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Compartment Fire Experiments on Long-Span Composite-Beams with Simple Shear Connections Part 1: Experiment Design and Beam Behavior at Ambient Temperature



Selvarajah Ramesh, Lisa Y. Choe, Mina S. Seif, Matthew S. Hoehler, William L. Grosshandler, Ana Sauca, Matthew F. Bundy, William E. Luecke, Yi Bao, Matthew Klegseth, Genda Chen, John Reilly, Branko Glisic


The National Institute of Standards and Technology recently expanded its large-scale structural-fire testing capabilities in the National Fire Research Laboratory. A landmark test series was conducted on long-span steel-concrete composite floor beams designed and constructed following U.S. building codes and standards. The test program consisted of five 12.8 m long composite floor beam specimens with various end support conditions. Each specimen was constructed as a partially-composite beam consisting of a W18x35 steel beam and an 83 mm thick lightweight concrete slab cast on top of 76 mm deep ribbed steel decking units. Test variables included two types of simple shear connections (shear-tab and welded/bolted double-angle connections) and the slab continuity over the girders. Simultaneous mechanical and fire loading was applied to the specimens. The measurements focused on evaluation of the characteristics of the fire loading, temperatures, and structural responses of the specimens to fires.
Technical Note (NIST TN) - 2054
Report Number


Fire, Composite beam, Floor slab, Connection, Experimental testing, Failure
Created October 22, 2019, Updated February 6, 2020