Cyclopedia of architecture, carpentry, and building : a general reference work . 5^ 5 :i: UQ D O - O - O ~ ^ >. o .- O -3 W s CS - E-t =^ ^ Z < S b : W S o ;. STRENGTH OF MATERIALS 65 EXAMPLES FOR PRACTICE. 1. A beam 12 feet long and 6 X 12 inches in cross-sectionrests on end supports, and sustains a load of 3,000 pounds in themiddle. Compute the greatest tensile and compressive unit-stresses in the beam, neglectino; the weight of the beam. Ans. 750 pounds per square inch. 2. Solve the preceding example taking into account theweight of the beam, 800 pounds Ans. pounds per square in
Cyclopedia of architecture, carpentry, and building : a general reference work . 5^ 5 :i: UQ D O - O - O ~ ^ >. o .- O -3 W s CS - E-t =^ ^ Z < S b : W S o ;. STRENGTH OF MATERIALS 65 EXAMPLES FOR PRACTICE. 1. A beam 12 feet long and 6 X 12 inches in cross-sectionrests on end supports, and sustains a load of 3,000 pounds in themiddle. Compute the greatest tensile and compressive unit-stresses in the beam, neglectino; the weight of the beam. Ans. 750 pounds per square inch. 2. Solve the preceding example taking into account theweight of the beam, 800 pounds Ans. pounds per square inch. 3. Suppose that a built-in cantilever projects 5 feet from thewall and an end load of 250 pounds. The cross-section ofthe cantilever being represented in Fig. 38, compute the greatesttensile and compressive unit-stresses, and tell at what places theyoccur. (Neglect the weight.) j Tensile, 4,171 pounds per square inch. I Compressive, 11,150 4. Compute the greatest tensile and compressive unit-stressesin the beam of Fig. IS, (f, due to the loads and the weight of beam(400 pounds). (A moment diagram is represented in Fig. 18, J;for description see
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