Khiem, N.T. and Luong, H.X. and Son, D. and Thu, N.V. and Tien, P.H. (2004) Assessment of base-structure connection by using the modal testing method for offshore structures. In: The Fourteenth International Offshore and Polar Engineering Conference - ISOPE 2004, 23 May 2004 through 28 May 2004, Toulon.
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Some jacket structures after a period of operation in Vietnam shelf become more vibratory sensitive to wave load. Weakening of the base-structure connections may cause it. On the other hand, a geological property of the seabed soil foundation in the offshore region of Vietnam has not been investigated sufficiently. This report is aimed to present some results obtained recently by the authors in assessment of condition at the base-foundation connection for test model as well as existing offshore structures by an experimental study. Firstly, some results obtained in an experiment carried out for determining some properties of coral foundation are presented. Then, using the spring model of connection between the seabed and structure, the spring's stiffness has been determined from the measured on existing structure natural frequencies by the system identification approach. Copyright © 2004 by The International Society of Offshore and Polar Engineers.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Divisions: | Offices > Office of International Cooperation |
| Uncontrolled Keywords: | Natural frequencies; Plasticity; Soil structure interactions; Springs (water); Stiffness; Structural geology; Base-structure connection (BSC); Identification; Modal testing; Wave loads; Offshore structures |
| Additional Information: | Conference code: 65480. Language of original document: English. |
| URI: | http://eprints.lqdtu.edu.vn/id/eprint/10192 |
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