Feasibility of reducing dynamic response of a fixed offshore platform using tuned liquid dampers

Abstract

ABSTRACT Fixed offshore platforms are always subjected to dynamic loading. A potentially economical method to improve the dynamic behaviour of these platforms is using passive control devices. In this paper, the application of tuned liquid damper, TLD, in controlling the response of a fixed offshore platform located in the Persian Gulf against earthquake and wave loading was studied. Analysis of a 3D model of the structure equipped with TLDs was carried out using the finite element method, and the efficiency of TLDs was investigated. Also, the equivalent models of TLDs were constructed based on the lumped mass method, and linear wave theory and the results were compared to finite element modelling of TLD. Results showed good agreement between the finite element model of TLD and equivalent lumped mass model. Results also indicated that adding TLDs can mitigate jacket deck vibrations and their efficiency increases as wave height or ground motion increase.