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ANDERSON & ASSOCIATES CONSULTING ENGINEERS, INC. <br />3902 VILLA SAN JOSIE DRIVE. JACKSONVILLE. FLORIDA 32217 (904) 731·7978 Fax (904) 731·7771 <br />12" x 12" TOWER SECTION <br />STRUCTURAL CAPACITY <br />A. Investigate Tower Aodal Capacity <br />1. Check Local Buckling of the Chord Member <br />Lc := 20 rl = 0.644 <br />Al = 1.068 Fal:=20.2- <br />Therefore: <br />0.126 ·f <br />r 1 <br />1-L= 31.045 <br />r 1 <br />51000Fa2:= -Fa := if -<66,Fal,Fa(Lc\2 rl. ?,c Fa = 16.288 <br />Ui7 Fa = 12 ksi (Weld Affected Zone) <br />Determine Allowable Force in Top Chord <br />Pc := if(Fa<12, Fa·Al, 12·Al)Pc·= 12.812 kips <br />2. Check Net Tension on the Chord Member <br />Al = 1.068 <br />Thereforce: <br />Ft:= 11 ksi (Weld Affected Zone) <br />Pl:= Ft·Al Pt = 11.744 kips <br />3. Check Weld at Chord to Vertical and Horizontal Members <br />e = 900 <br />I <br />SIDE END <br />d=1" <br />4 1 /-- F <br />0/2 =900 <br />Determine Length of Weld: <br />End Members are 2"xi"(1/8"Wall) <br />Lw:=2·2+2·1 Lw = 6 in. Where:tw:= 0.1875 in. 0/16" Weid) <br />Determine Allowable Force at Chord Member <br />Fw:= 5 ksi (Allowable Stress at Weld) <br />Pcw:= Fw·Lw·0.707·tw·2 Pcw = 7.954 kips COntIOIS