Horizontal Ring Girders

Ring girders are typically used in elevated vessels when they are supported by a structural frame. The stress distribution in a ring girder is very complicated. Given a uniform load around the perimeter, the stresses and forces can be calculated given the following assumptions:

• Supports equally spaced
• Vertical deflection at supports is zero
• Slope of ring girder at supports is zero due to symmetry of loads and supports
• Torsion force at supports is zero. This inherently assumes the girder is able to twist as a result of the flexibility of the shell.

Even given these simplifying assumptions, the exact design of a ring girder is beyond the scope of this manual, and the designer is referred to qualified specialists.

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