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Fire tests of steel tension rod systems with intumescent coating

Mai Häßler (7.3 Fire Engineering, Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany and I 3 Metal construction, Composite construction, Bearings, Glass construction, Deutsches Institut für Bautechnik, Berlin, Germany)
Dustin Häßler (7.3 Fire Engineering, Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany)
Sascha Hothan (7.3 Fire Engineering, Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany)
Simone Krüger (7.5 Technical Properties of Polymeric Materials, Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Publication date: 5 August 2019

Abstract

Purpose

The purpose of this paper is to investigate the performance of intumescent coating on tension rod systems and their components. Steel tension rod systems consist of tension rods, fork end connectors and associated intersection or gusset plates. In case of fire, beside the tension rods themselves, the connection parts require appropriate fire protection. Intumescent fire protection coatings prevent a rapid heating of the steel and help secure the structural load-carrying capacity. Because the connection components of tension rod systems feature surface curvature and a complex geometry, high demand is placed on the intumescence and thermal protection performance of the coatings.

Design/methodology/approach

In this paper, experimental studies were carried out for steel tension rod systems with intumescent coating. The examined aspects include the foaming and cracking behaviour, the influence of different dry film thicknesses, the heating rate of the steel connecting parts in comparison to the tension rods, and the mounting orientation of the tension rods together with their fork end connectors.

Findings

The results show that a decrease in surface curvature and/or an increase in mass concentration of the steel components leads to a lower heating rate of the steel. Moreover, the performance of the intumescent coating on tension rod systems is influenced by the mounting orientation of the steel components.

Originality/value

The findings based on fire tests contribute to a better understanding of the intumescent coating performance on connection components of tension rod systems. This subject has not been extensively studied yet.

Keywords

Acknowledgements

The authors would like to acknowledge the supply of the tension rod system specimens by PFEIFER Seil- und Hebetechnik GmbH and the application of the intumescent coating on the test specimens by Rudolf Hensel GmbH.

Citation

Häßler, M., Häßler, D., Hothan, S. and Krüger, S. (2019), "Fire tests of steel tension rod systems with intumescent coating", Journal of Structural Fire Engineering, Vol. 11 No. 1, pp. 22-32. https://doi.org/10.1108/JSFE-01-2019-0005

Publisher

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Emerald Publishing Limited

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