Cyclopedia of architecture, carpentry, and building : a general reference work . Fig. 97. Illustrating Problem onPage 73. multiplied by 2 in order thatthe same formula for the unit-stress may be used throughou tin the design of the column. Let four 5 by 3U)y f-inchangles with a 16 by f-inch webplate be assumed, and placedas shown in Fig. 97. Theseangles have an area of inches each; and amoment of inertia parallel tothe long leg, of 3 18. Then(see Strength of Materials,pp. 48-53), the moment dueto crane reaction is 20 000 X( + 8) = 322 500 pound-inches. Accordingly, in visingthi
Cyclopedia of architecture, carpentry, and building : a general reference work . Fig. 97. Illustrating Problem onPage 73. multiplied by 2 in order thatthe same formula for the unit-stress may be used throughou tin the design of the column. Let four 5 by 3U)y f-inchangles with a 16 by f-inch webplate be assumed, and placedas shown in Fig. 97. Theseangles have an area of inches each; and amoment of inertia parallel tothe long leg, of 3 18. Then(see Strength of Materials,pp. 48-53), the moment dueto crane reaction is 20 000 X( + 8) = 322 500 pound-inches. Accordingly, in visingthis in the formula, it will be2 X 322 500 = 645 000 pound-inches; and this, added to the924 000 pound-inches due tothe wind, will make a I Anchor BoltHoles kfi f«o°o°ol Fig. 98. Detail of Column. bending moment of 1,569,000 pound- 288 ROOF TRUSSES 75 /«_a = 4X + 4X + ^ j^ = , 12 ?«- ^ \ 4 == X + f X 16 The allowable unit-stress is: 20 X 12P = 24 000 - 110 X —/^(^ = 19 975 pounds per sriuaro inch.
Size: 945px × 2645px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, booksubjectarchitecture, booksubjectbuilding
