Weights of Metal in Steel Trusses
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VIEW THE REPLYPublication: Transactions of the American Society of Civil Engineers
Volume 101, Issue 1
Abstract
From the ten sets of curves in this paper a designer can read the ratio of the weight of metal in a truss (per linear foot) to the total vertical load (live, impact, and dead loads per linear foot) for which the truss is to be proportioned. They apply to simple truss, cantilever, and arch spans, for railways, highways, and combinations of both, designed either with carbon steel or with silicon steel.
Modifying formulas or data are given to cover uneconomic proportions, the use of high-alloy steels, and variations in the specified intensities of working tensile stress for carbon-steel structures. There are also four sets of curves showing total weights of metal per linear foot for various classes of bridges. These curves are inserted for the purpose of enabling the computer to determine his trial total load.
The paper concludes with a table indicating the results of the “spot-checking” of the percentage ratios, shown on the diagrams, by means of a score of spans for which the truss weights had previously been accurately determined. Only the last two of these cases were utilized in the preparation of the ratio curves; hence the others serve as an absolutely unbiased check on the accuracy of the diagrams.
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Published In
Transactions of the American Society of Civil Engineers
Volume 101 • Issue 1 • January 1936
Pages: 1 - 11
Copyright
© 1936 American Society of Civil Engineers.
History
Published in print: Jan 1936
Published online: Feb 10, 2021
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