Abstract
The free vibration and the dynamic analyses for studying the response of a fixed offshore tower have been performed by using four different models of the same by idealising it as a frame as well as a truss. These models basically differ in the total degrees-of-freedom considered. The shear deformation and rotary inertia effects have been studied in the eigenvalue problem of the tower where both lumped mass and consistent mass formulation have been used. The dynamic response has been obtained by modal analysis in conjunction with Newmark's method. The first few natural frequencies, the deck reflection and the maximum axial force in the member have differed only marginally between the models. The maximum stress obtained from the frame model is much higher than the corresponding truss model however.
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