Seismic Performance Evaluation and Retrofit of Fixed Jacket Offshore Platform Structures
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 4
Abstract
In this study the seismic performances of the fixed-base jacket structures with various bracing configurations were evaluated by nonlinear static and dynamic methods, and the effects of various retrofit schemes were compared. It was observed that the conventional retrofit methods of increasing member size were somewhat effective in increasing the strength of fixed steel jacket platform structures but were not so effective in increasing ductility. However, the ductility of the structures retrofitted with buckling-restrained braces turned out to be increased significantly. In the structures with conventional bracing, plastic hinges or buckling generally occurred at the upper half of the jacket structures. On the contrary, they were more uniformly distributed along the structure height in the structure retrofitted using buckling restrained braces. The capacity curves obtained from incremental dynamic analysis generally corresponded well with those obtained from nonlinear static analysis using a lateral load pattern proportional to the first mode shape of the jacket structure.
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Acknowledgments
This research was supported by a grant (13AUDP-B066083-01) from the Architecture and Urban Development Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government, and by the Samsung Engineering Co., Ltd.
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Information
Published In
Journal of Performance of Constructed Facilities
Volume 29 • Issue 4 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 3, 2013
Accepted: Jan 7, 2014
Published online: Jan 9, 2014
Discussion open until: Jan 26, 2015
Published in print: Aug 1, 2015
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