Strengthening of Single-Span Steel-Beam Bridges

by Wayne F. Klaiber, (M.ASCE), Prof. of Civ. Engrg.; Iowa State Univ., Ames, Iowa,
Kenneth F. Dunker, (M.ASCE), Asst. Prof. of Civ. Engrg.; Iowa State Univ., Ames, Iowa,
Wallace W. Sanders, Jr., (F.ASCE), Prof. of Civ. Engrg. and Asst. Dir. of the Engrg. Research Inst.; Iowa State Univ., Ames, Iowa,

Serial Information: Journal of the Structural Division, 1982, Vol. 108, Issue 12, Pg. 2766-2780

Document Type: Journal Paper


The use of post-tensioning to increase the strength of steel beams in beam and concrete-slab bridges is shown to be feasible. The purpose of the study is to determine a technique for increasing the capacity of the bridges to meet today's loadings. The results of testing a half-scale model of an existing bridge indicate that post-tensioning can be used with only minor deck cracking. Comparisons of the data from the model with results using orthotropic plate theory indicate that this theory can be used as a preliminary design methodology for determining the required prestress force and its location for strengthening existing bridges.

Subject Headings: Steel beams | Structural strength | Strength of materials | Steel bridges | Span bridges | Bridge design | Tension | Load bearing capacity

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