Title

Boundary updating of offshore jacket structures based on measured modal frequencies

Document Type

Conference Proceeding

Date of Original Version

9-19-2011

Abstract

The boundary conditions of offshore jacket structures at the sea floor are difficult to model numerically due to the complicate structure-soil interaction. This paper employs dummy pile members to represent the pile-soil system and intends to update the properties of the dummy pile members based on only a few measured modal frequencies of the true offshore jacket structure system. The purpose of this model updating is for matching the modal frequencies of the analytical model (for the combined system of superstructure and its pile foundation) well with the corresponding measured modal frequencies of the true system. An iterative procedure must be followed because of the nonlinear nature of this model updating problem, while at each iteration the cross-model cross-mode (CMCM) linear model updating method is employed. Numerical studies are conducted based on finite element model simulations associated with a real offshore jacket platform. The numerical results suggest that the proposed method is effective to achieve the intended model updating goal. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).

Publication Title

Proceedings of the International Offshore and Polar Engineering Conference

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