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ROOF DIAPHRAGM <br />Max Tension/Compression Force:LONGITUDINAL DIRECTION:TRANSVERSE DIRECTION: <br />T =C =*Ω w:w: <br />L:L: <br />w:Seismic force/ft.b:b: <br />L:Length of Diaphragm Ω:Ω: <br />b:Depth of Diaphragm <br />Ω:Overstrength Factor T=C=T=C= <br />DESIGN FOR TENSION: <br />Allowable Tension Force: <br />USING (2) 2x4 DBL TOP PLATE CHORDS:Tallowable =>T = <br />Tallowable =w*d*ft*cd <br />d =Depth <br />w =Width <br />ft =Allowable Tension Stress <br />Cd =Load Duration Factor <br />Tallowable = <br />CHORD SPLICE: <br />T =Max Tension Force <br />n=16D requried =T/(Z'ASD) <br />Z'ASD = <br />n = <br />ST6236 16d NAILS <br />MST48 Strap <br />MST60 <br />(2) ST6236 <br />(2) MST48 <br />(2) MST60 <br />Note: Values from LARR#25713 <br />3.0 in <br />3.5 in <br />CHORD DESIGN <br />GOVERNS <br />therefore <br />CHORD DESIGN <br />575 psi <br />1.6 <br />9660 lbs <br />OR <br />3845 lbs <br />STRAP SCHEDULE <br />9660 lbs 2045 lbs <br />7690 lbs <br />9860 lbs <br />13460 lbs <br />USE: <br />6730 lbs <br />4930 lbs <br />8b <br />76 plf <br />226 lbs <br />10 <br />w*L2 <br />41 ft <br />2045 lbs <br />20 ft <br />183 plf <br />20 ft <br />41 ft <br />USE (2) 2x4 TOP PLATES <br />2.5 <br />2045 lbs <br />2.5 <br />529 lbs <br />7.0 <br />CHORD SPLICE DESIGN <br />16 <br />ST6236 <br />Page 30