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<br />Bertuca Home <br /> <br />.'. Height: 0-15 .."" 15-20> 20-40 40-60 Total <br />Resisting Moment: 1094,3 1 094.3 1094,3 1094,3 1094,3 <br /> x 213 = 729.5 729.5 729.5 729.5 729.5 <br />Uplift Moment: -929.5 0,0 0.0 0.0 -929.5 <br />Hz. Pres. Moment: -180.7 -97.6 0.0 0.0 -278.4 <br />Overturning Mmt. = -1110.3 -97.6 0.0 0.0 -1207.9 <br /> <br />Note: If OM < 2/3 RM, hold-downs are not required. <br /> <br />Required tie-down force (T): <br /> <br />( Factor of Safety 'built in' to Mfr's tables.) <br /> <br />Therefore: T x b + RM > or = OM. <br />where, b= building width. <br /> <br />T = (OM-RM) 1 b = I 2582 Ilbs <br />** Specify tie-down accordingly, FS 'built in' to Mfr's tables. <br /> <br />x.) Girder Uplift: <br />1.) Two (2) Point Bearing, Symmetric, <br /> <br /> " <br />Girder Contrib.area (st) Height (ft) Net Uplift (pst) Uplift per brg. <br />Garage 432.0 13.2 -9.2 -1987.2 <br /> 13.2 -9.2 0.0 <br /> 13.2 -9.2 0.0 <br /> <br />2.) Three (3) point bearing. <br /> <br />Modeled as a simply supported beam each direction at intermediate support ( conservative) <br /> <br />Girder Span 1 Span 2 Height (ft) Net Uniform load Max. Uplift <br />Mark (ft) (ft) (Mn. root) Uplift (pst) on Truss (pIt) Reaction (Ibs) <br />FR Porch 29.5 9.5 13.2 -11.2 -22.4 -436.8 <br />BK Porch 34.0 5.0 13.2 -11.2 -22.4 -4 .8 <br /> <br />Page 7 <br /> <br />