Timber core-walls for lateral load resistance of multi-storey timber buildings

A. Dunbar, D. Moroder, S. Pampanin & A. Buchanan

This paper describes the results of experimental tests on post-tensioned Cross-Laminated Timber (CLT) corewalls
tested under bi-directional quasi-static seismic loading. The half-scale two-storey test specimens included
a stair with half-flight landings. The use of CLT panels for multi-storey timber buildings is gaining popularity throughout the world, especially for residential construction. Post-tensioned timber core-walls for lift-shafts (elevator shafts) or stairwells can be used as tubular structures for resistance to seismic loads and wind loads in open-plan commercial office buildings Previous experimental testing has been done on the in-plane behaviour of single and coupled timber walls at the University of Canterbury and elsewhere. However, there has been very little research done on the 3D behaviour of timber walls that are orthogonal to each other, and no research to date into single post-tensioned CLT walls or CLT tubular structures. This paper describes a “High Seismic option” consisting of full height post-tensioned CLT walls coupled with energy dissipating U-shaped Flexural Plates (UFPs) attached at the vertical joints between coupled wall panels and between wall panels and steel corner columns. An alternative “Low Seismic option” consists of posttensioned CLT panels connected by screws, to provide a semi-rigid connection, allowing relative movement between the panels, producing some level of frictional energy dissipation. The Low Seismic option is suitable for wind loading in non-(or low-) seismic regions.

TDJ 22-3

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