The Effect of Corrosion Phenomena Coincide with Changes in Environmental and Boundary Conditions of SPD1 Jacket Platform's Elements, in the Process of Changing the Natural Vibration Frequencies

Jacket platforms are constantly exposed to harsh environmental conditions, so it seems necessary to assessment of existing platforms for various conditions and environmental factors. One of the most important factors is corrosion of steel elements of platforms at sea. In this research, effect of applying corrosion on members’ natural frequency changes is investigated. For this part of the study, some members with details of SPD1 members are assumed, and influence of corrosion on natural frequency changes, in two different conditions, under and out of water, with four support conditions, has been investigated.