The formula for calculating the stiffness of Jacket Type Offshore Platforms with non-grouted vertical piles has been proposed in this paper. It is shown that the excessive vibration of Jacket Type Offshore Platforms with non-grouted vertical piles had been aroused by unexpected change of structural stiffness as well as the impact between the conductor and piles as a result of seabed scouring. The proposal is that Jacket Type Offshore Platforms with vertical piles should be grouted in order to prevent from excessive vibrations as seabed scouring. Otherwise, a varied model should be taken to modeling serviceability state of them.
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