Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


UC Researching Seismic Design For Timber Buildings

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

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

New Record: Migrant Arrivals At 129,500 A Year

Annual net migration has been steadily increasing since 2012. "This was mainly due to the rising number of migrant arrivals to New Zealand," population statistics senior manager Peter Dolan said. "Fewer migrant departures also contributed to the increase in net migration." More>>

ALSO:

Launched: NASA's Super Pressure Balloon Takes Flight From NZ

NASA successfully launched its football-stadium-sized, heavy-lift super pressure balloon (SPB) from Wanaka, New Zealand, at10:50 a.m. Tuesday, April 25 (6:50 p.m. April 24 in U.S. Eastern Time), on a mission designed to run 100 or more days floating at 110,000 feet (33.5 km) about the globe in the southern hemisphere's mid-latitude band. More>>

ALSO:

Trade Agreements: TPP Minus US Starting To Gain Ground

The Japanese government is picking up the pace on reviving the Trans-Pacific Partnership trade and investment deal, with talks scheduled next month among the 11 countries left in the pact after the withdrawal by the US after the election of president Donald Trump. More>>

ALSO:

PACER:

Prices Up 2.2%: Annual Inflation Highest In Over Five Years

"Rising petrol prices along with the annual rise in cigarette and tobacco tax lifted inflation," prices senior manager Jason Attewell said. "Petrol prices in New Zealand are closely linked to global oil prices, and cigarettes and tobacco taxes rise in the March quarter each year". More>>

ALSO:

Undertaxed? NZ Income Tax Rate Second Lowest Among Developed Nations

New Zealand workers pay the second smallest portion of their income to the government among developed nations and less than half the average ratio of their Organisation for Economic Cooperation and Development peers. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news