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Bénichou, Noureddine; Sultan, Mohamed A.

doi:10.1023/a:1015414827695

Cited by 15 publications

(3 citation statements)

References 22 publications

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“…). The thermal properties of these materials are a function of humidity and temperature, however at normal ambient temperatures any change is negligible in comparison to the other roofing components[35,36].Table 2. Thermal resistance (R) and thermal conductivity (k) of materials used for both the green and bare roofs.…”

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confidence: 99%

Thermal behavior of green roofs under Nordic winter conditions

Collins

Kuoppamäki

Kotze

et al. 2017

Building and Environment

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To understand how green roofs affect building energy performance under cold climatic conditions, a proper thermal analysis of the roof and its components is required. To address this, we measured the thermal conductivity of each layer of experimental green roofs, as well as the equivalent thermal resistance of the complete green roof system during winter conditions in southern Finland. Green roofs were compared to bare roofs (without substrate, vegetation and other green roof layers) to assess the basic functioning and relative performance of the green roof system. Layer analysis at various intensities of frost penetration showed that the thermal conductivity of each layer decreased when penetrated by frost. In particular, thermal conductivity of the substrate and vegetation layers decreased from 0.41 Wm-1 K-1 and 0.34 Wm-1 K-1 prior to freezing, to 0.12 Wm-1 K-1 and 0.10 Wm-1 K-1 after freezing, respectively. This phenomenon is explained by a reduction in bridge-water connectivity during freezing and a volumetric water content that was below the critical threshold value. Overall, a frost depth that extended through the complete green roof yielded the greatest equivalent thermal resistance at a mean value of 2.01 m 2 WK-1. During times of snow cover, snow acted as an insulator and reduced the relative energy saving benefits achieved by green roofs. These results provide information for designing the substrate and vegetation layers of green roofs for optimal insulation.

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confidence: 99%

Thermal behavior of green roofs under Nordic winter conditions

Collins

Kuoppamäki

Kotze

et al. 2017

Building and Environment

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“…As per the International Construction Code (ICC), MTC buildings require the fire resistance of exterior walls, and the structural frame is 2 h and 1 h, respectively [36]. In the case of gypsum-protected lightweight wood-framed assemblies ranging from 30 to 120 min [37]. Timber has low thermal conductivity, with limited heat transference between internal and external buildings.…”

Section: Mass Timber Products and Building Systemsmentioning

confidence: 99%

Critical Challenges and Potential for Widespread Adoption of Mass Timber Construction in Australia—An Analysis of Industry Perceptions

Zaman

Chan

Jonescu³

et al. 2022

Buildings

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The construction industry is one of the largest producers of greenhouse gases, accounting for 38% of global carbon emissions. Recently, interest in mass timber construction has grown, due to its potential benefits in reducing environmental impact compared to traditional construction methods that use steel and concrete, and in promoting global sustainability and climate agendas, such as the Sustainable Development Goals (SDGs) and global net-zero emissions by 2050. Despite the slow adoption of mass timber construction (MTC) in Australia, some innovative and iconic projects and initiatives have been realised. The research intends to identify critical challenges and potential for broader adoption of MTC in Australia. The study reviewed selected MTC projects, followed by a perception survey and interviews of the relevant industry stakeholders in Australia to understand the key barriers and enablers for the widespread application of MTC in Australia. Significant challenges identified in the research include a lack of understanding of fire safety, regulations, performance, inherent application, and local manufacturers and suppliers, which are yet to be improved. In addition, it was found that prior experience built confidence in the application of MTC. Furthering widespread adoption of MTC technology in Australia beyond cost competitiveness requires the Australian construction industry to work towards developing suitable regulatory and insurance policies, financing, incentivising clients, and a skilled workforce. The study focuses on an investigation in the context of industry perceptions of MTC in Australia. Based on the analysis of the critical characteristics of MTC projects, and using the empirical data, the study identifies key challenges and opportunities in the widespread application of MTC in Australia.

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“…They are determined on the basis of fire models and the specific physical parameters defining the conditions in the fire compartment [12]. Parameters that influence a fire are the type of compartment, the compartment size and geometry as well as the amount of ventilation available [13]. These curves are therefore built on the principle of heat balance within a fire compartment [14].…”

Section: Parametric Firesmentioning

confidence: 99%

Performance of Timber-to-Steel Bolted Connections Exposed to Fire

Alam

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The use of wood as structural elements in buildings is very common in Canada. However, because wood is combustible, the National Building Code of Canada [1] restricts the use of wood to smaller buildings compared to noncombustible buildings. Wood to steel connections, composed of heavy timber, steel plates and bolts, are used to assemble wood components together. The fire performance of timber connections is complex due to the variety of connection types, geometries and fastener arrangements, as well as the properties of the materials under fire exposure.This study investigates the fire performance of timber-to-steel bolted connections under tension loading by conducting fire tests, developing finite element models, and creating simplified empirical calculation methods. Two types of timber-to-steel bolted connections considered in this study are wood-steel-wood (WSW) and steel-wood-steel (SWS).In the experimental testing of this research, a series of full-scale fire tests was conducted on these connections loaded in tension exposed to either the standard CAN/ULC-S101 [2] or a non-standard time-temperature fire curves. Results showed that the fire resistance of all WSW and SWS connections were less than 45 min, which is a minimum fire-resistance rating for Canadian code compliance. The results also showed that the WSW specimens I am grateful for Ba Lam-Thien for his support in helping set up all the tests for this research study. I would also like to thank my colleagues, Samuel Bright Amankwah Boadi and Matt Turco for your assistance in constructing and running the tests. Thank you all for your support during the testing.Thank you to my family, my wife's family, and my friends for your continuous support in good and bad times. Without you I wouldn't have been able to complete this study.

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Untitled

Cited by 15 publications

References 22 publications

Thermal behavior of green roofs under Nordic winter conditions

Thermal behavior of green roofs under Nordic winter conditions

Critical Challenges and Potential for Widespread Adoption of Mass Timber Construction in Australia—An Analysis of Industry Perceptions

Performance of Timber-to-Steel Bolted Connections Exposed to Fire

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