Effect of ground motion directionality on seismic dynamic responses of monopile offshore wind turbines

Mo, Renjie; Cao, Renjing; Liu, Minghou; Li, Miao

doi:10.1016/j.renene.2021.05.036

Cited by 42 publications

(6 citation statements)

References 54 publications

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“…This section of the paper provides typical analysis of commonly used foundation systems. The readers of the paper are referred to [30][31][32][33] for seismic analysis of hybrid foundations.…”

Section: Examples Of Typical Analysis Of Offshore Wind Turbine Systemsmentioning

confidence: 99%

Seismic Design of Offshore Wind Turbines: Good, Bad and Unknowns

et al. 2021

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Large scale offshore wind farms are relatively new infrastructures and are being deployed in regions prone to earthquakes. Offshore wind farms comprise of both offshore wind turbines (OWTs) and balance of plants (BOP) facilities, such as inter-array and export cables, grid connection etc. An OWT structure can be either grounded systems (rigidly anchored to the seabed) or floating systems (with tension legs or catenary cables). OWTs are dynamically-sensitive structures made of a long slender tower with a top-heavy mass, known as Nacelle, to which a heavy rotating mass (hub and blades) is attached. These structures, apart from the variable environmental wind and wave loads, may also be subjected to earthquake related hazards in seismic zones. The earthquake hazards that can affect offshore wind farm are fault displacement, seismic shaking, subsurface liquefaction, submarine landslides, tsunami effects and a combination thereof. Procedures for seismic designing OWTs are not explicitly mentioned in current codes of practice. The aim of the paper is to discuss the seismic related challenges in the analysis and design of offshore wind farms and wind turbine structures. Different types of grounded and floating systems are considered to evaluate the seismic related effects. However, emphasis is provided on Tension Leg Platform (TLP) type floating wind turbine. Future research needs are also identified.

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Section: Examples Of Typical Analysis Of Offshore Wind Turbine Systemsmentioning

confidence: 99%

Seismic Design of Offshore Wind Turbines: Good, Bad and Unknowns

et al. 2021

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“…Although the onshore type is more easily accessible than ofshore wind power, the precise selection of installation location, which ensures sufcient wind speed, the efect on surface air patterns, and its sound pollution, which impacts human health and activity, are challenging problems in onshore wind farms. Due to faster and stronger wind over the water and considering the mentioned challenges, ofshore wind farms have been highly regarded in recent years [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Offshore Wind Turbine with a New Monopile Foundation under Different Lateral and Seismic Loadings

Ebadi-Jamkhaneh,

Kontoni

2024

Shock and Vibration

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Using a monopile foundation due to a reliable and simple technology has a wide application in engineering structures. This paper investigates numerically the performance of an offshore wind turbine with a monopile foundation equipped with a restriction plate at a middle inside height of the monopile under the wind, wave, and seismic loadings. Different parameters, including wind velocity, wave period, wave height, soil characteristics, and combination of loadings, are considered in nonlinear finite element dynamic analyses. Results are given in terms of the distribution of displacement and bending moment over the turbine height and frequencies. The results reveal that by increasing the wind velocity, the responses of the tower increase, and the wind load acting on the hub has the most important effect on the turbine behavior rather than the wind load acting on the tower body. Furthermore, the values of maximum displacement and bending moment under wind and wave loading decrease with the increase of the shear strength of the soil, whereas the responses of the tower under earthquake loading increase. Generally, it is necessary to consider the effect of a combination of wind, wave, and earthquake loadings on the design of the turbine tower.

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“…Therefore, their application is very helpful in reducing the cost of wind power. However, many nearshore water areas, such as the east coast of China and the west coast of the USA, are seismically active areas (Mo et al, 2021). In the event of an earthquake, the vigorous ground motion will not only cause strong vibration of the offshore wind turbine (OWT) structures, leading to their fatigue and damage to them (Lombardi et al, 2013;Kim et al, 2014), but also may cause the liquefaction of saturated seabed soil around the fixed foundation of an OWT, lowering the load-bearing capacity of the foundation and thus threatening the safety of the turbine (Patra and Haldar, 2021a;.…”

Section: Introductionmentioning

confidence: 99%