Marine structure

A marine structure comprising a base which is intended to be founded to the sea bed, at last one elastic prestressed column which is rigidly fixed to and extending up from the base and a buoyant, rigid structure comprising a submerged part and a part projecting up above the sea level to support a deck superstructure, the lower end of the submerged part being rigidly fixed to the upper end of the at least one elastic, prestressed column, the cross sectional area of the at least one elastic, prestressed column being substantially smaller than the cross sectional area of said lower end of the submerged part and the dimensions and elasticity of said column being such as to produce a first natural period of the complete installed structure which is longer than the significant exciting wave periods whereby said column will deflect in a curved manner when the buoyant rigid structure is subjected to environmental forces and the main structure will oscillate about its vertical equilibrium when subjected to waves and wind, thereby behaving as an articulated tower.