NUMERICAL ANALYSIS OF A COMPOSITE STEEL BOX GIRDER BRIDGE IN FIRE

Nicole Leo Braxtan, Qian Wang, Reeves Whitney, Gregory Koch

Abstract


Box girder bridges are becoming more common because of their ease of construction, pleasing appearance, and serviceability. Projects with curved configuration and long spans can especially benefit from these advantages. However, the industry lacks a wide range of research on multi-span steel box girder cross-sections and their response to fire events. This poses a major risk to unprotected steel bridges using a box girder design. This paper will discuss a mathematical approach to determining and classifying different failure modes of weathering steel box girder bridges subject to two fire cases. Due to the rapid increase of temperature in the thin steel members, the strength of the steel deteriorates quickly. Results show that different fire locations can greatly affect the forces that act on the individual members of the structure.

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