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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 2

            Research Overview
                                A series of large compartment fire tests was performed to investigate the behavior and fire-induced failure mechanisms of full-scale composite floor assemblies with a two-story steel gravity frame, two bays by three bays in plan. A total of three 9.1 m Ã 6.1 m composite floor specimens with varying slab reinforcement and fire protection schemes for the secondary beam were tested under combined mechanical loads and compartment fire exposure. The first experiment (Test #1) was designed to achieve a 2-hour fire resistance rating per current U.S. practice and create baseline data for the behavior of the building. Test #1 specimen had the minimum specified reinforcement permitted in the U.S. for the composite slabs with profiled steel decks. Test #2 was conducted to study the effect of enhanced slab reinforcement with larger area and ductility on the fire resilience of the composite floor systems. Test #3 was conducted to study the effect of enhanced slab reinforcement as well as unprotected secondary beams on the fire resilience of the composite floor systems. Similar to Test #2, the floor slab in the test bay was reinforced with 9.5 mm diameter deformed bars with a center-to-center spacing of 30 cm. Unlike in Test #1 and Test #2, the secondary beam and its end connections in the test bay were left unprotected in Test #3.


                  Project Website for Steel-Concrete Composite Floor Systems Subject to Fire - Phase 2.
  https://www.nist.gov/el/fire-research-division-73300/national-fire-research-laboratory-73306/steel-concrete-composite
                                        Sauca, A. et al. Development of a Standard Fire Condition for a Large Compartment Floor Assembly. NIST Technical Note 2070, 2019
  https://doi.org/10.6028/NIST.TN.2070
                                        Choe, L., et al. Fire Resilience of a Steel-Concrete Composite Floor System: Full-Scale Experimental Evaluation for Influence of Slab Reinforcement (Test #2), NIST Technical Note 2203, 2022
  https://doi.org/10.6028/NIST.TN.2203
                                        Ramesh, S., et. Al. Fire Resilience of a Steel-Concrete Composite Floor System: Full-Scale Experimental Evaluation for Influence of Slab Reinforcement and Unprotected Secondary Beam (Test #3), NIST Technical Note 2267, 2023
  https://doi.org/10.6028/NIST.TN.2267
  

      

      Experiment Name
                            Plot of Heat Release Rate
                                                  Ignition Photo
                                                  Date/Time
                                                  Specimen
                                                  Fuel TypeSort ascending
                            Test Duration (min)
                            Total Heat Released (MJ)
                            Peak HRR (kW)15minRamp_R1
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        12/19/2018 5:43:01 AM EST
                                                                                        Four square burners
                                                                                        Natural Gas
                            16.22
                            5,047
                            8,03415minRamp_R2
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        12/19/2018 8:47:39 AM EST
                                                                                        Four square burners
                                                                                        Natural Gas
                            20.00
                            4,850
                            7,98060minRamp_R1
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        12/20/2018 4:22:34 AM EST
                                                                                        Four square burners
                                                                                        Natural Gas
                            76.48
                            37,631
                            10,317CompositeFloorTest_No1
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        11/14/2019 8:50:01 AM EST
                                                                                        Four square burners
                                                                                        Natural Gas
                            107.33
                            63,542
                            11,496CompositeFloorTest_No2
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        Ignition
                                                                                        03/10/2021 6:15:53 AM EST
                                                                                        Four square burners
                                                                                        Natural Gas
                            160.43
                            86,908
                            12,776CompositeFloorTest_No3
                            Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
                                                                                        horn
                                                                                        02/03/2022 6:54:03 AM EST
                                                                                        Four square burners
                                                                                        Natural Gas
                            145.28
                            90,480
                            12,124

      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 October 23, 2023
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