Fire resistance of composite non-load bearing light steel framing walls

Khetata, Seddik M; Piloto, P.A.G.; Gavilán, Ana Belén Ramos

doi:10.1177/0734904119900931

Cited by 14 publications

(14 citation statements)

References 11 publications

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“…Based on previous numerical research [16], the extra boundary condition is applied to all the internal surfaces of the cavity. The convection coefficient is set to be α c = 17 (W/m 2 K) and the emissivity of the flames is ε f = 1.0, assuming that the bulk temperature of the cavity is following the fire cavity curves defined in Fig.…”

Section: Finite Element Model For Thermal Analysismentioning

confidence: 99%

“…This numerical investigation deals with two different levels of fire protection applied to LTFW, evaluating the load bearing capacity for different fire rated times. The simulations are based on a two-step simulation process, submitting the LTFW under the thermal effect of the fire, using two experimental fire scenarios used for LSF (Light Steel Frame) walls developed by Piloto et al [15] and Khetata et al [16] (single layer protection during 60 min and double layer protection during 120 min) and then for each fire rated time a thermomechanical analysis is developed to determine the load bearing capacity. For the first fire scenario, the load bearing capacity is determined for R30 and R60, while for the second fire scenario, the load bearing capacity may be determined for R30, R60, R90 and R120.…”

Section: Introductionmentioning

confidence: 99%

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Load Bearing Capacity of Light Timber Frame Walls Under Fire

Piloto

Fonseca

2022

Math.Comput.Sci.

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Light Timer Frame Walls are made of solid timber elements and are usually fire protected by other materials. This investigation determines the residual load bearing capacity of Light Timber Frame Walls for fire rating periods of 30, 60, 90 and 120 min. The timber frame is made with 3 studs and 2 tracks, using two different fire protection levels (one and two gypsum layers). The computational model includes the thermal analysis under standard fire, including all types of materials and a sequential mechanical analysis with incremental load applied for each fire rating periods, applied just for the load bearing material. Nonlinear solution methods are used with small tolerance values for solution convergence, to determine the correct temperature and displacement fields. The thermal and the mechanical properties are considered temperature dependent. The mechanical analysis considers large displacement behaviour, and the charring effect of wood is included by the reduction of the stiffness and strength of the timber. The results show that the load bearing capacity decreases with the fire exposure time. A new proposal is presented between the load bearing capacity and the fire rating and finally the char layer is compared with the current and future version of Eurocode 5, part 1.2.

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Section: Finite Element Model For Thermal Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Load Bearing Capacity of Light Timber Frame Walls Under Fire

Piloto

Fonseca

2022

Math.Comput.Sci.

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“…Temperature field of the unexposed surfaces of (A) Specimen 5 and (B) Specimen 7 obtained with the infrared measurements after 70 minutes of fire exposure previous numerical research, 34 and perfect contact is assumed between adjacent elements.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…As convection and radiation occur in LSF wall cavities, convection and radiation boundary conditions must be addressed to these regions, as shown in the following Figure 19. Thus, based on previous numerical research, 34 for the exposed stud row, the film coefficient in the plasterboard-cavity interface as well as in the steel areas oriented toward the cavity was set to α cv = 17 (W/m 2 K). As for the surface areas on the unexposed stud row, the convection coefficient is α cv = 13 (W/m 2 K).…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Fire performance of non‐load‐bearing double‐stud light steel frame walls: Experimental tests, numerical simulation, and simplified method

et al. 2021

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SummaryDouble‐stud light steel frame (LSF) walls provide an enhanced insulation performance when exposed to fire conditions. However, the behavior of different configurations of such assemblies under fire is not well understood. Thus, this study aimed to assess the fire resistance of non‐load‐bearing double‐stud LSF walls subjected to ISO834 standard fire. The walls were lined with one or two type F gypsum plasterboards on each side, using cavity uninsulated or insulated with ceramic fiber. The experimental tests revealed that a wider cavity slows the heat transfer through the cross‐section, delaying the temperature rise on the unexposed surfaces. The use of ceramic fiber insulation substantially increases the fire resistance of the wall and when the cavity is partially filled with this material, if the blanket is placed towards the exposed side, enhanced insulation fire resistance is achieved. Based on the finite element method, a numerical validation was conducted using a special hybrid approach that used experimental temperature values inside the cavities or insulation blankets. This approximation was essential to improve the numerical results. Also, the employment of an air layer, located at specific regions of the models, helped to improve the numerical results, introducing an extra thermal resistance. A new simplified approach was proposed based on the improved design model available in the literature, and the results obtained are consistent with the experimental results. The predicted insulation fire resistance of the numerical and simplified methods agreed well with the experimental results and useful information is supplied to support further numerical and experimental studies.

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“…For columns and beams that do not require compartments between the rooms, the evaluation of fire resistance performance needs only consider the stability criterion [ 6 , 7 ]. For floors and walls that require compartments between the rooms, the three criteria must be simultaneously considered for the evaluation [ 8 , 9 , 10 ]. Compartments are important in a building because they prevent the internal spread of fire and help the structural members in the compartments to remain stable under fire conditions.…”

Section: Introductionmentioning

confidence: 99%

Fire Resistance Performance of Steel–Polymer Prefabricated Composite Floors Using Standard Fire Tests

Park

Alemayehu

2022

Polymers

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In this study, the fire resistance performance of steel–polymer prefabricated composite floors, which have a sandwich-type structure, was assessed via standard fire tests and analyzed using finite element analysis. This form of analysis should consider two aspects, namely the thermal and structural fields, so as to simulate complicated material properties and large deformations. As previous studies have already conducted analysis in the thermal field, this study entailed only the structural analysis based on the temperature distributions obtained from the thermal analysis. The variables of the specimens were the thicknesses of the top and bottom steel plates and polymers. According to the analysis results, the top steel plate thickness had no impact on the stability ratings, a criterion for fire resistance performance, whereas the bottom steel plate showed a linear correlation with the stability rating. An equation for the stability rating of composite floors was proposed, and an equation for fire resistance performance was devised based on the insulation ratings, which were obtained from the thermal analysis results.

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Fire resistance of composite non-load bearing light steel framing walls

Cited by 14 publications

References 11 publications

Load Bearing Capacity of Light Timber Frame Walls Under Fire

Load Bearing Capacity of Light Timber Frame Walls Under Fire

Fire performance of non‐load‐bearing double‐stud light steel frame walls: Experimental tests, numerical simulation, and simplified method

Fire Resistance Performance of Steel–Polymer Prefabricated Composite Floors Using Standard Fire Tests

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