Comparative study on fire resistance and zero strength layer thickness of CLT floor under natural fire and standard fire

Xing, Zhiyan; Wang, Yuexiang; Zhang, Jin; Ma, Hao

doi:10.1016/j.conbuildmat.2021.124368

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…The exposed surface temperatures decay steadily but slowly due to the furnace enclosure and at 240 mins range from 120 o C to 350 o C (see Figure 6). Zeng et al [16] completed experiments on 3 and 5 ply CLT floors, exposing them to both standard and a simulated natural fire. In-depth CLT temperatures were recorded through the decay period for some of the experiments.…”

Section: Review Of Relevant Experimental Workmentioning

confidence: 99%

Accounting for Post-Peak Compartment Temperature Thermal Degradation of Mass Timber

Barber¹,

Christensen²,

Kotsovinos³

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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Mass timber load-bearing members need to be assessed for structural adequacy in fire. For high-rise buildings their strength has to be determined once the fire has completely decayed and the timber member is no longer impacted by the heat of the fire. For a decaying fire, the thermal penetration into a timber member continues well after the peak compartment temperature, resulting in timber strength degradation, which is not typically assessed and accounted for. From a review of experimental data sets for exposed mass timber members and using the glulam column data from the CodeRed large scale compartment experiments, an assessment of the issues for thermal penetration and heat diffusion has been carried out. Initial studies have shown that peak temperatures in a timber column will occur well after the end of flaming and that thermal loss from the member in the decay phase of the fire is slowed by the char layer built up. Assessment of structural adequacy of columns has shown that the reduced cross-section needs to account for the compartment post-peak temperature thermal penetration, or the engineering design may be non-conservative.

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Section: Review Of Relevant Experimental Workmentioning

confidence: 99%

Accounting for Post-Peak Compartment Temperature Thermal Degradation of Mass Timber

Barber¹,

Christensen²,

Kotsovinos³

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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“…Conversely, unprotected steel undergoes a rapid reduction in strength upon exposure to increased temperatures [25]. When examining homogeneous glulam beams (crafted from a single wood species), investigations into the thermal characteristics and properties influencing combustion can be approached similarly to solid wood analyses [26]. However, the combination of different wood species within a glulam assembly presents distinct challenges, primarily due to variations in the anatomical structure, physical properties, and differing thermal expansion exhibited by each wood species [27,28].…”

Section: Introductionmentioning

confidence: 99%

Burning Properties of Combined Glued Laminated Timber

Kytka,

Gašparík,

Novák

et al. 2024

Fire

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This study delved into the combustion properties of combined glulam bonded using polyurethane (PUR) and resorcinol-phenol-formaldehyde (RPF) adhesives. The experiment involved three distinct wood species, namely, spruce, alder, and beech, which were combined in homogeneous, non-homogeneous symmetrical, and non-homogeneous asymmetrical arrangements. These species were selected to represent a spectrum, namely, softwood (spruce), low-density hardwood (alder), and high-density hardwood (beech). The varying combinations of wood species illustrate potential compositions within structural elements, aiming to optimize mechanical bending resistance. Various parameters were measured during combustion, namely, the heat release rate (HRR), peak heat release rate (pHRR), mass loss rate (MLR), average rate of heat emission (ARHE), peak average rate of heat emission (MARHE), time to ignition (TTI), and effective heat of combustion (EHC). The findings indicate that incorporating beech wood into the composite glulam resulted in an increase in heat release, significantly altering the burning characteristics, which was particularly evident at the second peak. Conversely, the use of spruce wood exhibited the lowest heat release rate. Alder wood, when subjected to heat flux at the glued joint, displayed the highest heat emission, aligning with the results for EHC and MARHE. This observation suggests that wood species prone to early thermal decomposition emit more heat within a shorter duration. The time to ignition (TTI) was consistent, occurring between the first and second minute across all tested wood species and combinations. Notably, when subjected to heat flux, the glulam samples bonded with PUR adhesive experienced complete delamination of the initial two glued joints, whereas those bonded with RPF adhesive exhibited only partial delamination.

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“…Therefore, there is still room for a solution consisting of solid and completely pure wood, dovetail wood board elements (DWBEs) [23]. Numerous studies have been conducted in the literature on the technological, ecological, and economic aspects of EWPs in construction with different building solutions [24] such as [25][26][27][28][29][30], and there is limited understating of DWBEs, which mostly includes structural analysis of connection details (e.g., [31][32][33][34][35][36][37][38][39]). Here, the dovetail wood board elements (DWBEs) can be defined as solid/massive and pure wood structural elements such as floor Engineered Wood Products for Construction 4 slabs that use plug-in dovetail form in the joint detail and do not use adhesives and metal connections.…”

Section: Introductionmentioning

confidence: 99%

Various Geometric Configuration Proposals for Dovetail Wooden Horizontal Structural Members in Multistory Building Construction

Ilgın¹,

Karjalainen²,

Koponen³

2022

Engineered Wood Products for Construction

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Adhesives and metal fasteners have an important place in the content of engineered wood products (EWPs). However, adhesives may cause toxic gas emissions due to their petroleum-based nature, while metal fasteners may adversely affect the reusability of these products. These issues also raise important questions about the sustainability and environmental friendliness of EWPs. Thus, there is still room for a solution that is solid and completely pure wood, adhesive- and metal-connectors-free dovetail wood board elements (DWBEs). There are many studies on the technological, ecological, and economic aspects of these products in the literature, but no studies have been conducted to assess the technical performance of DWBEs. This chapter focuses on DWBEs by proposing various geometric configurations for horizontal structural members in multistory building construction through architectural modeling programs. In this architectural design phase, which is one of the first but most important stages, the proposed configurations are based on a theoretical approach, considering contemporary construction practices rather than structural analysis or mechanical simulation. Further research, including technical performance tests, will be undertaken after this critical phase. It is believed that this chapter will contribute to the dissemination of DWBEs for innovative architectural and structural applications, especially in multistory wooden structures construction.

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Comparative study on fire resistance and zero strength layer thickness of CLT floor under natural fire and standard fire

Cited by 15 publications

References 17 publications

Accounting for Post-Peak Compartment Temperature Thermal Degradation of Mass Timber

Accounting for Post-Peak Compartment Temperature Thermal Degradation of Mass Timber

Burning Properties of Combined Glued Laminated Timber

Various Geometric Configuration Proposals for Dovetail Wooden Horizontal Structural Members in Multistory Building Construction

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