Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Scour and scour protection effects on monopiles for Offshore Wind Turbines
This thesis analyses the effects of scour and scour protection on the response of monopile foundations for Offshore Wind Turbines. These structures are exposed to a variety of environmental hazards: wind, waves, currents, and morphological changes of the seabed. The latter, scour, might considerably reduce the embedment length of Offshore Wind Turbines founded on monopiles, decreasing the lateral bearing capacity and increasing the structure’s cumulative displacements under long-term cyclic loading. Moreover, scour may also induce changes in the structure’s natural frequency. This geohazard is often disregarded from the point of view of the geomechanical soil-structure-interaction. This thesis aims to investigate how scour and scour protection affect the static lateral capacity, the cyclic response, and natural frequencies. Computational Fluid Dynamics are implemented to estimate the hydrodynamic-dependent scour morphology, which is then used for monopile analysis. To this end, the Finite Elements technology is applied to simulate a variety of loading scenarios, from monotonic lateral loads to cyclic loads. A parametric study of different scour and scour protection parameters is conducted with respect to the dimensions and material properties. To simulate the long-term strain accumulation with load cycles, a hypoplastic constitutive law is implemented to reproduce the sand behaviour. Through these simulations, the ratcheting phenomenon based on increasing deformations with the number of cycles is simulated for sandy soils. This thesis contributes to the understanding of the soil’s response and monopile behaviour when exposed to scour and scour protection. It shows and quantifies the risk that scour poses to Offshore Wind Turbines in an active marine environment. Furthermore, it highlights the potential of scour protection and assesses its applicability and performance for Offshore Wind Turbines.
Scour and scour protection effects on monopiles for Offshore Wind Turbines
This thesis analyses the effects of scour and scour protection on the response of monopile foundations for Offshore Wind Turbines. These structures are exposed to a variety of environmental hazards: wind, waves, currents, and morphological changes of the seabed. The latter, scour, might considerably reduce the embedment length of Offshore Wind Turbines founded on monopiles, decreasing the lateral bearing capacity and increasing the structure’s cumulative displacements under long-term cyclic loading. Moreover, scour may also induce changes in the structure’s natural frequency. This geohazard is often disregarded from the point of view of the geomechanical soil-structure-interaction. This thesis aims to investigate how scour and scour protection affect the static lateral capacity, the cyclic response, and natural frequencies. Computational Fluid Dynamics are implemented to estimate the hydrodynamic-dependent scour morphology, which is then used for monopile analysis. To this end, the Finite Elements technology is applied to simulate a variety of loading scenarios, from monotonic lateral loads to cyclic loads. A parametric study of different scour and scour protection parameters is conducted with respect to the dimensions and material properties. To simulate the long-term strain accumulation with load cycles, a hypoplastic constitutive law is implemented to reproduce the sand behaviour. Through these simulations, the ratcheting phenomenon based on increasing deformations with the number of cycles is simulated for sandy soils. This thesis contributes to the understanding of the soil’s response and monopile behaviour when exposed to scour and scour protection. It shows and quantifies the risk that scour poses to Offshore Wind Turbines in an active marine environment. Furthermore, it highlights the potential of scour protection and assesses its applicability and performance for Offshore Wind Turbines.
Scour and scour protection effects on monopiles for Offshore Wind Turbines
Menéndez Vicente, Carlos (Autor:in)
28.02.2025
Doctoral thesis, UCL (University College London).
Hochschulschrift
Elektronische Ressource
Englisch
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