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, <br /> FEDERALAVE 1/5/2010 SDAJob# 6262 IR <br /> Collar Tie Desis�n <br /> Rakerspacing = 24in <br /> Live load = 25 PSF <br /> Dead load = 15 PSF <br /> Roo{slope = 8in/12in <br /> B <br /> 12 8 <br /> �'°(F <br /> 8� 96 inches <br /> 735 Ib� <br /> A <br /> 12.1 ft <br /> Tension in collar tie: <br /> R� = 970 Ibs <br /> LMe = (970 x 12.1 fi) - (80 x 12 x 12.1 <br /> 2 ) - �B.O x1� = 0 <br /> T = 735 Ibs <br /> Collar ii=/roher grade HF#2 � <br /> Nai�s: --�1 <br /> Use 16d nails Z = 122 Ibs Cp = 1.15 <br /> Diameier = 0.162 " 1.5°/ 1.62" = 0.93 —► Nail penatration reduction <br /> --► 122 x 0.93 x 1.15 = 130 Ibs/nail <br /> —► Use (6) 76d nails Q each collar 1ie/raher Tension <br /> conn. w/ 2x8 collar ties of same grade Troru= 2 x 735 = 1470 Ibs <br /> TµioW= 10.88 x 525 x 1.15 = 6566 Ibs <br /> Size Rafters: � Collar tie tension OK <br /> 490 Ibs �Perp. Componenl of� <br /> 80 PLF �' Repetitive member (C, = 1.15) <br /> Cp = 1.3 L� = 1.Oh <br /> Bending: <br /> 0.125 N S,� Req'd = 1.30 in3—� 2x6 HF�2 <br /> : 12.1 N —� <br /> Shear: <br /> ,1Aax moinent = 1448 in-# Area Req'd = 7.33 in�—► 2xb HF#2 <br /> Max shear = 970 Ibs <br /> Deflection: (U240) <br /> —� Use 2x6 HF#2 raRers @ 24" o/c I, Req'd = 9.67 �n"—► 2x6 HF#2 <br /> t ►'U�) <br /> � j <br />