Use of particle tracking velocimetry in timber material and connection testing
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Particle tracking velocimetry (PTV) is a quantitative field measuring technique originally developed to track and measure the velocity of individual particles in fluid flows. In this study, PTV was applied for the first time in three different experimental studies in the field of structural timber engineering: (1) dowel embedment testing in cross laminated timber (CLT), (2) large-scale dowelled CLT connection testing, (3) material testing of small clear wood and laminated veneer lumber (LVL). The suitability of PTV was first assessed by comparing the PTV displacements to those obtained by potentiometers. Furthermore, the behaviour of the timber substrate was analysed with PTV in both embedment and large-scale connection tests. It was found that PTV was able to not only accurately measure dowel displacements, but also capture crack growth in the timber and compute the resulting displacement and strain fields in the dowel embedment area. Lastly, PTV was applied to small clear specimen testing to capture brittle fracture in shear, tension perpendicular to the grain, and in cleavage. This study demonstrated that PTV is able to provide reliable contact-free high-resolution measurements of displacement and strain fields on exposed timber surfaces and capture failure mechanisms such as brittle fractures and crack growth.
The research was jointly funded by the Natural Hazards Research Platform and EQC Post-graduate Research Grant in New Zealand. XLam NZ Ltd. is gratefully acknowledged for supplying the CLT.
- ASTM D143-09 (2009) Standard test methods for small clear specimens of timber. ASTM International, West ConshohockenGoogle Scholar
- ASTM D5764-97a (2013) Standard test method for evaluating dowel-bearing strength of wood and wood-based products. ASTM International, West ConshohockenGoogle Scholar
- Campagnol J, Radice A, Nokes R (2013) Lagrangian analysis of bed-load sediment motion: database contribution. J Hydraul Res 1686(November):37–41Google Scholar
- Murata K, Masuda M, Ukyo S (2005) Analysis of strain distribution of wood using digital image correlation method. Trans Vis Soc Jpn 25(9):57–63Google Scholar
- Nokes R (2018) “Streams 3.00: system theory and design”, University of Canterbury, 169. https://www.canterbury.ac.nz/engineering/schools/cnre/software/streams/
- Ottenhaus L-M, Li M, Smith T (2017) Ductility of large-scale dowelled CLT connections under monotonic and cyclic loading. In: Australian earthquake engineering society 2017 conference, Canberra, 24–26 Nov 2017Google Scholar
- Ottenhaus L, Li M, Nokes R (2018) Application of particle tracking in large scale timber connection Testing. In: Proceedings of WCTE 2018, Seoul, 20–23 August 2018Google Scholar
- Papastavrou P, Smith S, Wallwork T, Mcrobie A, Niem N (2016) Design of cross-laminated timber slabs with cut-back Glulam Rib Downstands. In: Proceedings of WCTE 2016, Vienna, 22–25 August 2016Google Scholar
- Samarasinghe S, Kulasiri D, Nicolle K (1997) Study of mode-I and mixed-mode fracture in wood using digital image correlation method engineering. Lincoln University, LincolnGoogle Scholar