Abstract: Time-dependent reliability model for the ultimate load-carrying capacity of steel fiber reinforced concrete (SFRC) beams subjected to long-term load is established based on the results obtained from the beams under sustained load ten years.Two series of tested beams are considered: Series I with constantly applied load but varying steel fiber content， and Series II with the same steel fiber content but subjected to different applied loads. The time-dependent reliability indexes are determined and the reliability pattern for 100 years of long-term load is forecasted using the equivalent resistance method and the first-order-second-moment method. The results show that the optimum content of steel fibers is 0.5% in Series I beams; however， for Series II beams with the same steel fiber content， the smaller the applied load is， the larger the reliability index and the flexural capacity are. Also， the reliability indexes are almost the same for similar applied loads. Under service conditions， the reliability indexes increase at first and then decrease with time. An inflection point is observed in the reliability index curves when the steel reinforcement starts to corrosion， leading to an obvious decrease in the flexural capacity.

Key words: SFRC beam, long-term load, load-carrying capacity, time-dependent, reliability