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HORIZONTAL WOOD DIAPHRAGM CHORD DESIGN <br /> Designer Name: CRH <br /> Job Number: 17134 <br /> Job Name: - Level: ROOF TYP <br /> Diaph.Label: - <br /> A.Diaphragm Dimensions DESIGN DATA: <br /> 14— B —H Dimensions <br /> I T 1.Width(ft) A= 20 <br /> 2.Length(ft) B= 34 <br /> 20 ft <br /> Loads; <br /> I I 1.Wind(lbs) Pi= 2160 <br /> P2= 1706 <br /> 2.Seismic(lbs) Pi= 1565 <br /> hi_'— 34 ft P2= 1280 <br /> Pi 1 t P2 <br /> Chord Properties; <br /> 1.Top plate lumber used TWO 2X4 <br /> C.Moment Diagram 2.Holes in chord area(sq.in) 1 <br /> NDS Table 4A 3.Design tension parallel to grain(psi) Ft 525 <br /> MMAX 4.Design chord tensile area(sq.in) 4.25 <br /> Chord Splice Properties <br /> 1.Nail Size 16d <br /> 14— X —P1 <br /> C.Checks/Calcs. <br /> 1.Location of max moment and moment magnitude= <br /> Wind A.Location of M.= Pi X B 2160 X 34- 19 ft =X <br /> (From Left orPi) (P1+P2) (2160+1706) <br /> • <br /> Seismic Location of Mm = Pi X B 1565 X 34- - 18.7 ft =X <br /> (From Left orPi) (P1+P2) (1565+1280) <br /> Wind B.Magnitude M,,,ax= Pi(X) = 2160 X 19 = 20520 ft lbs <br /> 2 2 <br /> Seismic Magnitude Morax= Pi(X) = 1565 X 18.7 = 14632.8 ft lbs <br /> 2 2 <br /> 2.Chord Tensile Strength Check <br /> Allowable Tension <br /> M _ Wind= 1026 3570 > 10261 29% <br /> T(lbs)=C= A Seismic= 732 1.6 X 525 X4.25 = 3570 > 732 21% <br /> 3.Chord(Nailed Splice) <br /> Design Number of Nails <br /> Wind T=1026 lbs Governs 16d Sinker= HF=102 X 1.6 = 163.2 1026/163.2= 6 in HF <br /> Seismic T=732 lbs DF=122 X 1.6 = 195.2 1026/195.2= 5 in DF <br />