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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Strengthening of Existing Bridges (simple and continuous span)
Author(s): F. Wayne Klaiber, Kenneth F. Dunker and W. W. Sanders, Jr.
Publication: Special Publication
Appears on pages(s): 207-228
Keywords: bridges (structures); flexural strength; loads (forces); post-tensioning; renovating; research; spans; strengthening; stresses; structural design; tests; unbonded prestressing; Design
Abstract:Approximately 40 percent of the bridges in the United States are classified as deficient and in need of rehabilitation or replacement. Of these bridges, many are classified as deficient because their load-carrying capacity is inadequate for today's increased traffic. This insufficient load-carrying capacity has resulted from poor maintenance, increase in legal load limits, deck overlays, changes in design specifications, and other factors. In response to the need for a simple, efficient procedure for strengthening existing bridges, the authors have been investigating the use of post-tensioning. They have investigated its use on simple span bridges as well as continuous span bridges. Various post-tensioning schemes have been tested on laboratory models and actual bridges. The paper briefly reviews the post-tensioning research that has been completed by the authors in the past few years. This work indicates that post-tensioning is a viable, economical technique for flexural strengthening of steel-beam composite-concrete deck bridges.
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