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<br />DiPasquale Addition <br /> <br /> Height: 045 15-20 20-40 40-60 Total <br />Resisting Moment: 32.3 32.3 32.3 32.3 32.3 <br /> x 2/3 = 21.5 21.5 21.5 21.5 21.5 <br /> Uplift Moment -16.8 0.0 0.0 0.0 -16.8 <br />Hz. Pres. Moment -36.3 0.0 0.0 0.0 -36.3 <br />Overturning Mmt. = -53.1 0.0 0.0 0.0 -53.1 <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 2077 Ilbs <br />* * Specify tie-down accordingly, FS 'built in' to Mfr's tables. <br /> <br />X) Girder Uplift: <br />I.) Two (2) Point Bearing, Symmetric, <br /> <br />Girder Contrib. area (st) Height (ft) Net.Uplift (pst) Uplift per brg. <br /> 1 O. 0 -9.2 0.0 <br /> 1 O. 0 -9.2 0.0 <br /> I 0 0 -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 I Span 2 Height (ft) Net Uniform load Max. Uplift <br />Mark (ft) (ft) (Mn.. roof) Uplift (pst) on Truss (pIt) Reaction<(lbs) <br /> 1 0.0 -1 1.2 -22.4 0.0 <br /> I 0.0 -1 1.2 -22.4 0.0 <br /> <br />Page 7 <br /> <br />