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

Abstract

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.

Keywords

Tuned liquid damper (TLD) / Offshore platform / Monopile platform / Seismic excitation / Dynamic response

References

[1] Carrier G, Miles J. On the annular damper for a freely precessing gyroscope. Journal of Applied Mechanics, 1960, 27: 237-240

[2] Chandrasekaran S, Kumar D. Dynamic response of tension leg platform with tuned mass dampers. Journal of Naval Architecture and Marine Engineering, 2013, 10: 152-157

[3] Chatterjee T, Chakraborty S. Vibration mitigation of structures subjected to random wave forces by liquid column dampers. Ocean Engineering, 2014, 87: 151-161

[4] Den Hartog J. Mechanical vibration, 1956, 4th Ed., New York: McGraw-Hill

[5] Fujino Y, Sun L. Tuned liquid dampers (TLD) for suppressing horizontal motion of structures. ASCE Journal of Engineering Mechanics, 1992, 118(10): 2017-2030

[6] Gao H, Kwok K. Optimization of tuned liquid column dampers. Engineering Structures, 1987, 19(6): 476-486

[7] Gharabaghi A, Mohasel M (2019) Seismic control of offshore steel jacket platform using tuned liquid column damper. International Institute of Earthquake Engineering and Seismology (IIEES). SEE08_450

[8] Ha M, Cheong C. Pitch motion mitigation of spar-type floating substructure for offshore wind turbine using multilayer tuned liquid damper. Ocean Engineering, 2016, 116: 157-164

[9] Housner GW. Dynamic pressures on accelerated fluid containers. Bulletin of the Seismological Society of America, 1957, 47(1): 15-35

[10] Kareem A, Sun W. Stochastic response of structures with fluid-containing appendages. Journal of Sound and Vibration, 1987, 21: 389-408

[11] Lee HH. Stochastic analysis for offshore structures with added mechanical dampers. Ocean Engineering, 1997, 24(9): 817-834

[12] Lotfollahi-Yaghin M, Ahmadi H, Tafakhor H (2016) Seismic response of an offshore jacket-type platform incorporated with tuned liquid dampers. Advances in Structural Engineering 1–12, https://doi.org/10.1177/1369433215624340

[13] Lu Z, Wang D, Zhou Y. Experimental parametric study on wind-induced vibration of particle tuned mass damper on a benchmark high-rise building structure design of tail and special buildings. Journal of Tall & Special Buildings, 2017, 26(8): e1359

[14] Modi V, Welt F (1987) Vibration control using nutation damper. International Conference on Flow-Induced Vibration, UK

[15] Nekooei M, Ziyaeifar M. Vertical seismic isolation of structures. JApSc, 2018, 8(2): 4656-4661

[16] Sun L, Fujino Y, Chaiser P. Modeling of tuned liquid damper (TLD). Journal of Fluids and Structures, 1992, 41–44: 1883-1894

[17] Tan JY, Hu JJ. A prediction model for vertical-to-horizontal spectral ratios of ground motions on the seafloor for moderate magnitude events for Sagami Bay region. Journal of Seismology, 2021, 25: 181-199

[18] Wu G, Ma Q, Eatock Taylor R. Numerical simulation of sloshing waves in a 3D tank based on finite element method. Applied ocean research, 1998, 20: 337-355

[19] Wu Q, Zhao XL, Zheng RC, Minagawa K (2016) High response performance of a tuned-mass damper for vibration suppression of offshore platform under earthquake loads. Hindawi Publishing Corporation Shock and Vibration, Vols. Volume 2016, Article ID 7383679, 11 pages. https://doi.org/10.1155/2016/7383679

[20] Zhang Z, Høeg C. Vibration control of floating offshore wind turbines using liquid column dampers. Journal of Physics, 2018, 1037: 032002

[21] Zhao B, Gao H, Wang Z, Lu Z. Shaking table test on vibration control effects of a monopile offshore wind turbine with a tunned mass damper, wind energy. Journal of Wind Energy, 2018, 21(12): 1309-1328

[22] API RP 2A - Recommended Practice for Planning, Designing, and Constructing Fixed Offshore Platforms