Formulation of Impact Coefficient for Fatigue Design of Steel Highway Bridges Based on Dynamic Response Analysis to a Moving Vehicle and Monte Carlo Method

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The current Japanese design code specifies the impact factor as a function of only span length. The fatigue design recommendation specifies impact factor as a half of the value determined in the design code based on the judgment that its average value should be used for fatigue design. However, it is not clearly shown that this value represents adequately dynamic influence on fatigue damage.In this study, influence of bridge span, road surface condition, vehicle speed and vehicle model on the impact factor for fatigue design is elucidated by using a calculation method combining Monte Carlo simulation and dynamic response analysis of bridge-vehicle system . Moreover, a new formula of impact factor for fatigue design is proposed as a function of frequency ratio.