Title page for ETD etd-09062004-152133

Type of Document Master's Thesis
Author Kassner, Bernard Leonard
URN etd-09062004-152133
Title Long-term In-service Evaluation of Two Bridges Designed with Fiber-Reinforced Polymer Girders
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Cousins, Thomas E. Committee Chair
Lesko, John J. Committee Member
Roberts-Wollmann, Carin L. Committee Member
  • fiber-reinforced polymer (FRP)
  • pultruded composite girders
  • durability
  • wheel load distribution
  • dynamic load allowance
  • deflection
Date of Defense 2004-09-02
Availability unrestricted
A group of researchers, engineers, and government transportation officials have teamed up to design two bridges with simply-supported FRP composite structural beams. The Toms Creek Bridge, located in Blacksburg, Virginia, has been in service for six years. Meanwhile, the Route 601 Bridge, located in Sugar Grove, Virginia, has been in service for two years.

Researchers have conducted load tests at both bridges to determine if their performance has changed during their respective service lives. The key design parameters under consideration are: deflection, wheel load distribution, and dynamic load allowance.

The results from the latest tests in 2003 yield little, yet statistically significant, changes in these key factors for both bridges. Most differences appear to be largely temperature related, although the reason behind this effect is unclear. For the Toms Creek Bridge, the largest average values from the 2003 tests are 440 me for service strain, 0.43 in. (L/484) for service deflection, 0.08 (S/11.1) for wheel load distribution, and 0.64 for dynamic load allowance. The values for the Route 601 Bridge are 220 me, 0.38 in. (L/1230), 0.34 (S/10.2), and 0.14 for the same corresponding paramters.

The recommended design values for the dynamic load allowance in both bridges have been revised upwards to 1.35 and 0.50 for the Toms Creek Bridge and Route 601 Bridge, respectively, to account for variability in the data. With these increased factors, the largest strain in the toms Creek Bridge and Route 601 Bridge would be less than 13% and 12%, respectively, of ultimate strain. Therefore, the two bridges continue to provide a large factor of safety against failure.

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