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<br />The vertical member load, based on wind load, <br />roof live load, home width, dead and floor live <br />loads, and the longitudinal spacing of vertical <br />supports, is derived from Table 4.10. For the <br />manufactured home installation in this example, <br />the load is 4,640 pounds per vertical member as <br />shown in Figure 4.37. <br />Referring to Table 4.16 on vertical member <br />capacity, it is found a 12-inch diameter round or <br />square post is acceptable based on the vertical <br />member capacity and length of 11 feet (five feet <br />above grade plus six feet embedment) as shown <br /> <br />in Figure 4.38. <br />Because the vertical member load in psf is <br />greater than the soil bearing capacity of 3,000 psf, <br />a bearing pad must be provided for each post. The <br />minimum area is as follows: <br /> <br />'4640 lb. _ 1 55 It <br />_ . sq. . <br />3000 psf <br /> <br />Note that in this example, if a 12 inch square <br />member were chosen a vertical member length <br /> <br />Table 4.15 <br />, 1 <br />VERTICAL MEMBER CAPACITY (pounds per member) <br /> <br />Wind Design = 25 psf <br />Hane Width = 12 feet <br /> <br /> Vertical Member Diameter (in. ) <br /> Square3 Round4 <br />Length2 <br />(ft. ) 4 6 8 10 12 4 6 8 10 12 <br />1 1657 5722 13071 24168 39323 1503 4630 10095 18250 29354 <br />2 929 3371 8027 15378 25798 831 2664 6013 11209 18523 <br />3 645 2389 5792 11277 19196 574 1870 4282 8088 13530 <br />4 493 1850 4531 8902 15284 438 1440 3325 6326 10658 <br />S 399 1510 3720 7354 12697 354 1171 2717 5195 8791 <br />6 335 1273 3156 6264 10859 297 986 2297 4407 7481 <br />7 287 1101 2738 5456 9485 255 852 1990 3826 6511 <br />8 250 969 2418 4832 8421 223 749 1754 3381 5763 <br />9 221 865 2165 4333 7571 198 668 1568 3028 5170 <br />10 198 780 1959 3929 6876 178 603 1418 2740 4687 <br />11 178 710 1788 3593 6294 161 549 1293 2503 4287 <br />12 162 650 1645 3309 5804 147 503 1189 2304 3946 <br />13 149 597 1521 3067 5385 135 464 1100 2133 3658 <br />14 137 552 1414 2857 5022 125 430 1022 1986 3408 <br />15 - 513 1320 2673 4704 116 400 955 1858 3190 <br />16 - 479 1237 2511 4424 108 374 895 1745 2998 <br />17 - 449 1161 2366 4174 - 351 842 1644 2828 <br />18 - 423 ' 1093 2236 3950 - 330 794 1554 2675 <br />19 - 399 1033 2119 3749 - 312 751 1473 2538 <br />20 - 377 978 2012 3566 - 296 712 1399 2414 <br /> <br />1 Maximum capacity limited to bearing capacity of soil; i.e., if soil capacity is 4000 psf, <br />that becomes the limiting factor in determining configuration or end bearing area must <br />be increased. <br /> <br />2Length is determined as total height above and below grade with depth of embedment <br />greater than or equal to the height above grade but not less than six feet plus the <br />addition of scour depth as previously discussed. <br /> <br />3Rough dimensions. Nominal dimension will be 1/2 inch less per side on square posts. <br /> <br />4Rough dimension as diameter of round member. <br /> <br />56 <br />