Dynamic behaviour of suction caissons

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xii Contents D.2.2 Structure of the global dynamic stiffness matrices . . . . . . . . . . 157 D.3 Direct analysis of the steady state response for lumped-parameter models 161 Morten Liingaard
List of Figures 1.1 Concepts for offshore wind turbine foundations at relatively shallow waters. From left to right: Gravity based, suction caisson, monopile and tripod foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Gravity based foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Monopile foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.4 Tripod foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.5 Suction caisson. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Image (a) and geometry (b) of the suction caisson . . . . . . . . . . . . . 13 2.2 Degrees of freedom for a rigid surface footing: (a) displacements and rotations, and (b) forces and moments. . . . . . . . . . . . . . . . . . . . . . 16 2.3 BE/FE models of (a) surface foundation and (b) suction caisson . . . . . 19 2.4 Vertical dynamic stiffness for a surface foundation calculated by two different BE/FE models. The numerical results are compared with a known analytical solution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.5 Vertical dynamic stiffness: variation of Poisson’s ratio. H/D = 1, G s = 1.0 MPa and η s = 5% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.6 Vertical dynamic stiffness: variation of soil stiffness. H/D = 1, ν s = 1/3 and η s = 5% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.7 Vertical dynamic stiffness: high frequency behaviour. G s = 1.0 MPa, ν s = 1/3 and η s = 5%. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2.8 Vertical dimensionless damping coefficient ˜c V V . G s = 1.0 MPa, ν s = 1/3 and η s = 5%. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2.9 Solution for an infinite cylinder subjected to dynamic vertical excitation in the axial direction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.1 Degrees of freedom for a rigid surface footing: (a) displacements and rotations, and (b) forces and moments. . . . . . . . . . . . . . . . . . . . . . 33 3.2 Geometry (a) and BE/FE model (b) of the suction caisson. . . . . . . . . 34 3.3 Infinite hollow cylinder (a) and two-dimensional BE/FE model (b) of the cylinder where Ω i and Ω o are the inner and outer boundary element domains, respectively. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.4 Torsional impedance: variation of skirt length. G s = 1.0 MPa, ν s = 1/3 and η s = 5%. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 — xiii —
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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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Dynamic behaviour of suction caissons

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