Wind Loads
Wind loads produce two different effects on vessels. The primary effect is an equivalent static force from the maximum expected wind velocities, which causes lateral shears and overturning moments. The other effect is wind-induced vibration caused by vortex shedding in a steady state wind.
Section 100 of the Civil and Structural Manual outlines procedures for determining the static wind loads, and critical wind velocities at which vessel vibrations may occur.
The following information is required to consider the effect of wind on the design of a vessel:
• Design wind speed for the facility
• Exposure category
• Vessel diameter, height or length, wall thicknesses
• Mean steady state wind velocity at the site
• Attachments to the vessel that affect the shape coefficient
• Operating weights of vessel (both pre-service and in-service)
The design wind speed, exposure category, and shape coefficients are all given in Section 100 of the Civil and Structural Manual. Using this information and following the procedure and examples will help the vessel designer calculate the forces on the vessel and supports due to wind.
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