All Outputs (192)

A case study of timber demolition recycling in the UK
Presentation / Conference Contribution
Cramer, M., & Ridley-Ellis, D. (2020, December). A case study of timber demolition recycling in the UK. Presented at Northern European Network for Wood Science and Engineering – WSE2020, Online (Helsinki)

Test Machine Effect in the determination of modulus of elasticity for strength-graded timber
Presentation / Conference Contribution
Gil-Moreno, D., Ridley-Ellis, D., & Harte, A. M. (2021, August). Test Machine Effect in the determination of modulus of elasticity for strength-graded timber. Presented at WCTE 2021: World Conference on Timber Engineering, Santiago, Chile [Online]

This paper investigates if the relationship between the global and local moduli of elasticity (MoE), measured in bending tests, is affected by the test machines employed, and how that may influence strength grading. The ultimate aim is to study the p... Read More about Test Machine Effect in the determination of modulus of elasticity for strength-graded timber.

Perception and use of timber in construction: A case study of Ireland and the UK
Presentation / Conference Contribution
O'Ceallaigh, C., Gil-Moreno, D., Ridley-Ellis, D., & Harte, A. M. (2021, August). Perception and use of timber in construction: A case study of Ireland and the UK. Presented at WCTE 2021: World Conference on Timber Engineering, Santiago, Chile [Online]

A survey was carried out to examine the perception of timber in construction among industry stakeholders within northwest Europe. The survey received responses from 17 countries in total. The total results of all respondents are presented along with... Read More about Perception and use of timber in construction: A case study of Ireland and the UK.

Considerations for grading species combinations. General remarks on scenarios and requirements
Presentation / Conference Contribution
Ridley-Ellis, D., Gil-Moreno, D., & Harte, A. M. (2023, June). Considerations for grading species combinations. General remarks on scenarios and requirements. Presented at World Conference on Timber Engineering WCTE 2023: Timber for a Livable Future, Oslo, Norway

This paper discusses the situations in which timber species might be combined in commercial combinations, and the considerations relating to strength grading work. It is expected that more species combinations will be developed in the years to come,... Read More about Considerations for grading species combinations. General remarks on scenarios and requirements.

Considerations for grading species combinations. The example of Douglas fir with larch in Ireland and UK
Presentation / Conference Contribution
Gil-Moreno, D., Ridley-Ellis, D., & Harte, A. M. (2023, June). Considerations for grading species combinations. The example of Douglas fir with larch in Ireland and UK. Presented at World Conference on Timber Engineering WCTE 2023: Timber for a Livable Future, Oslo, Norway

This paper examines the grading of Douglas fir (Pseudotsuga menziesii) and larch (Larix spp.) as a strength grading species combination for the growth area formed by Ireland and the UK. The two genera produce higher timber quality than Sitka spruce (... Read More about Considerations for grading species combinations. The example of Douglas fir with larch in Ireland and UK.

Non-parametric lower confidence bounds for the fifth percentile - EN 14358 in comparison to a fully non-parametric approach
Presentation / Conference Contribution
Weidenhiller, A., Ridley-Ellis, D., & Neumüller, A. (2023, June). Non-parametric lower confidence bounds for the fifth percentile - EN 14358 in comparison to a fully non-parametric approach. Presented at World Conference on Timber Engineering WCTE 2023: Timber for a Livable Future, Oslo, Norway

In Europe, fifth percentile values are required for the calculation of characteristic values of strength and density. The European standard EN 14358:2016 defined three ways to calculate a 75% lower confidence bound (LCB) for such fifth percentile val... Read More about Non-parametric lower confidence bounds for the fifth percentile - EN 14358 in comparison to a fully non-parametric approach.

A little about the verification of a lot (EN 14358)
Presentation / Conference Contribution
Ridley-Ellis, D. (2022, September). A little about the verification of a lot (EN 14358). Paper presented at Northern European Network for Wood Science and Engineering (WSE) 2022, Goettingen, Germany

Sometimes it is necessary to estimate the mean and/or percentile of a certain population by limited sampling, in order to compare with target values. Done properly, the method should account for random chance in the sampling so that the two risks can... Read More about A little about the verification of a lot (EN 14358).

Can you guess the strength of timber? How (your) wood quality perceptions relate to reality
Presentation / Conference Contribution
Cramer, M., & Ridley-Ellis, D. (2022, September). Can you guess the strength of timber? How (your) wood quality perceptions relate to reality. Paper presented at Northern European Network for Wood Science and Engineering (WSE) 2022, Goettingen, Germany

UK-grown timber is often perceived to have “low quality”, and most of the UK’s sawn timber is used for fencing and packaging material. Much of the resource could be used as construction timber, as UK spruce and other softwoods can be strength graded... Read More about Can you guess the strength of timber? How (your) wood quality perceptions relate to reality.

The assessment of the mechanical and physical properties of in situ timber
Presentation / Conference Contribution
Bather, M., & Ridley-Ellis, D. (2022, September). The assessment of the mechanical and physical properties of in situ timber. Paper presented at Northern European Network for Wood Science and Engineering (WSE) 2022, Goettingen, Germany

The refurbishment of existing buildings is a more sustainable option than demolition and reconstruction, leading to significant reductions in CO2 emissions and many other benefits. Policy across Europe is leaning more towards retaining and upgrading... Read More about The assessment of the mechanical and physical properties of in situ timber.

Strength grading options for unusual resources
Presentation / Conference Contribution
Cramer, M., & Ridley-Ellis, D. (2023, October). Strength grading options for unusual resources. Paper presented at WSE: 19th Annual Meeting of the Northern European Network for Wood Science and Engineering, Oslo, Norway

Hardwoods in the United Kingdom Considerations When Looking to Future Planting and Future Value Chains
Presentation / Conference Contribution
Ridley-Ellis, D., & Cramer, M. (2024, September). Hardwoods in the United Kingdom Considerations When Looking to Future Planting and Future Value Chains. Presented at International Scientific Conference on Hardwood Processing, Coimbra, Portugal

Reasons for increasing the diversity of the tree species providing wood for the value chain include: improving forest resilience to climate change; mitigating the risks of pests and pathogens; and improving other important functions of forests such a... Read More about Hardwoods in the United Kingdom Considerations When Looking to Future Planting and Future Value Chains.

A proposed standardization framework for recovered timber strength grading
Presentation / Conference Contribution
Llana, D. F., Ridley-Ellis, D., Turk, G., & Íñiguez-González, G. (2024, June). A proposed standardization framework for recovered timber strength grading. Presented at III Congreso Ibero-Latinoamericano MAD de la Madera en la Construcción (CIMAD 24) : Libro de Actas de Resúmenes Extendidos, Madrid

An increasing quantity of wood is recovered from demolitions, presenting opportunities for enhanced value through reusing or recycling in structural uses. Prior to utilizing timber for structural applications, it is essential to subject it to a gradi... Read More about A proposed standardization framework for recovered timber strength grading.