Streamlined Framework to Select Corrosion-Resistant Reinforcement to Balance Life-Cycle Costs and Ductility of Concrete Bridge Decks

Abstract

This paper presents a streamlined and simplified framework to select the optimal corrosion-resistant reinforcement type and subsequently calculate the corresponding life-cycle costs for concrete bridge decks. Additionally, a design-oriented methodology that accounts for the effect of high-strength reinforcement, most notably reduced ductility and its implications on structural safety decision-making, is also included as part of the framework. The researchers developed a design-friendly high-strength reinforcement factor that is predicated on the net tensile strain of the high-strength reinforcement relative to the corresponding value of an equivalently designed bridge deck using conventional reinforcement. The framework provides two approaches for estimating life-cycle costs; the first adopts a theoretical present-value calculation from previous researchers, and the second serves as a simplified approach that directly superimposes material and repair costs over the intended service life. Example life-cycle cost estimates are then shown for a series of corrosion-resistant bar types including epoxy-coated; galvanized; stainless steel; and high-strength low-carbon, chromium (A1035) bars. A case study focusing on the ductility of high-strength reinforcement then provides further recommendations for implementing such bars into the larger framework. Lastly, two example bridge deck scenarios are highlighted to demonstrate the implementation of the proposed framework. The framework is designed to facilitate straightforward optimal design solutions for department of transportation (DOT) officials, consulting engineers, and others, for bridge deck applications where enhanced corrosion resistance is necessitated and access to more theoretical life-cycle cost methodologies is limited.