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Wave And Wind Actions On Offshore Structures

Offshore structures are highly susceptible to environmental loads induced by wind, water, and current. An accurate determination of the environmental loads is a key part of the design of offshore structures.

The complexity of wave and structure interaction and the probabilistic nature of waves, make the task of determining design loads very complicated. This means that the design loads are usually determined either through extensive use of codes and standards, through model tests, or through the use of advanced theoretical models and a probabilistic treatment. Svend Ole Hansen ApS and SOH Wind Engineering have developed accurate design tools to determine the wave and structure interaction related to vortex-induced vibrations.

SOH Wind Engineering offers consultancy services in all areas concerning wind actions on offshore structures. Dynamic effects are important due to the large wind loads on often light and slender offshore structures.

Apart from static and dynamic wind loads, aero elastic effects in form of vibrations induced by vortex shedding and galloping are also part of the service portfolio. The treatment of aero elastic effects requires, besides aerodynamic knowledge, thorough analyses and understanding of structural dynamics. The dynamics of slender girder structures, often found at offshore sites, may include advanced effects such as dynamic interaction between wind actions and machine-induced vibrations, parametric excitation, etc.

SOH Wind Engineering uses several tools for the structural and dynamic analysis of offshore structures. GT Strudl is used for linear finite element analysis, while Abaqus and Nastran are used for non-linear finite element analysis and other more complicated applications. The results obtained using different models are either validated by or based on actual measurements. Several of Svend Ole Hansen’s staff have taken relevant offshore safety courses and are able to attend offshore installations and perform measurements with very short notice.