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<br />Elevation Sample Calculation Step 1: Calculate Vertical Loads <br /> <br />Elevation Sample Calculation <br /> <br />Calculations: <br /> <br />Step 1: <br /> <br />Calculate vertical flood loads <br /> <br />The calculation of buoyancy forces and comparison with structure weight is a critical detennina- <br />tion of this problem. While buoyancy of the first floor is not an issue (since it is elevated four <br />feet above the BFE), buoyancy of the entire structure (slab, fowulation walls, and superstruc- <br />ture) must be checked if dry floodproofing is being considered for the lower level. Ifbuoyancy <br />forces contro~ dry flood proofing of the lower level is not applicable. <br /> <br />Calculate Buoyancy Forces (from Formula IV -8) <br /> <br />Fb =yAH = (62.4lbs/ft3)(30 ft x 60 ft)(4 ft) =449,280 lbs <br /> <br />Calculate Structure Weight by Level <br /> <br />Tabulate Dead Loads by Floor <br /> <br />Roof: <br />Shingles - Asphalt - I layer <br />Felt <br />Plywood - 32/16 - 112 inch <br />Trusses @ 16 inches o,c. <br />2x6 Top Chord <br />2x4 Web and Bottom <br /> <br />2,0 psf <br />O,7psf <br />1.5 psf <br />5.0psf <br /> <br />Total <br /> <br />9,2 psf(Root) <br /> <br />40f44 <br /> <br />Engineering Principles and Practices of Retrofitting Flood-Prone Residential Structures <br />January 1995 __ <br /> <br />VI - E.49 <br />