Static Wave Force Procedure for Platform Design

by John C. Heideman, Exxon Production Research Co, Houston, United States,
Timothy O. Weaver, Exxon Production Research Co, Houston, United States,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Oceans V

Abstract:

Since results from the Ocean Test Structure were presented at Civil Engineering in the Oceans IV in 1979, there have been numerous laboratory experiments and a few full-scale measurements of local and global wave forces on offshore platforms. The laboratory experiments have shed considerable light on such phenomena as current blockage within dense structures, wave and current shielding in conductor arrays, wave and current interaction, three-dimensional wave kinematics, and the effects of wake encounter, surface roughness, and cylinder orientation on C_d and C_m. From these data, an engineering procedure for calculating the static wave/current global load on a typical space frame structure has been synthesized and proposed for inclusion in the 20th edition of API-RP2A. This procedure is still grounded on the Morison equation for calculation of local forces and a higher-order regular wave theory for calculation of two-dimensional wave kinematics, but involves a sequence of simple modifications to the traditional methodology.

Subject Headings: Wave measurement | Wave forces | Water waves | Kinematic waves | Wave equations | Offshore structures | Ocean engineering

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