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Single point Anchor Reservoir (SPAR) platforms is a kind of floating platforms that are used in deep waters. These are mainly used for deep water applications for drilling, production, processing, storage and offloading of ocean deposit. The offshore spar platform is modelled as a rigid body with six degrees-of-freedom (DOFs), connected to the sea bed by multicomponent catenary cables which consist of a mooring line. The numerical model is generated in ANSYSAQWA along with the wave actions on the structure. The response analysis is performed in frequency domain applying unidirectional regular wave model is used for computing the incident wave kinematics by Airy's wave theory, irregular wave model is used for computing the incident wave kinematics by JONSWAP spectrum and hydrodynamic force by Morison's equation and Froude-Kryvol wave forces. The heave motion of a floating structure is critical, the heave response can be suppressed by installing heave plates. This paper study about the response analysis of SPAR platform for five different configurations without and with lower heave plates of five different heave plate diameters (1.1,1.2,1.3,1.4&1.5 times the diameter of SPAR hull). Keywords— Single Point Anchor Reservoir (SPAR), Heave damping plates, ANSYS AQWA, Irregular wave model

HEAVE DAMPING EFFECTS DUE TO CIRCULAR PLATES ATTACHED AT KEEL TO SPAR HULL