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<br />Where floodwaters will directly affect the <br />manufactured home, the use of frame clips and <br />lag screws will not be capable of withstanding the <br />buoyancy forces created. In those cases, anchor- <br />ing of the manufactured home with ground <br />anchors must be considered or additional eleva- <br />tion considered to eliminate anticipated flood <br />forces on the manufactured home. <br /> <br />Cross Bracing <br /> <br />Connections between wood c-ross bracing and <br />vertical members as shown in Figure 4.51 must <br />be designed to withstand loads imposed on the <br />elevated foundation. <br />The following equation determines the minimum <br />number of bolts required at each cross bracing to <br />vertical member connection. <br /> <br />Number of Bolts <br />at Each Connection <br /> <br />Load <br />= <br />Bolt Capacity <br />from Table 4.26 <br /> <br /> <br />.. ... .... <br />',',',"..".',~.... <br /> <br />.......!!!I.!.~. <br />r.~,.. <br />'.................:i'Jt.......' <br />........ ... <br /> <br />@ @ <br /> <br />@ @) <br /> <br /> <br /> <br />Figure 4.51 Cross Bracing Vertical Member <br />Connection <br /> <br />Where: Load <br /> <br />= load on each member <br />(lb.) calculated as (L x <br />F d)/(2 x No, Bays) <br /> <br />L <br /> <br />= manufactured home <br />length (ft.) <br /> <br />Fd <br /> <br />= diagonal loading from <br />Table 4.27 (Ib.lft.) <br /> <br />No, Bays = Number of cross braced <br />bays across the width <br />of the manufactured <br />home <br /> <br />Table 4.26 provides the capacity in pounds for <br />various bolt diameters based on height of vertical <br />members above grade and vertical member <br />diameter. <br /> <br />Table 4.26 <br /> <br />BOLT CAPACITY (pounds) <br /> <br />HeJght Above Bolt Diameter Vertlcal MenDer Diarreter (in.) <br />Grade (ft.) (In.) 6 8 '" 12 <br />3 1/' 568 - - - - <br /> 5/8 861 881 888 - - <br /> 3/4 lIDO 1273 1217 1273 - <br />< 1/' 55< - - - - <br /> 5/8 '" 070 86. - - <br /> 3/4 1043 1234 1240 1232 - <br />5 11' 537 - - - - <br /> 5/' 783 845 835 - - <br /> 3/< 977 1185 1195 1184 - <br />6 11' 519 - - - - <br /> 5/8 739 817 803 - - <br /> 3/< 910 1134 1147 I131 - <br /> 7/' 1056 1455 1546 1529 1517 <br />7 5/8 "7 788 771 - - <br /> 3/< m 11183 1099 }1180 - <br /> 7/8 978 1367 1471 1457 1441 <br />8 3/< 790 1034 1054 1031 - <br /> 7/8 '83 1281 1413 1389 ]370 <br /> I 1016 1525 1711 1802 1769 <br />10 31< 688 951 ,,, 947 - <br /> 7/8 791 1153 1300 1272 ]249 <br /> 1 884 1340 1617 1647. 1609 <br /> <br />The anticipated diagonal loading due to lateral <br />wind load per foot length of manufactured home <br />is shown in Table 4.27 and is based on height <br />above grade and wind load. <br />For example. consider a 60 foot manufactured <br />home located in a 25 psf wind load zone with 8 <br />inch vertical members six feet above grade and <br />four braced vertical member bays. The load per <br />diagonal member is calculated as follows: <br /> <br />Load = 60 ft. x 265 Ib.lft. <br /> <br />4 x 2 <br /> <br />= <br /> <br />1,987.5 lb. <br /> <br />66 <br />