Framework for Time-Dependent Reliability of GFRP-RC Slab-on-Girder Bridge Decks under Freeze–Thaw and Creep Rupture Effects: Application for Sustainable Designs in Nova Scotia, Canada

This paper presents a framework to conduct time-dependent reliability analysis of tension- and compression-controlled flexural design of glass fiber–reinforced polymer (GFRP)-reinforced concrete (RC) slab-on-girder bridge decks. The framework accounts for the cumulative damage in the resistance model through concrete compressive strength degradation due to the freeze–thaw effect and GFRP tensile strength degradation due to creep rupture. It also incorporates site-specific damage parameters and weigh-in-motion (WIM) data. The framework was applied to assess the reliability of in-service bridge decks in Nova Scotia, Canada, and propose alternative designs to reduce the greenhouse gas (GHG) emissions using site-specific WIM data and test results of aged GFRP concrete bending members. Analysis results showed that bridge decks designed using a concrete compressive strength of 35 MPa can yield a design lifetime reliability index greater than 3.5 and a 20% reduction in the GHG emissions compared with bridge decks designed using a concrete compressive strength of 45 MPa. The research findings were utilized by the Nova Scotia Department of Public Works for the design of new bridge decks in the province.