The Elements of Graphic Statics and of General Graphic Methods (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...78. In Fig. too. assume the left end of the truss to be free, and draw the stress diagrams for the wind on the right. 79. Find, by the method of sections, the stresses in the members of the braced cantilever, Fig. 103. Scale, I inch = 10 feet; IV = 500 pounds. 80. In the braced cantilever, Fig. 105, assume an additional weight equal to Was suspended at the intersection of members 8 and 9. Modify the stress diagrams to suit these conditions. 81. Find the dead-load stresses in the cantilever roof truss, Fig. 104. Scale, 1 inch = 10 feet; trusses spaced 10 feet, c. to c.; weights as in Problem 2. 82. Determine the stresses in the members of the crane post, Fig. 106. Scale, 1 inch = 10 feet; W = 5 tons. 83. Find the stresses in this crane with this load, if all of the members between the diagonal GH and the apex A were replaced by a strut AG and a tie AH. CHAPTER IX BRIDGE TRUSSES The discussion which follows relates only to the fundamental principles governing the design of bridge trusses. The subject is complex, and, for full treatment of the many points involved, the student must consult special works covering it. 92. Bridge Trusses: Definitions. Bridge trusses are vertical framed structures which carry the dead and live loads in highway or railroad bridges. In general, they may be classed as simple beams resting upon two abutments, or as cantilevers, each anchored at the outer end and supporting, by links at the other, one extremity of a separate central truss, which joins the two cantilevers and forms with them the vertical framing of the completed bridge. Each truss is composed of an upper chord, a lower chord, and web members joining the two. The chords may be horizontal and parallel, or one chord may be a broken line or have its joints lying in the arc ...