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<br /> <br />The following design conditions were used in calculating the data provided in Tables 4.13 - 4.16 <br />Df = 20 psf <br />Ff = 40 psf <br />Wf = 15 and 25 psf <br />W = 12 and 14 ft. <br />f = 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, <br />and 240 in. <br />d = 31/2, 5V2, 7V2, 9V2, and 11 V2 in. (square members) <br />d = 4, 6, 8, 10, and 12 in. (round members) <br />e = 37V2, 46 and 49% in." for W = 12 ft. and a = 99 in., 82 in., and 75V2 in, respectively <br />e = 49V2, 58, and 61 % in." for W = 14 ft. and a = 99 in., 82 in., and 75V2 in. respectively <br />'Includes 30 in. additional width to allow for clearance between manufactured home <br />side and vertical member. <br />F'b = 915 psi = [(800 psi) X (1.33 duration) X (0.86 moisture)] <br />, E = 1,000,000 psi <br />ex = 1.00 <br />h = 9.75 ft. <br /> <br />Horizontal Support Beams <br /> <br />The application of the vertical member loads to the elevated foundation requires that the horizontal <br />support beams be capable of sustaining the anticipated loading. The recommended horizontal beam <br />size is determined as follows. <br /> <br />Min. Sx <br /> <br />= (Fr)(e) <br />F'b <br /> <br />or <br /> <br />(Fw)(e) <br />F'b <br /> <br />whichever is greater <br /> <br />Where: <br />Sx = (b)(d)2 (in3) <br />{5 <br /> <br />Fr = Vertical force (Table 4.10) <br />or <br />Fw <br /> <br />e = Distance from I-beam to vertical member (in) <br /> <br />Fb = bending stress of wood (psi) <br /> <br />Subsequent to a determination of the minimum Sx required for each design condition, the required <br />size and number of horizontal beams can be found. <br />The following values were used in this calculation. <br /> <br />Fr = Forces provided in Table 4.10 for the loads, and design dimensions shown <br />or <br />Fw <br /> <br />e = 371/2, 46 and 49% in." for w = 12 ft. and a = 99 in., 82" and 75V2 in. respectively <br /> <br />e = 49'/2,58 and 61% in." for w = 14 ft. and a = 99 in., 82 in., and 75V2 in. <br />respectively <br /> <br />"Includes 30 in. additional width to allow for clearance between manufactured home <br />and vertical member. <br /> <br />F'b = 1207.5 psi = [(1250 psi)(1.15 duration)(0.84 vertical bending)] <br /> <br />93 <br />