Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 197
serve to show how slowly the lengthof counter-bracing decreases in heavy bridges,and how little stiffness can be gained by the expensive plan of bal-lasting. When the point s falls between the centre of a panel andthe end of a truss, no counter-brace is needed in that panel, but it iswell to put… … nc2r B D The Economical Gonstrxtction of Beam Trusses. 163 lutely useless, the strain on the main brace necessarily throwing thecounter out of adjustment. In determining the most economical arrange-ment of the bars composing the web, the re- Table I.lative inclination of struts and ties, and…
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