Reduction-Based Model Updating of a Scaled Offshore Platform Structure
Publication: Journal of Engineering Mechanics
Volume 136, Issue 2
Abstract
This paper attempts to develop a reduction-based model updating technique for jacket offshore platform structure. A reduced model is used instead of the direct finite-element model of the real structure in order to circumvent such difficulties as huge degrees of freedom and incomplete experimental data that are usually civil engineers’ trouble during the model updating. The whole process consists of three steps: reduction of FE model, the first model updating to minimize the reduction error, and the second model updating to minimize the modeling error of the reduced model and the real structure. According to the performance of jacket platforms, a local-rigidity assumption is employed to obtain the reduced model. The technique is applied in a downscale model of a four-legged offshore platform where its effectiveness is well proven. Furthermore, a comparison between the real structure and its numerical models in the following model validation shows that the updated models have good approximation to the real structure. Besides, some difficulties in the field of model updating are also discussed.
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Acknowledgments
The work in this paper was supported by the cooperation research project between China National Offshore Oil Corporation (CNOOC) and Chinese Academy of Sciences (Project No. CASKJCX2-SWL03-01) and also supported by the Knowledge Innovation Program of the Chinese Academy of Sciences. All of the experiments in the paper were completed with the cooperation of Professors Zhonghan Shen and Yubiao Liu in the Institute of Mechanics. Their help is greatly appreciated.UNSPECIFIED
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 136 • Issue 2 • February 2010
Pages: 131 - 142
Copyright
© 2010 ASCE.
History
Received: May 19, 2005
Accepted: Sep 4, 2009
Published online: Jan 15, 2010
Published in print: Feb 2010
Notes
Note. Associate Editor: Andrew W. Smyth
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