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By R. Rautmann

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Andersen & Jostad 2004). Compartments with trapped water between ring stiffeners will also be potential drainage channels that need to be considered in cases with significant long term loads. Retrieval. Anchors may have to be extracted at the end of their service life or due to installation problems. Set-up factors must then be established for both outside and inside interface skirt strength for times different from the time used in the capacity analyses. It should also be noted that set-up factors that are conservative (low values) for capacity will not be conservative for retrieval.

G. cyclic T-bar tests). Bearing capacity factors, Nc. Bearing capacity factors should be determined for different geometries and boundary conditions of internal stiffeners and external protuberances to resolve the differences in bearing capacity factors used by the various predictors. Installation friction in carbonate soils. Further studies should be made to understand the interface shear strength during installation in carbonate rich soils, both in terms of the radial effective stress and the appropriate interface friction angle.

The installation of a suction anchor must be monitored to make sure that the installation proceeds as expected and that the anchor is installed as designed. The measurements should include penetration depth, applied underpressure, penetration rate, plug heave, tilt, and orientation. The lowering speed at time of touch-down at the sea bottom can be critical, in particular for large caissons with relatively limited top venting for water evacuation. It is strongly recommended that underpressure during installation should be monitored inside the anchor, rather than within the pumping unit, in order to avoid errors due to pipe losses and Venturi effects.

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Approximation Methods for Navier-Stokes Problems: Proceedings by R. Rautmann

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