. Design of elevated steel tanks. * - DESIGN, A. - Four-post Hemispherical Bottom Tank (Posts Battered.) Capacity 100,000 gallons. Height 111 feet to Stresses. (a) Center of Gravity on Tank. ,22 To determine the center of gravity on tank,take moments about the balcony line. Roof = = 3910 Shell = 7620 x222 11530 880 rwTotal area = Moment=10650# (b) Wind Loads. Distance of center of gravityabove balcony line a 10650 = feet. Total wind pressure on tank at•30# per square foot over 60$dia
. Design of elevated steel tanks. * - DESIGN, A. - Four-post Hemispherical Bottom Tank (Posts Battered.) Capacity 100,000 gallons. Height 111 feet to Stresses. (a) Center of Gravity on Tank. ,22 To determine the center of gravity on tank,take moments about the balcony line. Roof = = 3910 Shell = 7620 x222 11530 880 rwTotal area = Moment=10650# (b) Wind Loads. Distance of center of gravityabove balcony line a 10650 = feet. Total wind pressure on tank at•30# per square foot over 60$diametrical plane = x 30 xO. 60 = 16200£ Assume wind load on tower at 200 pounds per vertical load at balcony line = 200 x 18 = 3600# 200 x # 200 x # Wind load at first strutline Wind load at second strutline (c) Moments. Determine moment of the wind forces at the balcony line,first strut, second strut and base of tower respectively. Moment at the balcony line Mo = 16200 x = 192,000 foot pounds ho. Homent at 1st panel M, = 16200 x = p. ?* 5600 X ? Homent at 2nd panel tt — ~\ connm i — J-t><suu X O ft . O o 3600 X 7300 X Moment
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