Degree Type

Thesis

Date of Award

2008

Degree Name

Master of Science

Department

Civil, Construction, and Environmental Engineering

First Advisor

Terry J. Wipf

Second Advisor

F. Wayne Klaiber

Third Advisor

David J. White

Abstract

There are hundreds of structurally deficient or functionally obsolete bridges in the state of Iowa. With the majority of these bridges located on rural county roads where there is limited funding available to replace the bridges, diagnostic load testing can be utilized to determine the actual load carrying capacity of the bridge. One particular family or fleet of bridges that has been determined to be desirable for load testing consists of single-span bridges with non-composite, cast-in-place concrete decks, steel stringers, and timber substructures.;Six bridges with poor performing superstructure and substructure from the aforementioned family of bridges were selected to be load tested. The six bridges were located on rural roads in five different counties in Iowa: Boone, Carroll, Humboldt, Mahaska, and Marshall. The results of diagnostic load tests on the superstructure of the six bridges were used to calibrate analytical models of the bridges for rating purposes. All of the bridges were independently rated by three rating agencies using a codified approach. Those ratings were then compared to ratings calculated using a bridge model calibrated to the actual response of the bridge due to the load test. The calibrated bridge model was then used to rate the bridges and determine whether an increase in the initial codified bridge ratings was feasible.;This thesis focuses on evaluating the superstructure for this family of bridges and discusses the behavior characteristics that influence the load carrying capacity of this fleet of bridges. In particular, the live load distribution, partial composite action, and bearing restraint were investigated as potential factors that could influence the bridge ratings. Implementing fleet management practices, the bridges were analyzed to determine if the load test results could be predicted to better analyze previously untested bridges. For this family of bridges it was found that the ratings increased as a result of the load testing demonstrating a greater capacity than determined analytically.

DOI

https://doi.org/10.31274/rtd-180813-16540

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Jeremy Craig Koskie

Language

en

Proquest ID

AAI1453124

OCLC Number

235521040

ISBN

9780549541943

File Format

application/pdf

File Size

229 pages

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