A New Method of Using Liquid Damper to Reduce the Displacement of the Monopile Offshore Platform against Seismic Loads

The efficiency of a tuned liquid damper (TLD) in controlling the dynamic responses of offshore monopile platforms under seismic excitation has been investigated in this paper. Damping is performed by applying a type of reservoir inside a tower, which is designed optimally via seawater and a monopile...

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Bibliographic Details
Published in:Journal of marine science and application 2023-06, Vol.22 (2), p.324-333
Main Authors: Shahrbabaki, Naeim Eslami, Nekooei, Masoud, Hassanabad, Madjid Ghodsi
Format: Article
Language:English
Subjects:
Chemical analysis
Damping
Earthquake dampers
Earthquake loads
Earthquakes
Electrical Machines and Networks
Engineering
Finite element method
Geotechnical Engineering & Applied Earth Sciences
Machinery and Machine Elements
Offshore Engineering
Offshore platforms
Offshore structures
Power Electronics
Research Article
Reservoirs
Seawater
Seismic activity
Seismic response
Vibration
Water analysis
Work platforms
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Summary:The efficiency of a tuned liquid damper (TLD) in controlling the dynamic responses of offshore monopile platforms under seismic excitation has been investigated in this paper. Damping is performed by applying a type of reservoir inside a tower, which is designed optimally via seawater and a monopile body. Hydrodynamic forces due to water surface oscillation in the reservoir act as resistant forces against structure vibration and displacement. Using ANSYS finite element (FE) software, a monopile structure with the same dimensions as the samples in the Persian Gulf climate was modeled and then analyzed in this research using the transient time history analysis related to the records of El-Centro, Kobe, and Tabas earthquakes for seismic investigation. The dynamic responses of the monopile platform with and without TLD were compared after the completion of FE results. Findings show that using the mentioned TLDs reduced structure displacement by more than 50% based on the earthquake frequency content.
ISSN:1671-9433
1993-5048
DOI:10.1007/s11804-023-00325-x