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| Dynamic response of jacket platform considering connection dampers |
| Revised:February 28, 2003 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20036128 |
| KeyWord:jacket platform,semi-rigid connection,modal-damping ratio,seismic response |
| Zhang Wenshou~* Lu Liqin |
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| Abstract: |
| To reduce dynamic response of a jacket platform, energy dissipation materials may be placed between the tube joints. An equivalent element model is established by idealizing tube joints and energy dissipation materials as rotational spring and damper respectively. This paper derives the stiffness matrix, mass matrix and damping matrix of the equivalent element using a combination of the finite element method and the direct stiffness method. The complex modal analysis is carried out to determine dynamic characteristics of the jacket platform, and a generalized pseudo-excitation method is performed to analyses the responses of the jacket platform subjected by earthquake excitation. The effects of connection stiffness and rotational damper on dynamic characteristics and the seismic performance of the jacket platform are discussed. The parametric studies on the example jacket platform with and without the connection dampers show that there is an optimal damper damping coefficient by which the modal-damping ratio of the jacket platform can be considerable increased and the seismic responses can be significantly reduced. |
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