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Ultra-high-performance concrete (UHPC) has been widely used in bridges and other structures throughout the world. However, very limited studies have been carried out to address the strength reduction factor for reinforced UHPC girders in flexure. This paper, therefore, attempts to develop reliability-based design provisions for the flexural strength of reinforced UHPC bridge girders with steel bars. First, an extensive design scope, which included various common design scenarios, was considered to conduct stochastic simulations. Subsequently, the resistance parameters were evaluated based on the available experimental data and Monte Carlo simulation (MCS). Then, the first-order second-moment method (FOSM) was applied to calibrate strength reduction factors to meet a uniform target reliability level, β_T = 3.5, specified in AASHTO LRFD Bridge Design Specifications. To verify the results obtained, a …