Cyclopedia of architecture, carpentry, and building : a general reference work . the dangerous section by 15 pounds persquare inch. 3. A T-bar (see Fig. 38) 8 feet long and supported at eachI \W~ 6iiclj bears a uniform load of 1,200 _dis^ pounds. The moment of inertia of itscross-section with respect to the neu-cO tral axis being inches*, computew the maximum tensile and compressive—i- unit-stresses in the beam N-. ? * Evidently the dangerous section is in the middle, and the value of the maximum bendino- moment(see Table B, page 55, Part I) is ^ W/, W and I denoting the loadand length re
Cyclopedia of architecture, carpentry, and building : a general reference work . the dangerous section by 15 pounds persquare inch. 3. A T-bar (see Fig. 38) 8 feet long and supported at eachI \W~ 6iiclj bears a uniform load of 1,200 _dis^ pounds. The moment of inertia of itscross-section with respect to the neu-cO tral axis being inches*, computew the maximum tensile and compressive—i- unit-stresses in the beam N-. ? * Evidently the dangerous section is in the middle, and the value of the maximum bendino- moment(see Table B, page 55, Part I) is ^ W/, W and I denoting the loadand length respectively. Here — ?Wl=—.X 1,200 X 8 = 1,200 foot-pounds, or 1,200 X 12 = 14,400 inch-pounds. The section modulus equals -^ = ; hence ^, 14,400 _ S = .. ? = 13,585 pounds per square inch. This is the unit-fibre stress on the lowest fibre at the middle sec-tion, and hence is tensile. On the highest fibre at the middlesection the unit-stress is compressive, and equals (see page 02): c S = — S == g-^ X 13,585 = 4,290 pounds per square inch. 74. ^«^-J
Size: 1362px × 1835px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, booksubjectarchitecture, booksubjectbuilding
