Design Manual for Strengthening Single-Span Composite Bridges by Post-Tensioning Part 3, HR-238, 1985

(1985) Design Manual for Strengthening Single-Span Composite Bridges by Post-Tensioning Part 3, HR-238, 1985. Transportation, Department of

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Abstract

The authors have post-tensioned and monitored two Iowa bridges and have field tested the post-tensioning of a composite bridge in Florida. In order to provide the practical post-tensioning distribution factors given in this manual, the authors developed a finite element model of a composite bridge and checked the model against a one-half scale laboratory bridge and two actual composite bridges, one of which had a 45 deg skew. Following a brief discussion of this background research, this manual explains the use of elastic, composite beam and bridge section properties, the distribution fractions for symmetrically post-tensioned exterior beams, and a method for computing the strength of a post-tensioned beam. Also included is a design example for a typical, 51.25-ft (15.62-m) span, four-beam composite bridge. Moments for Iowa Department of Transportation rating trucks, H 20 and HS 20 trucks, have been tabulated for design convenience and are included in the appendix.

Item Type: Departmental Report
Keywords: Bridges, Composite structures, Design methods, Finite element method; Manuals, Mathematical models, Monitoring, Posttensioning, Skew bridges, Strength of materials, Strengthening (Maintenance), Composite bridges
Subjects: Transportation
Transportation > Bridges and tunnels
Transportation > Roads and highways
Transportation > Design and Construction
ID Code: 16226
Deposited By: Iowa DOT Library
Deposited On: 05 Mar 2014 13:48
Last Modified: 03 Oct 2014 12:28
URI: http://publications.iowa.gov/id/eprint/16226