A Compliant Cell Tuned Liquid Mass Damper with Inerter for Vibration Control of Offshore Jacket Structure under Multi-Hazards

Traditional liquid and mass dampers’ performances are often inadequate to significantly mitigate vibrations of offshore platforms induced by environmental forces, primarily due to high mass ratio requirements. The present study introduces a control mechanism by integrating an inerter system with a geometrically modified existing water storage tank. In detail, the proposed arrangement transforms an existing tank into a compliant cell-tuned liquid mass damper with an inerter (CCTLMDI). The advantage of the proposed arrangement is that it can serve dual functions, i.e., fulfil the water tank's functional requirement and act like a tuned mass damper with amplified mass. The efficacy of the proposed CCTLMDI is elucidated by controlling wave vibrations of a realistic jacket platform modelled as a multi-degree-of-freedom (MDOF) system. A probabilistic performance analysis is performed considering the randomness of the wave load. Energy dynamics are also studied under varying sea state conditions. Further, the performance of the proposed CCTLMDI is verified under multiple hazards, i.e., wind and earthquake excitations and in combinations with wave load. Additionally, CCTLMDI's performance is evaluated for a multi-storey building under earthquake and wind loads to demonstrate its efficacy. Results demonstrate its superior vibration control efficiency compared to conventional systems for offshore structural applications.