Strengthening of Existing Continuous Composite Bridges, HR-287, 1987

(1987) Strengthening of Existing Continuous Composite Bridges, HR-287, 1987. Transportation, Department of

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Abstract

Research was conducted to investigate the potential of strengthening continuous bridges by post-tensioning. The study included the following: a literature review, selection and rating of a prototype continuous composite bridge, tests of a one-third-scale continuous composite bridge model, finite element analysis of the bridge model, and tests of a full-scale composite beam mockup for a negative moment region. The study results indicated that the strengthening of continuous, composite bridges is feasible. The primary objective in applyig the post-tensioning should be to provide moments opposite to those produced by live and dead loads. Longitudinal distribution of that post-tensioning always must be considered if only exterior or only interior beams are post-tensioned. Testing and finite element analysis showed that post-tensioning of positive moment regions with straight tendons was more effective than post-tensioning negative moment regions with straight tendons. Changes in tension in tendons may be either beneficial or detrimental when live loads are applied to a strengthened bridge and thus must be carefully considered in design.

Item Type: Departmental Report
Keywords: Bridge design, Bridges, Composite construction, Continuous structures, Finite element method, Live loads, Mathematical models, Posttensioning, Strength of materials, Strengthening (Maintenance), Structural design, Tendons, Testing, Models
Subjects: Transportation
Transportation > Bridges and tunnels
Transportation > Roads and highways
Transportation > Design and Construction
ID Code: 16209
Deposited By: Iowa DOT Library
Deposited On: 05 Mar 2014 13:46
Last Modified: 03 Oct 2014 12:27
URI: http://publications.iowa.gov/id/eprint/16209