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Assessment of Structural Steel’s Properties in a Railway Plate Girder Bridge

Abstract The material properties of structural steel in a railway bridge constructed in 1872 were determined for the upgrade of the bridge. The riveted superstructure of the bridge consists of six simply supported spans of similar structure but constructed at different periods, with four spans replaced during service. The bridge spans have degraded at different rates, which was clearly observed in the extent of the corrosion. To find the material properties of the steel, laboratory tests were undertaken, with chemical composition, strength, hardness and toughness verified for each span. Surprisingly, despite their similar structure, the spans utilise different types of steel, which not only take into account strength but also toughness. The material testing undertaken allowed some uncertainties regarding the structural steels used in the bridge to be cleared up and the necessity for strengthening the two newest spans to be confirmed. As some upgrading work was expected to be performed through welding, the weldability of the steels was also checked.