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<br />.. <br /> <br />Model 2137 <br /> <br />Height: 0-15 15-20 20-40 40-60 Total <br />Resisting Moment: 976.5 976.5 976.5 976.5 976.5 <br />x 2/3 = 651.0 651.0 651.0 651.0 651.0 <br />Uplift Moment: -852.7 0.0 0.0 0.0 -852.7 <br />Hz. Pres. Moment: -205.5 -52.9 0.0 0.0 -258.5 <br />Overturning Mmt. = -1058.2 -52.9 0.0 0.0 -1111.1 <br /> / <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) / b = I 3544 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 />Girder Contrib. area (st) Height (ft) Net Uplift (pst) Uplift per brg. <br /> 12.3 -9.2 0.0 <br /> 12.3 -9.2 0.0 <br /> 12.3 -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 <br />Mark <br /> <br />Span 1 <br />(ft) <br /> <br />Span 2 <br />(ft) <br /> <br />Height (ft) Net <br />(Mn. root) Uplift (pst) <br />12.3 -11.2 <br />12.3 -11.2 <br /> <br />Uniform load <br />on Truss (pIt) <br />-22.4 <br />-22.4 <br /> <br />Max. Uplift <br />Reaction (Ibs) <br />0.0 <br />0.0 <br /> <br />Page 7 <br /> <br /> <br />~ <br />