Behavior and Limit States of Long-Span Composite Floor Beams with Simple Shear Connections Subject to Compartment Fires: Experimental Evaluation

Choe, Lisa; Ramesh, Selvarajah; Grosshandler, William L.; Hoehler, Matthew S.; Seif, Mina; Gross, John L.; Bundy, Matthew F.

doi:10.1061/(asce)st.1943-541x.0002627

Cited by 21 publications

(23 citation statements)

References 5 publications

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“…The experimental study performed by Yu et al (2009) was selected for benchmarking to evaluate the behavior of the gap/contact component and the entire component model when a combination of shear force, axial force, and bending moment is applied at ambient and elevated temperatures. The component model was then applied to simulate the behavior of a two-dimensional (2D) frame with a long-span composite beam and shear tab connections exposed to a fire scenario (Choe et al, 2019).…”

Section: Benchmarking Component Models Against Experimental Datamentioning

confidence: 99%

“…The component model implemented in OpenSees and benchmarked again Hu and Engelhardt (2014) and Yu et al (2009) was then used to simulate a 2D frame consisting of a composite beam with shear tab connections (Choe et al, 2019). The test assembly consisted of a W18×35 steel beam with 6.25-in.-deep concrete on metal deck that included a 3-in.-deep metal deck (Figure 16).…”

Section: Nist Composite Beam Tests: Choe Et Almentioning

confidence: 99%

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Component Modeling for Fire Behavior of Shear Tab Connections

Gordon,

Fischer

2023

Eng J

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During a building fire scenario, the behavior and capacity of gravity connections can significantly contribute to the integrity of steel-framed building structures. Because gravity connections are subjected to axial and flexural force demands and have a limited rotational capacity due to large beam rotations during a fire scenario, a connection model is needed to simulate their behavior when using analytical models to simulate the behavior of a steel structure in fire. This study develops a component model for shear tab connections at ambient and elevated temperatures in the opensource finite element program, OpenSees, to further enable the use of OpenSees for simulating steel structures in fire. Although the developed component model is not limited to implementation within OpenSees. The developed component model is benchmarked against experimental tests of isolated connections and a structural assembly with shear tab connections subjected to mechanical and thermal loads. Through benchmarking, it is shown that (1) the developed component model could be used to simulate connection behavior during a fire scenario and (2) simulating the ductility of connections and connecting components due to damage is critical when simulating the behavior of shear tab connections exposed to fire.

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Section: Benchmarking Component Models Against Experimental Datamentioning

confidence: 99%

Section: Nist Composite Beam Tests: Choe Et Almentioning

confidence: 99%

Component Modeling for Fire Behavior of Shear Tab Connections

Gordon,

Fischer

2023

Eng J

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“…The Phase I study was completed in 2018 (Ramesh et al 2019;Choe et al 2020), and the Phase II study is currently in progress.…”

Section: Research Motivationmentioning

confidence: 99%

“…The test floor assembly was exposed to a compartment fire simulating the standard temperaturetime curve (ASTM E119 or ISO834). Similar to the Phase I composite beam study, natural gas was used as a fuel because it allowed independent and near-instantaneous control of heat release rate during the experiment (Choe et al 2020).…”

Section: Test Firementioning

confidence: 99%

Fire resilience of a steel-concrete composite floor system :

Choe¹,

Ramesh²,

Dai³

et al. 2021

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The policy of the National Institute of Standards and Technology is to use metric units in all its published materials. Because this report is intended for the U.S. building construction industry, in some cases U.S. customary units are used.Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose.The policy of the National Institute of Standards and Technology is to include statements of uncertainty with all NIST measurements. In this document, some measurements made by authors outside of NIST are presented, for which uncertainties are not reported and are unknown.

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“…The National Institute of Standards and Technology (NIST) is, therefore, conducting a series of large-scale experiments to investigate the behavior and limit states of full-scale structural steel frames with composite floors exposed to compartment fires. This test program consists of two parts: In Phase 1, the structural fire performance of the 12.8 m long composite beams with simple shear connections was studied (Ramesh et al , 2019; Choe et al ., 2019; Choe et al , 2020). Phase 2 study is currently in progress to conduct compartment fire tests on a full-scale two-story structural steel gravity frame with composite floors.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on fire resistance of a full-scale composite floor assembly in a two-story steel framed building

Choe

Ramesh

Dai

et al. 2021

JSFE

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PurposeThe purpose of this paper is to report the first of four planned fire experiments on the 9.1 × 6.1 m steel composite floor assembly as part of the two-story steel framed building constructed at the National Fire Research Laboratory.Design/methodology/approachThe fire experiment was aimed to quantify the fire resistance and behavior of full-scale steel–concrete composite floor systems commonly built in the USA. The test floor assembly, designed and constructed for the 2-h fire resistance rating, was tested to failure under a natural gas fueled compartment fire and simultaneously applied mechanical loads.FindingsAlthough the protected steel beams and girders achieved matching or superior performance compared to the prescribed limits of temperatures and displacements used in standard fire testing, the composite slab developed a central breach approximately at a half of the specified rating period. A minimum area of the shrinkage reinforcement (60 mm2/m) currently permitted in the US construction practice may be insufficient to maintain structural integrity of a full-scale composite floor system under the 2-h standard fire exposure.Originality/valueThis work was the first-of-kind fire experiment conducted in the USA to study the full system-level structural performance of a composite floor system subjected to compartment fire using natural gas as fuel to mimic a standard fire environment.

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Behavior and Limit States of Long-Span Composite Floor Beams with Simple Shear Connections Subject to Compartment Fires: Experimental Evaluation

Cited by 21 publications

References 5 publications

Component Modeling for Fire Behavior of Shear Tab Connections

Component Modeling for Fire Behavior of Shear Tab Connections

Fire resilience of a steel-concrete composite floor system :

Experimental study on fire resistance of a full-scale composite floor assembly in a two-story steel framed building

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