Fire Resistance of Timber Panel Structures Under Standard Fire Exposure

Suzuki, Junichi; Mizukami, Tensei; Naruse, Tomohiro; Araki, Yoshihiro

doi:10.1007/s10694-016-0578-2

Cited by 46 publications

(16 citation statements)

References 11 publications

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“…secondary bending), which depends not only on the cross section's geometry, but also on its effective length and flexural rigidity. A series of 8 loaded CLT wall elements exposed to standard furnace testing by Suzuki et al [25] all failed in global buckling, with runaway lateral deflections distinguishing the fire resistance times. Suzuki et al [25] used a sectional temperature analysis to predict the reductions in elastic modulus, and thus the reduction in buckling resistance, using a secant formula to account for loading eccentricities.…”

Section: Instability Effectsmentioning

confidence: 99%

“…A series of 8 loaded CLT wall elements exposed to standard furnace testing by Suzuki et al [25] all failed in global buckling, with runaway lateral deflections distinguishing the fire resistance times. Suzuki et al [25] used a sectional temperature analysis to predict the reductions in elastic modulus, and thus the reduction in buckling resistance, using a secant formula to account for loading eccentricities. This approach enabled them to make slightly conservative predictions of the failure time for most of their experimental results.…”

Section: Instability Effectsmentioning

confidence: 99%

“…For some of their results the predictions were unconservative but in general the secant approach enabled improved predictions compared to assessment based on Euler buckling formulae. Suzuki et al [25] also highlighted the importance of the outer layers in a fire-exposed wall to provide buckling resistance. A reduction in elastic modulus on heating (the rate of which with temperature is different than for strength) may reduce a CLT column or wall element's buckling capacity, and the ZSL approach, which lumps reductions in both strength and stiffness into a single ZSL depth based on tensile flexural strength reductions, is clearly unable to properly account for this.…”

Section: Instability Effectsmentioning

confidence: 99%

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Structural response of cross-laminated timber compression elements exposed to fire

Wiesner

Randmael

Wan

et al. 2017

Fire Safety Journal

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A set of novel structural fire tests on axially loaded cross-laminated timber (CLT) compression elements (walls), locally exposed to thermal radiation sufficient to cause sustained flaming combustion, are presented and discussed. Test specimens were subjected to a sustained compressive load, equivalent to 10 % or 20 % of their nominal ambient axial compressive capacity. The walls were then locally exposed to a nominal constant incident heat flux of 50 kW/m 2 over their mid height area until failure occurred. The axial and lateral deformations of the walls were measured and compared against predictions calculated using a finite Bernoulli beam element analysis, to shed light on the fundamental mechanics and needs for rational structural design of CLT compression elements in fire. For the walls tested herein, failure at both ambient and elevated temperature was due to global buckling. At high temperature failure results from excessive lateral deflections and second order flexural effects due to reductions the walls' effective crosssection and flexural rigidity, as well as a shift of the effective neutral axis in bending during fire. Measured average one-dimensional charring rates ranged between 0.82 and 1.0 mm/min in these tests. As expected, the lamellae configuration greatly influenced the walls' deformation responses and times to failure; with 3-ply walls failing earlier than those with 5-plies. The walls' deformation response during heating suggests that, if a conventional reduced cross section method (RCSM), zero strength layer analysis were undertaken, the required zero strength layer depths would range between 15.2 mm and 21.8 mm. Deflection paths further suggest that the concept of a zero strength layer is inadequate for properly capturing the mechanical response of fire-exposed CLT compression elements.

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Section: Instability Effectsmentioning

confidence: 99%

Section: Instability Effectsmentioning

confidence: 99%

Section: Instability Effectsmentioning

confidence: 99%

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Structural response of cross-laminated timber compression elements exposed to fire

Wiesner

Randmael

Wan

et al. 2017

Fire Safety Journal

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“…Suzuki et al . [6] conducted intricate experiments on the performance of various wood building elements exposed to standard fire exposures. These results are useful to the fire safety science community as most large-scale furnace test data is proprietary and not available in the open literature.…”

Section: Fire-structure Interaction (Fsi)mentioning

confidence: 99%

Special Issue on Operation Tomodachi—Fire Research

Manzello

Suzuki

2016

Fire Technol

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. Due to the success of the kickoff meeting, EL-NIST signed a Statement of Intent with JAFSE to hold two workshops, the first held in Tokyo in 2012 (see Manzello et al. [1] for a summary of that workshop), and the second on March 16-18, 2015. The objective of the relationship was to: (1) develop scientific knowledge and translate it to building codes and standards that will be of use to both countries to reduce the devastation caused by unwanted fires, (2) provide a forum for next generation researchers to present their work in order to develop research collaborations, (3) and allow participants a chance to visit.To this end, oral presentations were focused on two topics: large outdoor fires (LOF) and fire-structure interaction (FSI). Justifications on why these two topics were chosen are provided elsewhere [1]. In addition, poster sessions were held in the areas of LOF and FSI, as well as two general fire safety science poster sessions. All of the presentations were documented in a recent NIST Special Publication 1189 [2]. These presentations provide a flavor of some of state of the art research in LOF and FSI ongoing in both countries. 21 papers were submitted to the special issue, and 12 were accepted for publication.

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“…Structural fire guidance can be found in international codes for timber elements and assemblies [1,2]. However, full-scale tests and specific investigations are frequently required to assess their response under fire exposure conditions (see for example [3][4][5]), loading configurations, as well as to explore the reliability and potential of simplified design methods [6][7][8][9], novel timber-composite systems [10,11], modified material treatments [12], or thermal insulation methods [13,14]. Finite Element (FE) numerical modelling, in this regard, can offer robust support to full-scale testing, at least for preliminary fire resistance considerations [15][16][17][18][19].…”

Section: Introduction and State-of-the-artmentioning

confidence: 99%

Fire Resistance of In-Plane Compressed Log-House Timber Walls with Partial Thermal Insulation

Bedon

Fragiacomo

2018

Buildings

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This paper presents the full-scale experimental assessment of a log-house timber wall with partial thermal insulation under in-plane compression and exposed to fire on one side. A key aspect of the current design application for log-house systems is represented by geometrical details, like cross-sectional properties of logs (typically characterised by high depth-to-width ratios) and outriggers. The latter provides restraint condition for the examined walls and hence markedly affects their overall load-carrying capacity. As a result, careful consideration should be given to the choice of these details, compared to fully monolithic timber walls (i.e., made from cross-laminated timber), due to the possible occurrence of local structural and/or thermo-mechanical mechanisms. This is the case of exceptional loading conditions like fire load, as the fire resistance of these systems could be affected by a multitude of variables, including the presence (even though limited to few surfaces only) of thermal insulation panels. To this aim, the results of a full-scale furnace test are discussed in the paper for a log-wall with partial thermal insulation, namely thermal insulation applied on the outriggers only, under the effects of EN/ISO standard fire conditions. The results of Finite Element (FE) numerical studies are also reported, to further explore the load-carrying performance of the reference log-house specimen and compare it with the experimental observations. Several thermal insulation configurations are finally numerically investigated, showing their effects on the overall fire resistance of the assembly. In accordance with literature, the test shows that the log house's timber wall is suitable to obtain a fire resistance of about 60 min under relevant loading. The FE results are in rather close agreement with the temperature measurements within the section of logs, as well as a qualitative correlation with respect to the mechanical behaviour observed in the full-scale furnace experiment. The key role of outriggers and their thermo-mechanical boundaries, finally, is emphasised.

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Fire Resistance of Timber Panel Structures Under Standard Fire Exposure

Cited by 46 publications

References 11 publications

Structural response of cross-laminated timber compression elements exposed to fire

Structural response of cross-laminated timber compression elements exposed to fire

Special Issue on Operation Tomodachi—Fire Research

Fire Resistance of In-Plane Compressed Log-House Timber Walls with Partial Thermal Insulation

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