Canadian engineer . inverted dome. The anglebeing 45 deg. the thrust on the dome is 8ico V 2 = 11,450lb. per lineal foot. The shearing stress per square inch is8100 -f 12 X 8 V 2 = 60 lb. The compressive stress persquare inch is 11,450 -^- 12 x 8 = 120 lb. The sphere has a radius of 16 ft., and the section ofthe sphere forming the dome a diameter of 19 ft. and a riseof 2 ft. 9 in. The weight of the dome is approximately i9r/4 x i-iX 100 = 31,000 lb. The weight of the water above it isi9^7r/4 X 20 X = 355,000 lb. and the vertical shear orreaction at the base per lineal foot is 386,000 -^ 1
Canadian engineer . inverted dome. The anglebeing 45 deg. the thrust on the dome is 8ico V 2 = 11,450lb. per lineal foot. The shearing stress per square inch is8100 -f 12 X 8 V 2 = 60 lb. The compressive stress persquare inch is 11,450 -^- 12 x 8 = 120 lb. The sphere has a radius of 16 ft., and the section ofthe sphere forming the dome a diameter of 19 ft. and a riseof 2 ft. 9 in. The weight of the dome is approximately i9r/4 x i-iX 100 = 31,000 lb. The weight of the water above it isi9^7r/4 X 20 X = 355,000 lb. and the vertical shear orreaction at the base per lineal foot is 386,000 -^ 19 t = 6400lb. This force may be resolved into two components, asshown in Fig. i, a thrust on the ring girder nearly counter-balancing the thrust from the inverted dome, and a thrustof 10,800 lb. per lineal foot on the dome. 3 sets of Horizontal Bracing3 sets of Diagonal Bracing, 2x6 ?>xlORadial Supports50long, 20c. toc. set on these ^ One t2xl2 Timbertop of Staging^ Load of Concrete Shell3000*per sq. foot ~>. Shell Fig. 2.—Plan of the Top Staging. The shearing stress per square inch is 6400 -i- 12 x 9-7= 55 lb. The compressive stress per square inch is 10,800-^ 12 X 8 = 113 lb., showing also an unusually high factorof safety. In calculating the ring girder supporting the tankstructure it was assumed that the portion of the load overthe columns was carried directly. The girder was thenfigured as a continuous beam with suppons assumed I3j4 8;6 THE CANADIAN ENGINEER ft. apart. Bending moments of the straight line span werecompounded with the torsional moment. While stresses in the circular girder as soon as con-struction was completed are held to be vertical only, theweight of the green concrete in the inclined columns pro-duced four inward thrusts on the ring. To care for thesestresses concrete struts in the form of a cross connected thetops of the columns. Assuming a force of 50 lb. per square foot on a flat sur-face, the total force of the wind on the round tank is 31 x
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
