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3902 VILLA-SAN-JOSE·DRIVE, JACKSONVILLE, FLORIDA'32217 (9043 931 -7978 Fax (904) 731-7771 <br />12" x 12" TOWER SECTION <br />STRUCTURAL CAPACITY <br />10'-0. <br />- <br />F 2"0 (316") Wall <br />--7 <br />_i <br />3 Sides <br />17.2"- 1 "0 (18") Wall <br /> 2"0 (18") Wall 10" <br />4lh Side <br />10 FT. TOWER SECTION <br />Section Properties: <br />1.2" Dia. (3/16" Wall) Tube 2.1" Dia. (1/8" Wall) Tube <br />Dl:= 2 tw := 0.1875 dl:= Dl - 2·tw D2:= 1 tw:= 0.125 d2:= D2 - 2·tw <br />Al:= 2.(1)12 -dit Al = 1.068 in2 A2:= 1.(D22 - (122)A.2 = 0.344 · in2A <br />Il := -1.(014 - d 14)It = 0.443 in4 12 := -1. (D24 - d24)I2 = 0.034 in464 64 <br />Il I2rl := 1-rl -0.644 in r2 := 1-4AI 4 +.2 2 = 0.313 in <br />3. Tower Properties dx := 10 in dy := 10 in Centerline Chord <br />A3:= 4·Al A3 = 4.271 in2 <br />\ 2 - Ux1x:= 4··Al·1-1 Ix = 106.765 in4 rx:= 1- ;rx = 5 in <br />4A3 <br />Iy:= 4 ·Al /dy <br />(2/ <br />2 <br />fiIy = 106.765 in4 Ey:= ,-ry = 5 in4 A3 <br />Iz:= 1x + ly Iz=213.53 in4 <br />ec:= 2 rad (Angle between ed:= 2 rad (Angle between2 Vertical & Horizontal) 4 Vertical & Diagonal) <br />4. Determine Weight of Tower Member <br />Chords:Wti := 00·12)·4·Al ·0.098 Wt <br />Horizontals: Wt2 := (0·667· 12)-13·A l ·0.098 Wt <br />Struts:Wt3 := (0.667·12)·15·A2·0.098 Wl <br />Diagonals:Wt4.= (0·943·12)·18·A2·0.098 Wt <br />,=50.222 <br />= 10.887 <br />2 <br />3 = 4.043 <br />Iwt4 = 6.859 Total = - <br />10 <br />·1.15=8.281 Say 8.5 lbslit <br />. <br />wd:= 8.5 pif