Dynamic behaviour of suction caissons

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viii Morten Liingaard
Contents 1 Introduction 1 1.1 Offshore wind turbines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Foundations for offshore wind turbines . . . . . . . . . . . . . . . . . . . . 2 1.2.1 Gravity based foundations . . . . . . . . . . . . . . . . . . . . . . . 4 1.2.2 Monopile Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.3 Tripod Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.4 Suction caissons . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.3 Need for further research . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4 Research aims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4.1 Evaluation of the frequency dependent stiffness of suction caissons 9 1.4.2 Experimental estimation of resonance frequencies . . . . . . . . . . 9 1.4.3 Formulation and implementation of lumped-parameter models . . 9 1.5 Thesis outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 Dynamic stiffness of suction caissons—vertical vibrations 11 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Analysis methods for dynamic soil-structure interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3 Boundary element/finite element formulation . . . . . . . . . . . . . . . . 13 2.3.1 Boundary element formulation . . . . . . . . . . . . . . . . . . . . 13 2.3.2 Coupling of FE and BE regions . . . . . . . . . . . . . . . . . . . . 15 2.4 Static and dynamic stiffness formulation . . . . . . . . . . . . . . . . . . . 16 2.5 Benchmark tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.5.1 Verification of the vertical static stiffness . . . . . . . . . . . . . . 17 2.5.2 Reproduction of the vertical dynamic stiffness of a surface footing 18 2.6 Dynamic stiffness for vertical vibrations . . . . . . . . . . . . . . . . . . . 22 2.6.1 Vertical dynamic stiffness—variation of Poisson’s ratio . . . . . . . 23 2.6.2 Vertical dynamic stiffness—variation of soil stiffness . . . . . . . . 23 2.6.3 Vertical dynamic stiffness—high-frequency behaviour . . . . . . . . 23 2.7 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2.8 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 — ix —
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76 BIBLIOGRAPHY Brincker, R. and P.
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78 BIBLIOGRAPHY Kitahara, M. (1984)
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80 BIBLIOGRAPHY Morten Liingaard
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82 BIBLIOGRAPHY Morten Liingaard
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84 Appendix A - Solution for an inf
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Dynamic behaviour of suction caissons

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