Skip header and navigation

4 records – page 1 of 1.

Capacity and Reliability of LVL Beams Manufactured from Juvenile Hardwood Plantation Logs

https://research.thinkwood.com/en/permalink/catalogue2023
Year of Publication
2018
Topic
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Author
Gilbert, Benoit
Bailleres, Henri
Zhang, Hao
McGavin, Robert
Organization
Griffith University
The University of Sydney
Year of Publication
2018
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Topic
Mechanical Properties
Keywords
Plantation
Hardwood
Bending Strength
Numerical Models
Capacity
Juvenile Wood
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
This paper summarises parts of the research outcomes of a university-government collaborative project aiming at determining the capacity and reliability of veneer-based structural products manufactured from early to midrotation (juvenile) hardwood plantations logs. Two species planted for solid timber end-products (Eucalyptus cloeziana and Corymbia citriodora) and one species traditionally grown for pulpwood (Eucalyptus globulus) were studied for the manufacture of the new products. Focus of this paper is on LVL beams. To cost-effectively determine the nominal design bending strengths of the new beams, a numerical model was developed. The model was found to accurately predict the strength of LVL beams with an average predicted to experimental ratio of 1.00 with a low coefficient of variation of 0.10. Using an established probabilistic database of the material properties of the veneered resources as model input, Monte-Carlo simulations were then performed. The design strength of the new LVL beams was established and found to be comparable to, and in some cases up to 2.5 times higher than, the ones of commercially available softwood products. Recommendations are also made in the paper on the appropriate capacity factors to be used for various service categories of structures. The proposed capacity factors were found to be 5% to 12% lower than the ones currently used in Australia for beams manufactured from mature softwood logs
Online Access
Free
Resource Link
Less detail

Hygrothermal Analysis of Timber-Based External Walls Across Different Australian Climate Zones

https://research.thinkwood.com/en/permalink/catalogue2071
Year of Publication
2018
Topic
Moisture
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Walls
Author
Gasparri, Eugenia
Brambilla, Arianna
Aitchison, Mathew
Organization
University of Sydney
Year of Publication
2018
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Walls
Topic
Moisture
Keywords
Hygrothermal Performance
Australia
Climate Zones
Mould
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
The aim of this work is to examine the hygrothermal performance of timber-based envelopes across Australia. The heat and moisture (HAM) analyses are performed with consideration of various climatic conditions for all major Australian cities including: Darwin (zone 1); Brisbane (zone 2); Sydney (zone 5); Melbourne (zone 6); and Canberra (zone 7). Two main typical wall sections are selected for investigation, a massive CLT wall type with an external insulation layer and a cavity-insulated timber frame wall. The transient hygrothermal behaviour and mould growth risk assessments are simulated with WUFI software. The study shows how emerging construction practices perform poorly with respect to HAM transfer, particularly in hot and humid climatic contexts during the cooling season.Critical configurations are identified and design alternatives suggested so to prevent material damage, guarantee durable wood structures and maintain indoor environment healthiness.
Online Access
Free
Resource Link
Less detail

Mass Timber Envelopes in Passivhaus Buildings: Designing for Moisture Safety in Hot and Humid Australian Climates

https://research.thinkwood.com/en/permalink/catalogue2840
Year of Publication
2021
Topic
Moisture
Energy Performance
Material
CLT (Cross-Laminated Timber)
Application
Building Envelope
Author
Strang, Marcus
Leardini, Paola
Brambilla, Arianna
Gasparri, Eugenia
Organization
University of Queensland
University of Sydney
Editor
Medved, Sergej
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Building Envelope
Topic
Moisture
Energy Performance
Keywords
Hygrothermal
Moisture Safety
Durability
Passive House
Envelope
Research Status
Complete
Series
Buildings
Summary
The uptake of buildings employing cross-laminated timber (CLT) assemblies and designed to Passivhaus standard has accelerated internationally over the past two decades due to several factors including responses to the climate crisis by decarbonising the building stock. Structural CLT technology and the Passivhaus certification both show measurable benefits in reducing energy consumption, while contributing to durability and indoor comfort. However, there is a general lack of evidence to support a fast uptake of these technologies in Australia. This paper responds to the compelling need of providing quantitative data and adoption strategies; it explores their combined application as a potential pathway for climate-appropriate design of energy-efficient and durable mass timber envelope solutions for subtropical and tropical Australian climates. Hygrothermal risk assessments of interstitial condensation and mould growth of CLT wall assemblies inform best-practice design of mass timber buildings in hot and humid climates. This research found that the durability of mass timber buildings located in hot and humid climates may benefit from implementing the Passivhaus standard to manage interior conditions. The findings also suggested that climate-specific design of the wall assembly is critical for mass timber buildings, in conjunction with excellent stormwater management practices during construction and corrosion protection for metallic fasteners.
Online Access
Free
Resource Link
Less detail

Mould Growth Models and Risk Assessment for Emerging Timber Envelopes in Australia: A Comparative Study

https://research.thinkwood.com/en/permalink/catalogue2898
Year of Publication
2021
Topic
Moisture
Material
CLT (Cross-Laminated Timber)
Application
Building Envelope
Author
Brambilla, Arianna
Gasparri, Eugenia
Organization
The University of Sydney
Editor
Medved, Sergej
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Building Envelope
Topic
Moisture
Keywords
Hygrothermal Performance
Condensation
Mould Growth Risk
WUFI
Mass Timber
Australian Climate
Research Status
Complete
Series
Buildings
Summary
Timber envelopes provide multiple benefits in reducing both operational and embodied energy environmental impacts in construction. However, when poorly designed, they may incur in high risk of mould growth, affecting both building performance and occupant’s wellbeing. This research investigates the risk of mould growth associated with emerging timber envelopes in Australia, particularly looking at mass-timber and timber-framed wall typologies. The study compares the use of two mould growth assessment models: the VTT and the IBP biohygrothermal. Results provide relevant insights on both current design approaches and performance assessment methodologies. Whilst the study is based on Australian practice, conclusions have international relevance and applicability.
Online Access
Free
Resource Link
Less detail