Composite Action in Eccentrically Braced Frames

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Abstract
The behavior of composite floor beams in eccentrically braced steel frames (EBFs) subjected to severe cyclic loading was experimentally investigated. The objectives of this study were to assess the cyclic strength and ductility of links in composite floor systems, and to determine the extent of the floor‐slab participation in the response of EBFs to earthquake loading. Six short links with a composite floor slab, and two short, bare steel links were tested using two‐thirds‐scale EBF subassemblies. The composite links, designed using current provisions for short, bare steel links, were found to yield and dissipate energy primarily in shear, and have a greater cyclic capacity compared to bare steel links. Web buckling in the composite links was adequately controlled using bare‐steel‐link design criteria to assure cyclic ductility. The extent of slab damage in the composite specimens was remarkably small and occurred primarily in the vicinity of the link. The test results indicate that the floor slab by itse...

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