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Comparative Behavior of Fire-Exposed Composite Girders Subjected to Flexural and Shear Loading
Abstract
This paper presents results from experimental studies on the comparative behavior of fire exposed composite steel girders subjected to flexural and shear loading. Three composite girders, comprising of steel girders and concrete slab, were tested under simultaneous structural loading and fire exposure. The main test variables are type and magnitude of loading, as well as level of composite action. The composite girder, mainly subjected to flexural loading, failed through flexural yielding of steel girder without any signs of shear failure. On the other hand, girders with shear loading failed in shear through shear web buckling early into fire exposure. A comparative performance evaluation of response parameters clearly shows that shear limit state should be considered when evaluating behavior of fire exposed composite girders.