Numerical predictions for centrifuge model tests of suction bucket foundation on liquefiable seabed
Authors
Estepa Palacios, Alfonso ; Nguyen, Duy Manh ; Markovic, Vladimir
Term
4. term
Education
Publication year
2021
Submitted on
2021-06-10
Pages
209
Abstract
This thesis addresses the need for safe and cost-effective foundation solutions for offshore wind in seismic areas where liquefaction can undermine the bearing capacity of sandy seabeds. It aims to develop and validate a numerical model in OpenSees capable of predicting the outcomes of a centrifuge test of a wind turbine prototype founded on a suction bucket placed on a liquefiable seabed. The model represents soil–foundation interaction and employs the PDMY01 and PM4Sand constitutive soil models. It is calibrated and validated against centrifuge measurements, including excess pore water pressure generation, settlements, and accelerations. After validation, numerical predictions are performed by varying the applied dynamic loading and key structural characteristics to assess their influence on system response. The work provides a modeling framework to support understanding of suction bucket foundation behavior during earthquakes on liquefiable seabeds and outlines limitations and directions for future research. Specific quantitative findings beyond the validation are not provided in the present excerpt.
Denne afhandling adresserer behovet for sikre og omkostningseffektive funderingsløsninger til havvind i seismiske områder, hvor liquefaktion kan svække sandbundens bæreevne. Formålet er at udvikle og validere en numerisk model i OpenSees, der kan forudsige resultaterne af en centrifugetest af en vindmølleprototyp med et suction bucket-fundament på en liquefierbar havbund. Modellen repræsenterer samvirket mellem jord og fundament og anvender de konstitutive jordmodeller PDMY01 og PM4Sand. Den kalibreres og valideres mod eksperimentelle målinger fra centrifugetesten, herunder udvikling af overskydende porevandstryk, sætninger og accelerationer. Efter validering udføres numeriske forudsigelser, hvor både den påførte dynamiske last og udvalgte strukturelle egenskaber varieres for at belyse deres indflydelse på systemets respons. Arbejdet bidrager med en modelleringsramme, som kan støtte forståelsen af suction bucket-fundamenters opførsel under jordskælv på liquefierbare havbunde, og peger på begrænsninger og muligheder for fremtidigt arbejde. Konkrete kvantitative resultater ud over valideringen er ikke angivet i det foreliggende uddrag.
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