Elasto-plasticity Analysis
Constitutive models for soil using "hperplasticity"
One of the most promising sources is wind energy which can provide electrical power using wind turbines. The increase in the use of this type of energy requires greater consideration of design, installation and especially the cost of offshore wind turbines. This project will discuss the modelling of a novel type of shallow foundation for wind turbines under combined loads. The combined loads applied to this footing will be in three-dimensional space, with six degrees of freedom of external forces due to environmental conditions. This project aims to develop a novel model for plasticity theory which includes an experimentally determined single yield function is used to model the effects of combined cyclic loading of a circular footing on the behaviour of both sand and clay. The model is developed from a single-yield-surface model to a continuous plasticity model (with an infinite number of yield surfaces) and then is discretized to a multiple-yield-surface model which can be implemented by numerical calculation to be able to capture with reasonable precision the hysteretic response of a foundation under cyclic loading. This can not be described by a conventional single-yield-surface model.
This project will corporate with Prof. Guy Houlsby and Dr L Nguyen-Sy (a former student of Prof. Houlsby)
References
- Nguyen-Sy, L. (2005). The theoretical modelling of circular shallow foundation for offshore wind turbines (Doctoral dissertation, University of Oxford).
- Nguyen-Sy, L. and Houlsby, G. T. (2005). The theoretical modelling of a suction caisson foundation using hyperplasticity theory. Frontiers in Offshore Geotechnics II, Perth, 417.