Probabilistic Analysis of Post-Tensioned Steel Girder Bridgesby Sami W. Tabsh, Gannett Fleming, Inc, Harrisburg, United States,
Jack R. Kayser, Gannett Fleming, Inc, Harrisburg, United States,
Abstract: External post-tensioning is used as a means of strengthening existing steel girder bridges. Since absolute safety of structures is impossible to attain due to uncertainty in load and resistance, a reliability-based approach is carried out on typical post-tensioned girders (elements) and superstructures (systems) in flexure. The study showed that post-tensioning can result in a considerable increase in the bridge reliability. The increase greatly depends on the area, stress and position of the post-tensioned bars.
Subject Headings: Steel bridges | Girder bridges | Tension | Structural reliability | Steel structures | Structural safety | Probability | Structural strength
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