Fatigue damage prognosis of steel bridges under traffic loading using a time-based crack growth method

•A time-based crack growth method for fatigue damage prognosis of steel bridges is proposed.•The proposed method can perform time-based fatigue crack growth analysis without cycle counting.•Full-scale coupled vehicle-bridge interaction framework is adopted for numerical demonstration.•Case study on the fatigue damage prognosis of the I-10 Twin Span Bridge in Louisiana is presented.