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<br /> <br />Chapter VI: General Design Practices <br />Elevation <br /> <br />Elevation Sample Calculation <br /> <br />First Floor Including Lower Level: <br />Area = 60 x 30 = 1800 ft2 <br /> <br />Oak Floor <br />Subfloor <br />Joists <br />1nsula1ion <br />Mise <br />Ceiling <br />Walls <br />1801fext. <br />157lfint. <br />2851flower level <br /> <br />Subtotal <br /> <br />1800 ft2( 4 pst) <br />1800 ft2(3 pst) <br />1800 ft2( 4 pst) <br />1800 ft2( 5 pst) <br />1800 ft2(3 pst) <br />1800 ft2(2.5 pst) <br /> <br />(4' trib.Xl8 pst) <br />(4' trib. X20 pst) <br />(4' trib,)(50 pst) <br /> <br />= 7,200 Ibs <br />= 5,400 Ibs <br />= 7,200 Ibs <br />= 9,000 Ibs <br />= 5,400 Ibs <br />= 4,500 Ibs <br /> <br />= 12,960 Ibs <br />= 12,560 Ibs <br />= 57,000 Ibs <br /> <br />WI = 121,220 Ibs <br /> <br />Total Weight, W=Wl + W2 =205,190 Ibs= 205 kips <br /> <br />Compare Buoyancy Foree Against Structure Weight <br /> <br />DL => 1.5 Fb <br />205,190 Ibs <= 1.5 (449,280) <br />205,190 Ibs < 673,920 Ibs <br /> <br />Therefore, buoyancy forces control and the building (if dry floodproofed) will float during flood <br />events, unless structural measures, such as floor anchors or additional slab mass, or non- <br />structural measures such as allowing the lower level to flood, are utilized to offset/equalize the <br />buoyancy forces, <br /> <br />In our example, since buoyancy controls and the magnitude of the project represents a substan- <br />tial improvement, the homeowner is required to allow the lower level to flood by incorporating <br />vent openings in the foundation wall. While this action will equalize hydrostatic pressures on the <br />foundation walls, hydrodynamic and impactforces will still apply. <br /> <br />70f44 <br /> <br />VI - E.52 <br /> <br />Engineering Principles and Practices of Retrofitting Flood-Prone Residential Structures <br />__ January 1995 <br />