Title: Non-Linear Evaluation of Strengthening Techniques for the Champlain Bridge
Author(s): Denis Mitchell, Bruno Massicotte, William D. Cook, and Emre Yildiz
Publication: Symposium Paper
Appears on pages(s): 143-161
Keywords: bridges, post-tensioned concrete, deterioration, flexure, shear, finite element analysis, CFRP, girders, rehabilitation
The existing Champlain Bridge is a major structure in Montreal. It contains 50 concrete spans. The 10 ft
(3.1 m) deep I-girders span 172 ft (52.4 m) and are post-tensioned. Because the prestressing steel has suffered from
corrosion, it was necessary to use advanced techniques to evaluate the performance of these I-girders. Detailed twodimensional
non-linear finite element modelling was used to determine the responses at service load and at ultimate.
Three-dimensional finite element modelling was carried out to determine the loading for the two-dimensional
modelling. The serviceability checks examined if cracking would occur and the strength requirements were evaluated
using predicted demand-to-capacity ratios (D/C). These analysis tools also enabled the influence of a number of
strengthening techniques to be assessed. The influence of different strengthening techniques on the predicted
responses of the diaphragms was also studied. The combinations of strengthening measures were found to be effective in achieving the desired serviceability and strength requirements.