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<br /> <br />of 16 feet (eight feet above grade and eight <br />embed ment) could be used because its capacity <br />at 4906 pounds is greater than the vertical member <br />load of 4640 pounds. If a six foot spacing were <br />used in lieu of an eight foot spacing, the load per <br />post in this case is reduced to 3,480 pounds and <br />a 10 inch square post could be used with a subse- <br />quent reduction in bearing pad area. <br />By changing the vertical member spaci~g, <br />determining the applicable load and comparing <br />that load with different vertical member capacities, <br />as shown in this example, a number of elevated <br /> <br />Table 4.16 <br /> <br />design strategies can be determined for a par- <br />ticular site. <br />As previously discussed, state and local regula- <br />tions for manufactured home installations may <br />impose a height 'imitation on elevated foundations <br />unless they are designed by a registered profes- <br />sional engineer. Where elevations over state or <br />local height limitations are anticipated, the <br />materials in this chapter can be used as general <br />guidance but should not be used in lieu of ob- <br />taining an elevated foundation design by a <br />registered professional engineer. <br /> <br />1 <br />VERTICAL MEMBER CAPACITY (pounds per member) <br /> <br />Wind Design = 25 psf <br />Hane Width = 14 feet <br /> <br /> Vertical ~er Diarreter (in. ) <br /> Square3 Round4 <br />Leng t h2 <br />(ft. ) 4 6 8 10 12 4 6 8 10 12 <br />1 _ 1804 6170 13986 25698 41596 1641 5016 10863 19529 31259 <br />2 1022 3686 8730 16640 27791 916 2923 6567 12189 20066 <br />3 713 2628 6345 12303 20866 635 2062 4706 8859 14776 <br />4 547 2024 4983 9759 16703 486 1593 3666 6958 11693 <br />5 443 1670 4103 8087 13925 393 1298 3003 5729 9674 <br />6 371 1410 3487 6904 11940 330 1094 2543 4869 8250 <br />7 319 1221 3029 6023 10450 284 945 2205 4233 7191 <br />8 278 1075 2678 5341 9290 249 832 1945 3744 6373 <br />9 245 960 2399 4794 8362 220 743 1740 3357 5722 <br />10 219 866 2172 4350 7603 197 670 1574 3039 5192 <br />11 198 788 1984 3981 6963 178 610 1437 2778 4752 <br />12 180 721 - 1825 3668 6426 163 560 1321 2557 4377 <br />13 165 663 1689 3401 5966 150 516 1222 2369 4058 <br />14 152 613 1570 3169 5566 138 478 1137 2206 3783 <br />15 - 569 1466 2966 5216 128 444 1062 2064 35'42 <br />16 - 531 1373 '2787 4906 120 415 996 1939 3330 <br />17 - 498 1289 2627 4631 -' 390 936 1827 3141 <br />18 - 468 1213 2483 4383 - 367 883 1728 2973 <br />19 - 441 1145 2352 4160 - 346 834 1638 2821 <br />20 - 417 1084 2233 3958 - 328 791 1556 2683 <br /> <br />lMaxim.nn capacity limited to bearing capacity of soil; Le., if soil <br />capacity is 40'00 psf, that becanes the limiting factor in deteImining <br />configuration or end bearing area must be increased. <br /> <br />2Length is detennined as total height above and below grade with depth of <br />embedTent greater than or equal to the height above grade but not less than <br />six feet plus the addition of scour depth as previously discussed. <br /> <br />~ough dimensions. NOminal dimension will be 1/2 inch less per side on <br /> <br />square posts. <br /> <br />4Rough dimension as diarreter of round member. <br /> <br />57 <br />