jack-Up rig from measured data.

This particular Jack-Up does not have spudcan skirts, and therefore the results complement earlier studies on Jack-Ups having skirts.

Several sea states from two storms were examined so that conclusions could be drawn on the possibility of foundation softening occurring during a storm.

Foundation fixity was inferred from the observed natural period of the structure.

Comparisons of measured maximum displacement with predicted values using the inferred fixity levels have also been made.