Reduction of Connection Resistance During Veselí Fire Tests

Jána, Tomáš; Wald, František

doi:10.1260/2040-2317.6.1.21

Journal of Structural Fire Engineering

2015

DOI: 10.1260/2040-2317.6.1.21

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Reduction of Connection Resistance During Veselí Fire Tests

Tomáš Jána¹,

František Wald²

Abstract: The paper is focused to the temperature distribution in the reverse channel connections to concrete filled tubular column during two fire tests on an experimental building in Veselí nad Lužnicí. Temperatures of connections without fire protection as well as fire protected connections were investigated. The connected beams and columns were without fire protection.

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Cited by 4 publications

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Thermal and Structural Response of Beam-end Shear Connections During a Large Compartment Fire Experiment

et al. 2023

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The role of steel connections is essential in structural fire design and analysis for steel-framed composite structures. The current structural design provisions provide strength reduction factors of load-carrying members and their end-connection elements at elevated temperatures, based on small-scale experiments under uniform heating conditions. The realistic thermal and structural evolution in member connections, especially as part of full-scale floor assemblies exposed to a large compartment fire, has not been well characterized. A large compartment fire experiment was recently conducted on a 9.1 m by 6.1 m composite floor assembly as part of a two-story steel-framed building. The test assembly had a total of ten shear-tab (fin-plate) connections subjected to combined fire and mechanical loading. This paper presents the measured thermal response of these connections to fire and comparison with the corresponding Eurocode 3 predictions with two methods (1) incorporating the beam bottom flange temperature at midspan and (2) the section factor method. The results show that the Eurocode 3 methods conservatively predict the maximum temperature during heating and the cooling rate but overestimate the high-temperature strength of connections when estimated using the section factor method, showing that the Eurocode 3 simplified approaches are not meant to provide the details of the failure mode for connections. This study suggests that estimating the strength of connections using strength reduction factors may not guarantee a safe structural fire design. In addition, this paper estimated the total axial force (from slab and beam) at the composite connection via using the strain gauge measurements close to the column bases which were not exposed to fire. It suggests realistic axial load and rotational demand on the shear connection due to restraints to thermal elongation or contraction of supported members should be considered in future design guidance as should designing and detailing the connections for ductility to withstand the inelastic deformation demands during the heating and the cooling phases.

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Thermal and Structural Response of Beam-end Shear Connections During a Large Compartment Fire Experiment

et al. 2023

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Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests

Jána

Wang

Wald

et al. 2015

Fire Safety Journal

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Beam-to-CFST column joints in steel-concrete composite buildings: A comprehensive review

Thai

2024

Structures

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Reduction of Connection Resistance During Veselí Fire Tests

Cited by 4 publications

References 2 publications

Thermal and Structural Response of Beam-end Shear Connections During a Large Compartment Fire Experiment

Thermal and Structural Response of Beam-end Shear Connections During a Large Compartment Fire Experiment

Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests

Beam-to-CFST column joints in steel-concrete composite buildings: A comprehensive review

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