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 Engineering Laboratory /                  Fire Research Division
      National Fire Research Laboratory

    
    Breadcrumb
        Fire Calorimetry Database (FCD)Steel-Concrete Composite Floor Systems Subject to Fire, Phase 1

            Research Overview
                                This study deals with compartment fire experiments on 12.8 m long composite floor beams with various end support conditions. Each specimen was constructed as a partially-composite beam, consisting of a lightweight concrete slab cast on 76 mm (3 in.) deep ribbed steel decking and a W18 x 35 steel beam acting compositely via 19 mm (3/4 in.) diameter steel headed stud anchors welded on the top flange. Test variables included two types of simple shear connections (shear-tab and welded-bolted double-angle connections) and the presence or absence of slab continuity over girders. Hydraulic actuators were used to apply gravity loads to the specimen under fire conditions. The natural gas-fueled burners were used to create a compartment fire with the maximum heat release rate of 4000 kW. This study evaluated the characteristics of the fire loading and thermal and structural responses of the specimens. The test results indicated that the thermal restraint conditions significantly affected the behavior and failure modes of the specimens with simple shear connections. The specimens resisted gravity loads at large vertical displacements near midspan (approximately a ratio of the span length over 20) without collapse under fire loading. Various limit states and vulnerabilities to fires were observed, including local buckling of the steel beams near supports, flexural failure (yielding of steel beams and concrete fracture near restrained end supports), and connection failure (weld shear or bolt shear) during heating and cooling which could lead to partial or total collapse of the floor system.


                  Choe. L. et al. Compartment Fire Experiments on Long-Span Composite-Beams with Simple Shear Connections Part 2: Test Results, NIST Technical Note 2055, 2019.
  https://doi.org/10.6028/NIST.TN.2055
                                        Project Website for Steel-Concrete Composite Floor Systems Subject to Fire - Phase 1.
  https://www.nist.gov/el/fire-research-division-73300/national-fire-research-laboratory-73306/steel-concrete-composite-0
  

      

      Experiment Name
                            Plot of Heat Release Rate
                                                  Ignition Photo
                                                  Date/Time
                                                  Specimen
                                                  Fuel Type
                            Test Duration (min)Sort descending
                            Total Heat Released (MJ)
                            Peak HRR (kW)CB-42-SP-4MW
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        02/13/2018 8:07:22 AM EST
                                                                                        Three box burners
                                                                                        Natural Gas
                            65.12
                            13,232
                            4,331CB-42-DA-4MW
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        data sync marc
                                                                                        12/19/2017 5:21:58 AM EST
                                                                                        Three box burners
                                                                                        Natural Gas
                            67.92
                            10,980
                            4,182CB-42-SP-SC-4MW
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        03/06/2018 8:10:52 AM EST
                                                                                        Three box burners
                                                                                        Natural Gas
                            80.00
                            14,803
                            4,312CB-42-DA-SC-4MW
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        01/12/2018 8:03:03 AM EST
                                                                                        Three box burners
                                                                                        Natural Gas
                            94.07
                            17,069
                            4,184

      Bryant, R. and Bundy, M. The NIST 20 MW Calorimetry Measurement System for Large-Fire Research, Technical Note (NIST TN) 2077, 2019https://doi.org/10.6028/NIST.TN.2077
        NIST Fire Calorimetry Database (FCD)https://doi.org/10.18434/mds2-2314

      Last Updated June 7, 2021
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