Abstract
The purpose of this paper was to calculate the fatigue lives of highway steel bridges using a reliability-based methodology. An HS20-44 truck model with 12 degrees of freedom was developed and used in the analysis. Both noncomposite and composite steel beam, 60 ft (18.3 m) long, highway bridges were adopted in this study. Two percent of critical damping was assumed for the bridges. The road surface roughness of the approach roadways and bridge decks was generated from a power spectral density (PSD) function for very good, good, average, and poor roads in accordance with International Organization for Standardization (ISO) specifications. The fatigue life of both noncomposite and composite steel beam bridges for different vehicle speeds and classes of road surface roughness is calculated from the generated stress time-histories.
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