On the seismic analysis and design of offshore wind turbines

Bhattacharya, Subhamoy; Risi, Raffaele De; Lombardi, Doménico; Ali, Ahmer; Demirci, Hasan Emre; Haldar, Sumanta

doi:10.1016/j.soildyn.2021.106692

Cited by 18 publications

(12 citation statements)

References 12 publications

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“…Note that the eigenvalue analysis is linear and only the initial stiffness of the soil spring is used; therefore, the computed natural frequency is momentary and does not reflect the state during seismic shaking or liquefaction (Bhattacharya, 2019;Mo et al, 2017). In Cases A and B, post-scour f1 fell into the f1P±10% range (f1P=0.14-0.3 Hz for the 3 MW turbine investigated here) (Bhattacharya et al, 2021) when Sd was greater than 0.8Dop and 0.9Dop, respectively, causing resonance with the turbine rotation. The post-scour f1 could cause resonance with the turbine rotation in Case C for all the scour depths examined.…”

Section: Effects Of Scour Depth On Natural Frequencies Of Owtmentioning

confidence: 97%

Evaluation of vertical effective stress and pile tension capacity in sands considering scour-hole dimensions

Lin

Jiang

2019

Computers and Geotechnics

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Section: Effects Of Scour Depth On Natural Frequencies Of Owtmentioning

confidence: 97%

Evaluation of vertical effective stress and pile tension capacity in sands considering scour-hole dimensions

Lin

Jiang

2019

Computers and Geotechnics

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“…Following the work of [6,17], the main issues that must be addressed in the seismic design process of an offshore wind turbine are summarized as follows:…”

Section: Main Challenges In Seismic Design Of Offshore Wind Turbinesmentioning

confidence: 99%

“…Typical return periods of large earthquakes may be greater than 500 years. Offshore wind turbines are currently designed for a lifespan up to 30 years [17]. Therefore, it is necessary to assess and manage the seismic risk within the design life of the structure.…”

Section: Design Return Periodmentioning

confidence: 99%

“…Most existing standard of practices for ordinary structures use a 475-year return period. The design return period corresponds to a 10% probability of exceedance in 50 years [17], where the assumed lifespan of a typical structure is taken as 50 years. The 475-year return period has an approximately 5% probability of exceedance when the time window of 50 years is shortened to 25 years.…”

Section: Design Return Periodmentioning

confidence: 99%

“…Main loading conditions to be considered for offshore wind turbines in regions prone to seismic events (modified from [17]).…”

Section: Figure 12mentioning

confidence: 99%

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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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Hazard considerations in the vulnerability assessment of offshore wind farms in seismic zones

Bhattacharya

Amani

Prabhakaran

et al. 2022

Earthquake Engineering and Resilience

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Offshore wind power is increasingly becoming a mainstream energy source, and efforts are underway toward their construction in seismic zones. An offshore wind farm consists of generation assets (turbines) and transmission assets (substations and cables). Wind turbines are dynamically sensitive systems due to the proximity of their resonant frequency to that of loads considered in their analyses. Such farms are considered lifeline systems and need to remain operational even after large earthquakes. This study aims to discuss hazard considerations involved in the resilience assessment of offshore wind farms in seismic regions. The complexity of design increases with larger turbines installed in deeper waters, resulting in different types of foundations. In addition, Tsunami inundation is shown to be an important consideration for nearshore turbines.

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On the seismic analysis and design of offshore wind turbines

Cited by 18 publications

References 12 publications

Evaluation of vertical effective stress and pile tension capacity in sands considering scour-hole dimensions

Evaluation of vertical effective stress and pile tension capacity in sands considering scour-hole dimensions

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

Hazard considerations in the vulnerability assessment of offshore wind farms in seismic zones

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