Collapse mechanisms of aluminium structures in fire : experiments on local buckling in bending for aluminium beams at ambient and elevated temperature

O.R. Meulen, van der

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Abstract

Presented in the present report is a description of the experiments performed on the local buckling behaviour of aluminium beams in fire. These experiments were performed as part of a larger research program that includes finite element simulations, interpretation of the data collected and should result in design recommendations for aluminium constructions for the fire load case. In this report the focus lies on the accurate and diligent description of the experiments and the data collected in them. All tests were performed on extruded aluminium profiles made from alloy AA6060-T66, which is a heat treated and artificially aged alloy used in the construction industry. Not counting the introduction, the report is divided into three chapters. The first, chapter 2 deals with the geometrical imperfections of the beams tested in the bending experiments. Knowledge of the shape and magnitude of these imperfections is required for accurate finite element simulations. A second requirement for these finite element simulations is precise knowledge of the material behaviour. A Dorn-Harmathy* creep based material model was proposed and calibrated for AA6060-T66 by Maljaars (2007a,b, 2008); Maljaars et al. (2008, 2009b, 2010) which may be used in situations where the structure is subjected to a load and the temperature is increased (linearly) to the elevated temperatures associated with fire. For situations where the load is applied after a specific elevated temperature has been reached, which is then held constant thereafter, this material model does not give sufficiently accurate results and experimentally derived stress-strain curves have to be used. The derivation of these elevated temperature stress-strain curves is presented in chapter 3. Finally in chapter 4 the main body of work; the bending experiments on thirty beams with varied cross-sections and test temperatures amongst others is presented.
Original languageEnglish
Place of PublicationEindhoven
PublisherEindhoven University of Technology
Publication statusPublished - 2012

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