Behaviour of Aluminium Alloy Structures Under Fire

Faggiano, Beatrice; Matteis, Gianfranco De; Landolfo, Raffaele; Mazzolani, Federico M.

doi:10.3846/13923730.2004.9636305

Cited by 10 publications

(14 citation statements)

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“…Figure 6 gives Z (on logarithmic scale) as a function of the stress. Equations [5] and [6] are proposed for alloys 5083-H111 and 6060-T66, with Z in (/min) Z ¼ 6:7Á10 10 The preceding results are obtained from the creep tests heated and loaded directly (i.e., tests of Table II). This section gives the results of the tests that are subjected to an elevated temperature for 90 minutes prior to loading.…”

Section: Experimental Results Of Creep Testsmentioning

confidence: 99%

“…[4] Values for the hardening factor of the Ramberg-Osgood relation for aluminum alloys at elevated temperature are determined and used in the fire design of frames. [5] However, the temperature and load history in steadystate test are not representative for a fire. Transient state tests are usually considered as appropriate tests for simulation of fire conditions.…”

Section: Introductionmentioning

confidence: 99%

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Constitutive Model for Aluminum Alloys Exposed to Fire Conditions

Maljaars

Soetens

Katgerman

2008

Metall Mater Trans A

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An existing constitutive model for creep, developed by Dorn and Harmathy, is modified in order to be used for fire-exposed aluminum alloys. Two alloys, 5083-O/H111 and 6060-T66, are selected for the development of this constitutive model because of their different behavior at elevated temperature and their frequent application in structures for which fire design is relevant. The material parameters in the model are calibrated with the experimental results of creep tests, carried out with constant load and temperature in time. The model is validated with socalled transient state tests, with a constant load in time (stresses ranging from 20 to 150 N/mm 2 ) and with an increasing temperature (with heating rates ranging from 1.6°C/min to 11°C/min and critical temperatures ranging from 170°C to 380°C). These tests are considered as representative for fire-exposed, insulated aluminum members. The existing constitutive model of Dorn and Harmathy provides good agreement with the transient state tests carried out for the 5xxx series alloy, but appeared to be not suited for the 6xxx series alloy. This is attributed to the early development of tertiary creep in case of 6xxx series alloys. The existing model was modified to incorporate this first stage of tertiary creep, to arrive at a good agreement between the tests and the modified model for 6xxx series alloys.

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Section: Experimental Results Of Creep Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constitutive Model for Aluminum Alloys Exposed to Fire Conditions

Maljaars

Soetens

Katgerman

2008

Metall Mater Trans A

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“…According to the studies of Faggiano et al . , at high temperatures, the n value has little influence on the stress–strain relationship for heat‐treated alloys and significant influence on this relationship for other types of alloys. The variation of n value with temperature provided by Maljaars et al .…”

Section: Mechanical Analysismentioning

confidence: 99%

“…Faggiano et al . used the Ramberg–Osgood law to describe a constitutive model for aluminium alloys at high temperatures and provided values of strain hardening factor n for different alloy series as a function of temperature. Amdahl et al .…”

Section: Introductionmentioning

confidence: 99%

The fire performance and fire‐resistance design of aluminium alloy I‐beams

Zheng

Zhang

2014

Fire and Materials

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Summary In this paper, the temperature fields of unprotected and protected aluminium‐alloy I‐beams heated on three sides were calculated using the finite element method. The calculated temperature results were compared with the incremental temperature rise formulas specified in Eurocode 9. Next, finite element models were developed to simulate the flexural behaviour and the flexural–torsional buckling behaviour of aluminium‐alloy I‐beams under fire. The calculated results were validated by experimental data acquired at both ambient and high temperatures. Subsequently, simplified formulas for calculating critical temperatures for 5083‐H112 and 6060‐T66 aluminium‐alloy beams were proposed based on parametric analysis, and the results obtained using these formulas were compared against equivalent values calculated in accordance with Eurocode 9 standards. In terms of engineering applications, findings indicate that increases in the load level, the global stability coefficient, and the ratio of fireboard thickness to thermal conductivity reduce the critical temperatures of aluminium‐alloy beams. In most cases, designs using the method of checking load bearing capacity at high temperature published in the Eurocode 9 would tend to be conservative. Finally, when the global stability coefficient was greater than 0.8, the critical temperatures in some regions measured slightly higher than the calculated simplified value. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Structural aluminium alloys lose more than one‐half of their stiffness and yield stress at temperatures above 250–300 °C, which is well below the flame temperature of cellulosic or hydrocarbon fires. Structural models have been developed and experimental tests performed to assess the deformation and failure of unwelded aluminium plates, beams and other components exposed to fire . FE models are capable of computing the deformation, buckling, and collapse of aluminium structures under combined compression loading and fire exposure.…”

Section: Introductionmentioning

confidence: 99%

Fire structural modelling and testing of welded aluminium plate

et al. 2014

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Summary The structural response of welded aluminium in fire is computationally and experimentally analysed. A finite element (FE) model is developed to compute the deformation and failure of gas metal arc welded (GMAW) aluminium plate under combined loading and one‐sided unsteady‐state heating representative of fire. The FE model predicts the deformation of the weld, heat‐affected zone and parent plate based on the combined effects of elastic softening, plastic softening and creep. The effects of residual stresses in the weld and thermal expansion on the deformation response are also analysed. The numerical accuracy of the model is rigorously evaluated using a large amount of deformation and failure stress data obtained from fire structural tests performed with welded AA5083–AA5083, AA5083–AA6061 and AA6061–AA6061 plates. Good agreement is found between results computed with the FE model and experimental testing. The results reveal that GMAW welds do not reduce the structural performance of aluminium in fire unless the maximum temperature remains below the recrystallisation temperature. Copyright © 2014 John Wiley & Sons, Ltd.

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Behaviour of Aluminium Alloy Structures Under Fire

Cited by 10 publications

References 0 publications

Constitutive Model for Aluminum Alloys Exposed to Fire Conditions

Constitutive Model for Aluminum Alloys Exposed to Fire Conditions

The fire performance and fire‐resistance design of aluminium alloy I‐beams

Fire structural modelling and testing of welded aluminium plate

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