Ductility of large-scale dowelled CLT connections under monotonic and cyclic loading (2017)
In the last decade, several tall timber buildings have been constructed in Europe, North America and Australasia. Often engineered wood products such as Cross Laminated Timber (CLT) are used in combination with strong connections to construct timber buildings exceeding 10 storeys. For tall timber buildings located in seismic areas it can be challenging to design strong yet ductile hold-downs in CLT shear walls. One common solution is to use dowelled connections with inserted steel plates. Design code calculation rules for timber connections are usually derived from smallscale testing assuming that strength and ductility properties can be extrapolated for larger connections in actual buildings. For CLT connections, fastener spacing requirements are derived in a similar manner under the general assumption that brittle failure modes can be prevented due to the reinforcing effect of cross-layers in CLT. In order to assess the validity of these assumptions, experiments were conducted on different layouts of small-scale and large-scale dowelled connections in CLT, Laminated Veneer Lumber (LVL) as well as a LVL-CLT hybrid, all made out of New Zealand Radiata pine. The tests comprised of 40 small and 12 large samples subjected to monotonic and cyclic loading. Strength and ductility were compared between the different connection sizes and layouts. For the large-scale connections, particle tracking velocimetry (PTV) was used for the first time to measure displacements.
Keywordsdowelled connections; ductility; LVL; CLT; PTV; seismic design; laminated veneer lumber; cross laminated timber; particle tracking velocimetry
ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
40 - Engineering::4005 - Civil engineering::400505 - Construction materials
40 - Engineering::4016 - Materials engineering::401610 - Timber, pulp and paper
40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
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Ottenhaus L-M; Li M; Smith T (2018)This paper presents an experimental study on 12 large-scale dowelled CLT connections under monotonic and cyclic loading. The connection design was inspired by hold-downs in tall CLT shear wall systems, however, the ...
Mode cross-over and ductility of dowelled LVL and CLT connections under monotonic and cyclic loading Ottenhaus L-M; Li M; Smith T; Quenneville P (2018)This paper presents an experimental study on dowelled connections in Cross Laminated Timber (CLT) and Laminated Veneer Lumber (LVL) using ϕ20 mm mild steel dowels and internal steel plates. Connections designed to fail ...
Li M; Ottenhaus L-M; Nokes R (2018)Particle Tracking Velocimetry (PTV) is a quantitative field measuring technique originally designed to track individual particles in fluid flows. In this study, PTV was applied for the first time in the context of large ...