Statics For Dummies
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When working submerged surface problems in statics, remember that all submerged surfaces have a fluid acting upon them, causing pressure. You must compute two pressures: the hydrostatic pressure resultant and the fluid self weight.

  • Hydrostatic pressure resultant: The hydrostatic pressure resultant acts horizontally at 0.333z (z is the depth of the fluid) from the bottom of the pressure distribution.

  • Fluid self weight: The fluid self weight is

    acting downward at the centroid (geometric center) of the area of fluid.

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James H. Allen III, PE, PhD, is a registered professional engineer who teaches courses in the areas of statics, mechanics, structural engineering, and steel design.

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