Fracture Sensitivity of Dynamically Loaded Girders

by Donald S. Mansell, (M.ASCE), Prof. and Head; Civ. Engrg. Dept., Papua New Guinea Univ. of Tech., Lae, Papua, New Guinea,
Peter Dobos, Engr.; Lewis Constr. Co., Victoria, Australia,


Serial Information: Journal of the Structural Division, 1975, Vol. 101, Issue 12, Pg. 2523-2535


Document Type: Journal Paper

Abstract: The effect of dynamic traffic loads on the brittleness of steel highway bridge girders is found to be considerable if fracture initiation is taken as the criterion of brittleness. The effect on propagation of these fractures is less dramatic. A universal beam section was used for the experiment. It was found that a strain rate increase from 30 x 10-6s-¹ to 30 x 10-³s-¹ caused a shift of25°C (45°F) in the highest temperature for fracture initiation, while the highest temperature for complete fracture at certain strain levels was shifted by only 10°C (18°F).

Subject Headings: Dynamic loads | Cracking | Brittleness | Steel bridges | Highway bridges | Girder bridges | Strain rates

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