Abstract：To ensure the safe operation of offshore drilling work, the modal reconstruction method based on optimization theory is proposed, which is used for the bearing capacity estimation and structural safety evaluation of offshore rig substructure in service. Combining with engineering experience and test data, the problem on the finite element model updating is transformed into optimization parameter estimation. The numerical model is updated by the test results, its error is less than 6% under high load. The updated structural parameters are used as reference values to simulate the static and dynamic mechanical properties. Then the failure shape, dangerous position and its safe bearing capacity can be forecast more accurately.
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2021, Vol. 42 
