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BAMBURG 12/14/2021 SDA Job# 6548 1 <br /> Collar Tie Design <br /> Rafter spacing = 24 in <br /> Live load = 25 PSF <br /> Dead load = 15 PSF <br /> Roof slope= 2in/12in <br /> B� <br /> 12 <br /> 8 <br /> 0 p�F <br /> 2 13 inches <br /> 236- 3 Ib <br /> A <br /> 8.0 ft / <br /> Tension in collar tie: <br /> RA= 640 Ibs <br /> ZMa= (640 x 8.0 ft) - (80 x 8 x 8.0 <br /> T= 2363 Ibs <br /> Collar tie/rafter grade i HF# <br /> Nails: <br /> Use 16d nails Z= 122 lbs Co <br /> Diameter= 0.162 " 1.5 / 1.62"= 0.93 ---► Nail penatration reduction <br /> ---► 122 x 0.93 x 1.15= 130 Ibs/nail <br /> --► Use(18) 16d nails @ each collar tie/rafter Tension <br /> conn.w/ 2x6 collar ties of same grade TTOTAL= 2 x 2363 =4726 Ibs <br /> TALLOW= 8.25 x 525 x 1.15 =4981 Ibs <br /> Size Rafters: Collar tie tension OK <br /> 394 Ibs (Perp. Component of T) <br /> 80 PLF [] Repetitive member(Cr= 1.15) <br /> CF = 1.2 LU = 1.0 ft <br /> Bending: <br /> 1.5 ft S,,Req'd = 9.36 in"- <br /> -,, 2X6 HF#2 <br /> 8.0 ft <br /> Shear: <br /> Max moment= 10440 in-# Area Req'd = 4.84 in`--, 2x6 HF#2 <br /> Max shear= 640 Ibs <br /> Deflection: (U240) <br /> a Use W HF#2 rafters @ 24" o/c 1,Req'd = 9.29 in4--► 2x6 HF#2 <br /> - ......... <br />