Laserfiche WebLink
' . � i <br /> ?.. BENDING STRESS IN SMALLEST BEAM OR PURLIIJ <br /> Bending stress = Wind Force � 100 MPH x Mast Heiaht <br /> Size of Smalltest Beam <br /> = 1939 x 36" <br /> 21 . 3 (Canopy Design #3) <br /> = 2429 psi 29 ksi all.owed <br /> B. SHEAR STRESS AT BEAM TOP FLANG� <br /> Shear Stress = Wind Force i 100 MPH x Mast Heiaht <br /> Min. Beam Depth x Beam Planqe <br /> Thickness x Mast Flange Width I <br /> = 1434 x 36" <br /> 10 .1 x .39 x 6 .75 <br /> = 1942 psi 14 .4 ksi allowed <br /> At 125 MPH Wind - F = 2240N max (1.8M) <br /> A <br /> Mt = 1250 FT-L8 . <br /> . 2 <br /> At 100 MPH Survival F Max = 100 x �240 = 1434$ <br /> A 2 <br /> 125 <br /> 2 <br /> MTM = 1C0 x 1250 = 800 FT-LB <br /> —2 <br /> 125 <br /> Check Stress at Pipe Base <br /> Hending Stre;s = M = 1434 x 3 x 12 = 16, 491 psi �(<24 ksi OK <br /> S 3.14 <br /> C. EVALUATION OF THE POINI'ING ER.ROR OF THE ANTENNA MOUNTING <br /> PIPE: <br /> 2 • <br /> Pointinq Error = W1 x 180 . <br /> 2EI 7r <br /> 6 <br />