Behaviour of cold-formed-steel-framed walls and floors in standard fire resistance tests

Alfawakhiri, Farid

doi:10.22215/etd/2002-05029

Cited by 16 publications

(29 citation statements)

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“…Rockwool insulation typically provides much higher levels of insulation being formed from basalt or iron ore blast furnace slag to provide higher density. In order to develop suitable finite element models of composite LSF wall panels, thermal properties of insulation were summarized based on our experimental results and past research work [13][14][15]. When the proposed thermal conductivity and specific heat values of rockwool, glass fibre and cellulose fibre were used as input to the numerical models of composite panels based on SAFIR [9], their time-temperature profiles agreed well with corresponding fire test results from Kolarkar [5].…”

Section: Insulation Materialsmentioning

confidence: 82%

“…The temperature increase of a steel member is a function of its thermal conductivity and specific heat. The precision in the determination of thermal properties of steel, such as specific heat and thermal conductivity, has little influence on the thermal modelling of LSF walls under fire conditions since steel framing plays a minor role in the overall heat transfer mechanism of the LSF wall assembly [15]. The properties of steel within the SAFIR code are obtained from those given in Eurocodes [17].…”

Section: Steelmentioning

confidence: 99%

“…Recently many numerical heat transfer models have been developed [9,15]. There are also many general finite element packages that can be used for thermal analyses.…”

Section: Numerical Studies Of Load Bearing Lsf Walls 41 Generalmentioning

confidence: 99%

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Thermal Performance of Load Bearing Cold-formed Steel Walls under Fire Conditions using Numerical Studies

Keerthan¹,

Mahendran²

2014

Journal of Structural Fire Engineering

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Cold-formed Light gauge Steel Frame (LSF) wall systems are increasingly used in lowrise and multi-storey buildings and hence their fire safety has become important in the design of buildings. A composite LSF wall panel system was developed recently, where a thin insulation was sandwiched between two plasterboards to improve the fire performance of LSF walls. Many experimental and numerical studies have been undertaken to investigate the fire performance of non-load bearing LSF wall under standard conditions. However, only limited research has been undertaken to investigate the fire performance of load bearing LSF walls under standard and realistic design fire conditions. Therefore in this research, finite element thermal models of both the conventional load bearing LSF wall panels with cavity insulation and the innovative LSF composite wall panel were developed to simulate their thermal behaviour under standard and realistic design fire conditions. Suitable thermal properties were proposed for plasterboards and insulations based on laboratory tests and available literature. The developed models were then validated by comparing their results with available fire test results of load bearing LSF wall. This paper presents the details of the developed finite element models of load bearing LSF wall panels and the thermal analysis results. It shows that finite element models can be used to simulate the thermal behaviour of load bearing LSF walls with varying configurations of insulations and plasterboards. Failure times of load bearing LSF walls were also predicted based on the results from finite element thermal analyses. Finite element analysis results show that the use of cavity insulation was detrimental to the fire rating of LSF walls while the use of external insulation offered superior thermal protection to them. Effects of realistic design fire conditions are also presented in this paper.

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Section: Insulation Materialsmentioning

confidence: 82%

Section: Steelmentioning

confidence: 99%

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Thermal Performance of Load Bearing Cold-formed Steel Walls under Fire Conditions using Numerical Studies

Keerthan¹,

Mahendran²

2014

Journal of Structural Fire Engineering

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“…Therefore it is important that suitable design rules that consider all these effects are available to predict the axial compression strength of LSF wall studs and the failure times of LSF walls under standard fire conditions. Many researchers [1][2][3][4][5][6][7][8] have proposed fire design rules for LSF walls subjected to nonuniform temperature distributions under standard fire. Klippstein [1] and Gerlich et al [2] developed their fire design rules based on the AISI design manual while Eurocode 3 was used in references [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Review of current fire design rules for cold-formed steel wall systems

Gunalan

Mahendran

2013

Journal of Fire Sciences

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Light gauge steel frame (LSF) wall systems are commonly used in industrial and commercial buildings and there is a need for simple fire design rules to predict their load capacities and fire resistance ratings. During fire events, the LSF wall studs are subjected to non-uniform temperature distributions that cause thermal bowing, neutral axis shift and magnification effects and thus resulting in a combined axial compression and bending action on the studs. In this research a series of full scale fire tests was conducted first to evaluate the performance of LSF wall systems with eight different wall configurations under standard fire conditions. Finite element models of LSF walls were then developed, analysed under transient and steady state conditions, and validated using full scale fire tests. Using the results from fire tests and finite element analyses, a detailed investigation was undertaken into the prediction of axial compression strength and failure times of LSF wall studs in standard fires using the available fire design rules based on Australian, American and European standards. The results from both fire tests and finite element analyses were used to investigate the ability of these fire design rules to include the complex effects of non-uniform temperature distributions and their accuracy in predicting the axial compression strength of wall studs and the failure times.The measured time-temperature profiles in the fire tests were used in all the calculations.Suitable modifications were then proposed to the fire design rules. This paper presents the details of this investigation on the fire design rules of LSF walls and the results.

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“…In recent years, a growing number of mid-rise buildings have been framed with CFS wall systems as the primary load-bearing structural components [2][3][4]. In parallel to the great demand for CFS wall systems, the understanding and requirements of fire performance of such structural systems receive increasing concerns in fire safety design of buildings.…”

Section: Introductionmentioning

confidence: 99%

Full-scale fire experiments on load-bearing cold-formed steel walls lined with different panels

Chen

Bai

et al. 2012

Journal of Constructional Steel Research

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Behaviour of cold-formed-steel-framed walls and floors in standard fire resistance tests

Cited by 16 publications

References 0 publications

Thermal Performance of Load Bearing Cold-formed Steel Walls under Fire Conditions using Numerical Studies

Thermal Performance of Load Bearing Cold-formed Steel Walls under Fire Conditions using Numerical Studies

Review of current fire design rules for cold-formed steel wall systems

Full-scale fire experiments on load-bearing cold-formed steel walls lined with different panels

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