"The three-span continuous bridge is one of the most popular bridges used by highway departments at the present time. The low first cost and overall economy combined with the pleasing appearance of this type of bridge as compared to simple span structures has led most highway departments to use continuous spans whenever conditions permit. The design of three-span continuous bridges, as well as the design of any of the other bridge types, is usually carried out as an analysis rather than a design. In the case of the three-span continuous girder, with rolled steel beams, an initial assumption as to the most economical span length ratio is made. If the analysis of the assumption shows that the arrangement is uneconomical, another assumption is made and so on until an economical arrangement is found. The more experience the designer has, the better are his assumptions. In other words, unexperienced designers may have to analyze many situations before they obtain an economical design. Although there has been much progress in the simplification of the analysis of stresses in indeterminate structures, there has been very little in their actual design. The purpose of this paper is to present a method for determining the most economical span length ratios in a continuous girder directly and thus eliminate the need for the designer to obtain the same results by successive assumptions"--Introduction, page 1-2.
Carlton, E. W.
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
Missouri School of Mines and Metallurgy
v, 42 pages
© 1950 Donald H. Timmer, All rights reserved.
Thesis - Open Access
Continuous bridges -- Design and construction -- Costs
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Electronic OCLC #
Link to Catalog Record
Timmer, Donald Hindrik, "Economical span length ratios for three-span continuous girder bridges" (1950). Masters Theses. 6759.