Some thresholds for grading British grown spruce to optimised strength classes using longitudinal resonance
Conference Proceeding
Ridley-Ellis, D., Adams, S., & Lehneke, S. (2018)
Some thresholds for grading British grown spruce to optimised strength classes using longitudinal resonance
The main commercial species in the UK and Ireland is Sitka spruce (Picea sitchensis), which is graded in combination with a small amount of Norway spruce (P. abies). It is typ...
Thinking beyond the usual strength grades – with examples of British spruce and larch
Conference Proceeding
Ridley-Ellis, D., Adams, S., & Lehneke, S. (2016)
Thinking beyond the usual strength grades – with examples of British spruce and larch. In Proceedings of the World Conference on Timber Engineering (WCTE 2016), August 22-25, 2016, Vienna, Austria, Eds.: J. Eberhardsteiner, W. Winter, A. Fadai, M. Pöll, Publisher: Vienna University of Technology
This paper summarises the processes and normative requirements involved in grading of structural timber, and outlines a number of areas in which matters may be improved, so as...
Using the right Modulus of Elasticity to get the best grades out of softwood timber species in Great Britain
Conference Proceeding
Gil-Moreno, D., Ridley-Ellis, D., & McLean, P. (2016)
Using the right Modulus of Elasticity to get the best grades out of softwood timber species in Great Britain. In WCTE 2016 World Conference on Timber Engineering e-book Full Papers
The correct characterisation of modulus of elasticity in bending is fundamental for timber grading, especially when that property limits the allocation to a strength class. Th...
Comparing usefulness of acoustic measurements on standing trees for segregation by timber stiffness.
Conference Proceeding
Gil-Moreno, D., & Ridley-Ellis, D. (2015)
Comparing usefulness of acoustic measurements on standing trees for segregation by timber stiffness. In R. J. Ross, R. Gonçalves, & X. Wang (Eds.), Proceedings: 19th International Nondestructive Testing and Evaluation of Wood Symposium (378-385
The paper presents a comparison of standard procedures to measure acoustic stiffness of standing trees and logs. The aim is to see how useful they are for predicting the prope...
The shear strength and failure modes of timber joists obtained from the torsion test method.
Conference Proceeding
Khokhar, A. M., Zhang, H., & Ridley-Ellis, D. (2010)
The shear strength and failure modes of timber joists obtained from the torsion test method. In A. Ceccotti (Ed.), 11th World Conference on Timber Engineering 2010 (WTCTE 2010) (3509-3516
This paper presents details of the experimental method and test results from a series of torsion tests undertaken to evaluate the shear strength of timber joists. The failure...
The use of acoustic-based NDT to predict the wood properties of UK-grown Sitka spruce at different stages in the wood supply chain.
Conference Proceeding
Moore, J., Lyon, A. J., Searles, G. J., & Ridley-Ellis, D. (2009)
The use of acoustic-based NDT to predict the wood properties of UK-grown Sitka spruce at different stages in the wood supply chain. In H. Zhang, & X. Wang (Eds.), Proceedings of the 16th International Nondestructive Testing and Evaluation of Wood Symposium, Beijing, China
This paper is concerned with the extent to which portable stress-wave-based instruments can be used to segregate Sitka spruce trees and logs; in particular the relationship be...
Random acts of elasticity: MoE, G and EN408.
Conference Proceeding
Ridley-Ellis, D., Moore, J. & Khokhar, A. M. (2009)
Random acts of elasticity: MoE, G and EN408
The paper examines the variation in modulus of elasticity (MoE) and shear modulus (G) within sawn timber and the implications for testing timber in accordance with EN408:2003....
Determining the Shear Modulus of Sitka Spruce from Torsion Tests
Conference Proceeding
Khokhar, A., Zhang, H., Ridley-Ellis, D. & Moore, J. (2008)
Determining the Shear Modulus of Sitka Spruce from Torsion Tests. In 10th World Conference on Timber Engineering 2008, 2137-2144. ISBN 9781615670888
This paper presents details of the experimental method, and preliminary results from, a series of torsion tests undertaken to evaluate the shear modulus of Sitka spruce (Picea...
Torsion tests on small and large-scale RHS with circular wall cut-outs
Conference Proceeding
Ridley-Ellis, D., Owen, J. S., & Davies, G. (2007)
Torsion tests on small and large-scale RHS with circular wall cut-outs
The results of small and large-scale torsion tests on rectangular section tubes with circular wall perforations are presented and discussed. Perforations are shown to cause th...
The performance of a new blind bolt for moment-resisting connections.
Conference Proceeding
Tizani, W., & Ridley-Ellis, D. (2003)
The performance of a new blind bolt for moment-resisting connections. In M. A. Jaurrieta, A. Alonso, & J. A. Chica (Eds.), Tubular Structures X: Proceedings of the 10th International Symposium, Madrid, Spain, 18-20 September 2003, 395-401
The paper introduces the principal findings of a testing programme carried out to assess the performance of a newly developed blind-bolt. The blind-bolt, an evolution of the L...