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<br />Christopher Residence <br /> <br />Height: 0-15 15-20 20-40 40-60 Total <br />Resisting Moment: 3704.7 3704.7 3704.7 3704.7 3704.7 <br />x 2/3 = 2469.8 2469.8 2469.8 2469.8 2469.8 <br />Uplift Moment: -1489.3 0.0 0.0 0.0 -1489.3 <br />Hz. Pres. Moment : -189.0 -91.1 0.0 0.0 -280.1 <br />Overturning Mmt. = -1678.2 -91.1 0.0 0.0 -1769.3 <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 />T = (OM-RM) I b = I 0 Ilbs <br /> <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 />Girder Contrib. area (st) Height (ft) Net Uplift (pst) Uplift per brg. <br />Rear Grdr 360.0 13.0 -9.2 -1656.0 <br /> 13.0 -9.2 0.0 <br /> 13.0 -9.2 0.0 <br /> <br />2.) Other configurations ie. three (3) point brg. <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. roof) Uplift. (pst) on Truss (pIt) Reaction (Ibs) <br />Lanai 30.0 11.0 13.0 -9.2 -18.4 -377.2 <br /> 13.0 -9.2 -18.4 0.0 <br /> <br />Page 7 <br /> <br />