Fire structural performance of thermo-mechanically compressed spruce timber by means experiments and a three-step multi-reactions pyrolysis 3D-finite element modelling

Tran, Trung Hieu; Thi, Van Diem; Oudjene, Marc; Khelifa, M.; Girods, Pierre; Debal, Matthieu; Rogaume, Yann; Jannot, Yves

doi:10.1016/j.conbuildmat.2021.126100

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…(6) Mehra et al [84] investigated the influence of accelerated ageing under cyclic dry and moist climate conditions on the pull-out resistance of densified Scots pine and undensified European beech dowel-type fasteners, and showed that the shape-recovery of the densified dowels increased the pull-out strength and improved the long-term performance of the dowel-to-lamellae connection (Figure 13). (7) Tran et al [96,97] developed models to predict the thermomechanical behaviour during a fire resistance test of wood components assembled with THM-densified Norway spruce dowels and showed that the THM-densification of dowels leads to an increase in the thermal conductivity coefficient, the heat release rate, the thermal inertia while reducing charring rate and the mass loss compared to undensified wood. ( 8) Several studies have focused on optimising DLT performance by studying the influence of the mechanical properties of dowels and layers, the thickness of the assembled layers, the spacing of dowels (or the number of rows of dowels), the diameter of dowels through both experimental testing and finite element (FE) models, on the mechanical performance of the assembly [82,83,85,112,113].…”

Section: 14 311mentioning

confidence: 99%

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Han

Kutnar

Sandak

et al. 2023

Forests

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Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes.

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Section: 14 311mentioning

confidence: 99%

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Han

Kutnar

Sandak

et al. 2023

Forests

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“…Numerous articles have been published using finite element in the field of loading due to fire and its analysis, including those on thermo-mechanically compressed spruce timber [13], heat transfer through timber elements [14], timber columns [15,16], and a timber wall [17][18][19]. It has been observed that all of the aforementioned studies employed numerical models and artificial neural networks for finding solutions to complex situations.…”

Section: Introductionmentioning

confidence: 99%

Using Optimization Algorithms-Based ANN to Determine the Temperatures in Timber Exposed to Fire for a Long Duration

2022

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The article investigates the temperature prediction in rectangular timber cross-sections exposed to fire. Timber density, exposure time, and the point coordinates within the cross-section are treated as inputs to determine the temperatures. A total of 54,776 samples of wood cross-sections with a variety of characteristics were considered in this study. Of the sample data, 70% was dedicated to training the networks, while the remaining 30% was used for testing the networks. Feed-forward networks with various topologies were employed to examine the temperatures of timber exposed to fire for more than 1500 s. The weight of the artificial neural network was optimized using bat and genetic algorithms. The results conclude that both algorithms are efficient and accurate tools for determining the temperatures, with the bat algorithm being marginally superior in accuracy than the genetic algorithm.

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An Innovative Engineered Wood Product Made from Densified Wood with Enhanced Fire Performance – State-of-the-Art

Han,

Rojas-Alva,

Schwarzkopf

et al. 2024

Wood &Amp; Fire Safety 2024

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Fire structural performance of thermo-mechanically compressed spruce timber by means experiments and a three-step multi-reactions pyrolysis 3D-finite element modelling

Cited by 8 publications

References 32 publications

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Using Optimization Algorithms-Based ANN to Determine the Temperatures in Timber Exposed to Fire for a Long Duration

An Innovative Engineered Wood Product Made from Densified Wood with Enhanced Fire Performance – State-of-the-Art

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