EWEA Offshore 2015 – Copenhagen – 10-12 March 2015 The potential for structural optimization of the bucket foundation’s outer stiffeners is investigated using the commercial optimization software Tosca Structure. Results show that shape optimization of the initial design can reduce stress concentrations by 38%. Additionally, topology optimization has led to a new design concept with a mass reduction of 25% when compared to the initial design. A bucket foundation design has been provided by Universal Foundation A/S and is modelled using the finite element software Abaqus. The model assumes fixed boundary conditions at the skirt (thereby neglecting soil interactions) and is loaded with an extreme static horizontal load at the top of the shaft. Both shape and topology optimization problems are then developed and solved using Tosca Structure. Shape Optimization