Passive and semi-active nonlinear negative stiffness control of an offshore jacket platform under earthquake-induced hydrodynamic interaction

Zhang, Yafei and Sun, Li 2026. Passive and semi-active nonlinear negative stiffness control of an offshore jacket platform under earthquake-induced hydrodynamic interaction. Ocean Engineering 368 (Part 3) , 128439. 10.1016/j.oceaneng.2026.128439

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Abstract

Earthquake-induced hydrodynamic interaction can substantially alter the seismic response and control performance of offshore platforms. This study investigates nonlinear negative stiffness control of a jacket platform considering motion-induced hydrodynamic feedback. A five-degree-of-freedom (5DOF) formulation is validated against a published benchmark and adapted to a lightweight-topside configuration. Motion-dependent hydrodynamic forces are evaluated using the Morison equation. A fixed-parameter passive nonlinear negative stiffness device (P-NNSD) and a displacement-triggered semi-active NNSD (DTSA-NNSD) are assessed. For a representative record, hydrodynamic interaction increases peak Level-5 relative displacement and absolute acceleration by approximately 50% and 25%, respectively, and Level-4-to-5 inter-story displacement by 40%. Across five ground motions, the P-NNSD reduces mean peak inter-story displacement, absolute acceleration, and base shear by 61.1%, 11.8%, and 10.5%, respectively; the corresponding DTSA-NNSD reductions are 73.5%, 15.0%, and 18.0%. Relative to the P-NNSD, the DTSA-NNSD further reduces peak inter-story displacement and absolute acceleration by 31.9% and 3.6% for this record. The NNSD contains no explicit energy-dissipation component, and the assessment is limited to a simplified lightweight-topside configuration, five ground motions, prescribed device location and control parameters, and idealized DTSA switching without experimental validation. Within these limits, response-dependent regulation outperforms fixed-parameter control.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
Publisher:	Elsevier
ISSN:	0029-8018
Date of First Compliant Deposit:	5 October 2026
Date of Acceptance:	24 September 2026
Last Modified:	05 Oct 2026 09:45
URI:	https://orca.cardiff.ac.uk/id/eprint/189976

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