Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Structural fire resistance of partially restrained, partially composite floor beams, I: Experiments
Abstract This paper is Part 1 of a two-part investigation of the structural fire resistance of a partially composite, one-way spanning steel floor beam assembly with partial translational and rotational end restraint provided by shear tab connections to a supporting frame. The goal of this study is to provide experimental data and validated numerical models that can aid the implementation of performance-based design and evaluation approaches for structural fire resistance of steel-framed composite floor systems that are typical of North American building practice. This paper describes a pair of experimental tests on structurally identical composite floor specimens that are subjected to fire via a large modular furnace. A subsequent companion paper (Part 2) presents the numerical studies. One specimen was designed to conform to a 2-h fire rating as prescribed by UL Design No. D902 – the other was tested with no passive fire protection (i.e. as bare steel). Both specimens were flexurally loaded and tested to structural failure under exposure to the ASTM E119 standard fire, and the experimental results are evaluated using the ASTM E119 thermal and structural failure criteria. The test results show similar correlations of midspan deflection to beam temperature for both specimens. The shear tab connections experienced permanent deformation but maintained adequate structural integrity to allow the specimens to reach flexural failure. Neither shear slip nor localized cracking could be visibly detected at the composite stud locations during post-test inspection, indicating that composite action was maintained up to flexural failure.
Highlights 2 structurally identical composite floor beams were fire tested to flexural failure. Passive fire protection was applied to one specimen, and the other was unprotected. Both partially restrained specimens had similar temperature vs. deflection behavior. Bolted shear connections has some permanent deformation but maintained integrity. Results are used to validate modeling approaches in a subsequent companion paper.
Structural fire resistance of partially restrained, partially composite floor beams, I: Experiments
Abstract This paper is Part 1 of a two-part investigation of the structural fire resistance of a partially composite, one-way spanning steel floor beam assembly with partial translational and rotational end restraint provided by shear tab connections to a supporting frame. The goal of this study is to provide experimental data and validated numerical models that can aid the implementation of performance-based design and evaluation approaches for structural fire resistance of steel-framed composite floor systems that are typical of North American building practice. This paper describes a pair of experimental tests on structurally identical composite floor specimens that are subjected to fire via a large modular furnace. A subsequent companion paper (Part 2) presents the numerical studies. One specimen was designed to conform to a 2-h fire rating as prescribed by UL Design No. D902 – the other was tested with no passive fire protection (i.e. as bare steel). Both specimens were flexurally loaded and tested to structural failure under exposure to the ASTM E119 standard fire, and the experimental results are evaluated using the ASTM E119 thermal and structural failure criteria. The test results show similar correlations of midspan deflection to beam temperature for both specimens. The shear tab connections experienced permanent deformation but maintained adequate structural integrity to allow the specimens to reach flexural failure. Neither shear slip nor localized cracking could be visibly detected at the composite stud locations during post-test inspection, indicating that composite action was maintained up to flexural failure.
Highlights 2 structurally identical composite floor beams were fire tested to flexural failure. Passive fire protection was applied to one specimen, and the other was unprotected. Both partially restrained specimens had similar temperature vs. deflection behavior. Bolted shear connections has some permanent deformation but maintained integrity. Results are used to validate modeling approaches in a subsequent companion paper.
Structural fire resistance of partially restrained, partially composite floor beams, I: Experiments
Kordosky, Amy N. (Autor:in) / Drury, Michael M. (Autor:in) / Quiel, Spencer E. (Autor:in)
11.01.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch