Geotechnical Aspects of Offshore Wind Turbine Dynamics Emerging from 3d Sand-Monopile Non-Linear Simulations

In recent years, offshore wind is becoming an increasingly growing market in Europe. Many resources are allocated towards ensuring its sustainable progress while one of the biggest uncertainties encountered lays in the offshore wind turbine's (OWT) foundations. In Europe, monopiles are the most widely adopted solution to found such structures in...

The effect of vibrations on the pull-out resistance of a steel wire rope buried in a sand body: A small scale experimental approach

A landfall operation is conducted whenever a pipeline reaches the shore, during this operation the pipeline is pulled onto shore with the help of a steel wire rope. Allseas engineering has experienced several cases of landfalls during which the friction forces along the steel wire rope rose to excessively high levels. These cases occurred at...

Implementation and inspection of a high-cycle accumulation model

The prediction of permanent deformation accretion in granular materials as a result of long-term cyclic loading is a complex challenge that receives great attention in engineering fields, including infrastructural design and design of offshore wind turbines. Many models have been proposed in the past which aim to predict this cyclic deformation...

Permanent frame tilt in a submarine pressure hull due to cyclic tank pressure on a wing bulkhead with allowance for ratcheting

Only abstract available due to confidentiality

Long Term Effects of Cyclic Loading on Suction Caisson Foundations

Significant financial investments are made in the offshore wind energy, in a race to reduce greenhouse gas emissions. The trend is to install larger capacity wind turbines in deeper waters, further from shore. DTI (2001) states that 30% of this investment is represented by the foundation costs. Senders (2008) and Byrne & Houlsby (2003) found...

Bucket Foundation in Clay for OWT Subjected to Combined Cyclic Loads

This thesis project investigates the bucket foundation in clay subjected to cyclic loads. The cyclic irregular loading history in this thesis was represented by the equivalent number of cycles Neq with a certain level of cyclic to average stress ratio tcy / ta which can be derived using cyclic shear strain accumulation procedure developed in NGI...

One-Dimensional Viscoelastic Simulation of Ice Behaviour in Relation to Dynamic Ice Action

The goal of this work was to simulate the behaviour of ice under cyclic loading. The linear viscoelastic Kelvin, Maxwell and Burgers models were implemented in Matlab by means of The Boltzmann superposition principle. This method was verified using cases which could be represented by analytical solutions. During the extensive sensitivity...

The Gevelco quay wall: Research into the causes of the measured displacements

In this thesis, an investigation is described to the measured horizontal displacements of a quay wall in the Port of Rotterdam. This quay wall was built in 2003 to replace an existing jetty. A combined tubular wall was installed and some of the concrete jetty piles were reused as foundation piles for the relieving platform. Anchorage for the...