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<br />McAdams Addition <br /> <br />. Height: 0-15 15-20 20-40 40-60 Total <br />Resisting Moment: 242.7 242.7 242.7 242.7 242.7 <br /> x 2/3 = 161.8 161.8 161.8 161.8 161.8 <br />Uplift Moment : -62.8 0.0 0.0 0.0 -62.8 <br />Hz. Pres. Moment: -61.7 0.0 0.0 0.0 -61.7 <br />Overturning Mmt. = -124.6 0.0 0.0 0.0 -124.6 <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 -7381 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. NIA <br /> <br />Girder Contrib. area (sf) Height (ft) Net Uplift (psf) Uplift per brg. <br /> 11.0 -9.2 0.0 <br /> 11.0 -9.2 0.0 <br /> 11.0 -9.2 0.0 <br /> <br />Girder <br />Mark <br /> <br />2.) Other configurations ie. three (3) point brg. <br />Contrib. Height (ft) <br />area (sf) (Mn. roof) <br />11.0 <br />11.0 <br /> <br />Net Uplift (psf) <br />-9.2 <br />-9.2 <br /> <br />NIA <br /># Brg. <br />Points <br /> <br />Max. Uplift <br />Reaction (lbs) <br /> <br />Page 7 <br /> <br />