Title:
LRFD Flexural Provisions for Prestressed Concrete
Bridge Girders Strengthened with Carbon Fiber-Reinforced Polymer Laminates
Author(s):
Sherif El-Tawil and Ayman M. Okeil
Publication:
Structural Journal
Volume:
99
Issue:
2
Appears on pages(s):
181-190
Keywords:
polymer; prestressed concrete; rehabilitation.
DOI:
10.14359/11543
Date:
3/1/2002
Abstract:
The behavior and design of prestressed concrete (PSC) bridge girders flexurally strengthened with carbon fiber-reinforced polymer (CFRP) laminates are discussed. A fiber section model that accounts for inelastic material behavior as well as the construction sequence including transfer, composite action between the cast-in-place deck and girder, and bonding of CFRP laminates, is developed. The model is verified and is then used to conduct thousands of Monte Carlo simulations of a number of bridges designed according to the 1998 AASHTO LRFD. The bridge designs address a broad range of design parameters including span length, ratio of dead load to live load, and amount of CFRP strengthening. The numerical simulations are used to develop cross-sectional resistance models from which the flexural reliability of the designed bridges is calculated using the first-order reliability method. An equation for the flexural strength reduction factor for PSC bridge girders strengthened with CFRP laminates is proposed.