UC Researching Seismic Design For Multi-storey Timber Buildings
June 24, 2013
A University of Canterbury (UC) research team is investigating a new type of design for multi-storey timber buildings to
successfully withstand earthquakes.
UC researcher Andrew Dunbar says they are testing a combination of a low damage structural system with cross laminated
timber.
``This is the first time in the world that anyone has done this. Cross laminated timber (CLT) panels are a new product
to New Zealand, which started up at a Nelson factory last year,’’ Dunbar says.
``The panels are made like plywood with boards laid out in alternating directions. The difference is that CLT uses whole
timber planks rather than thin veneers. Panels can be made from cheap low grade material to produce a quality structural
material.
``In New Zealand and overseas multi-storey timber structures are becoming increasingly desirable for architects and
building owners due to their aesthetic and environmental benefits.
``There is increasing public pressure to have low damage structural systems with minimal business interruption after a
moderate to severe seismic event.
``The aim of our research is to combine a low damage structural system with CLT. We are being supervised by Professor
Andy Buchanan and Associate Professor Stefano Pampanin.
``We are also using post-tensioned high strength steel tendons that clamp the CLT walls to the foundation. During an
earthquake, the walls are allowed to rock and the high strength steel tendons act like rubber bands and snap the
building back to its original position.
``This is the same concept that has been applied to the new Christchurch timber buildings in Victoria St, Birmingham
Drive and the concrete Southern Cross Hospital Endoscopy building which was built before the earthquakes.’’
Dunbar says two test specimens are the feature of their research a low seismic option and a high seismic option. The low
seismic option is aimed at the Auckland and Australian markets, replacing concrete tilt panels and shear cores.
The high seismic option is aimed for the Christchurch and Wellington areas providing a low damage system with
replaceable energy dissipaters that act as ductile fuses.
The timber panels are much lighter than concrete providing smaller foundations meaning less expense.
``Our cross design system gives connections a much higher capacity than traditional timber using nails or bolts. This
can be achieved at a comparable cost to concrete or steel while providing the added environmental and aesthetic
benefits,’’ Dunbar says.
Final results of his research at UC’s Civil engineering and Natural Resources laboratory will be known at the end of the
year. UC was recently ranked the 21st university in the world in terms of civil engineering and natural resources.
ENDS