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

 


New UC bridge construction techniques will speed up repairs

New UC bridge construction techniques will speed up repairs

September 16, 2013

New bridge construction techniques tested by University of Canterbury (UC) experts could improve the performance of bridges during earthquakes while speeding up the construction and repair processes.

UC civil engineering students are testing new ways of building bridge piers using prefabricated concrete components rather than bridge components that are poured on site.

The construction method is known as Accelerated Bridge Construction and greatly speeds up the bridge construction process while offering other advantages such as better construction quality and safety.

Research supervisor Dr Alessandro Palermo says it is particularly important and useful when it comes to repairing and rebuilding bridge structures following a significant earthquake.

``A number of bridge structures throughout Christchurch, such as the Ferrymead and Colombo Street bridges, have been affected by traffic restrictions for over a year due to structural damage. With these new bridge construction technologies, these bridges could have been rebuilt in a matter of weeks rather than months. 

``Our recent testing has focused on innovative new connections between footing and column components. These connections limit and constrain damage to small regions of the bridge structure that acts as fuses while protecting the rest of the structure from damage.

``Following an earthquake, these fuse regions of the structure can be easily repaired meaning the bridge can be back in service a short time after the earthquake event.

``Post tensioned steel bars or tendons act as a kind of elastic band which spring the structure back to its original position, meaning the structure is not left on a lean following an earthquake. This is particularly important as it means the bridge is likely to be safe for use immediately after an earthquake event by rescue vehicles.’’

One type of connection that is being tested uses mechanical couplers in the fuse region of the structure.

Masters student Sam White says use of couplers allows for replacement of only the damaged components of the bridge with no need for deconstruction or repair of the non-damaged components outside of the fuse region. This speeds up repairs and can also offer significant savings.

A video of the testing and repair process for the coupled bar connection can be seen at: http://youtu.be/lcH1SGyCetQ.

Testing of the new connection types continues this week at UC’s Structures Extension Laboratory.

ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Strike: Lyttelton Port Workers Vote To Escalate Dispute

Members of the Rail and Maritime Transport Union (RMTU) at Lyttelton Port today voted to escalate their industrial action. Around 200 RMTU members have been operating an overtime ban since 17 December and today they endorsed a series of full withdrawals of labour at the port. More>>

ALSO:

Scoop Business: NZ Dollar Falls To 3-Year Low As Investors Favour Greenback

The New Zealand dollar fell to its lowest in more than three years as investors sold euro and bought US dollars, weakening other currencies against the greenback. More>>

ALSO:

Scoop Business: NZ Govt Operating Deficit Smaller Than Expected

The New Zealand’s government’s operating deficit was smaller than expected in the first five months of the financial year as a clampdown on expenditure managed to offset a shortfall in the tax-take from last month’s forecast. More>>

ALSO:

0.8 Percent Annually:
NZ Inflation Falls Below RBNZ's Target

New Zealand's annual pace of inflation slowed to below the Reserve Bank's target band in the final three months of the year, giving governor Graeme Wheeler more room to keep the benchmark interest rate lower for longer.More>>

ALSO:

NASA, NOAA: Find 2014 Warmest Year In Modern Record

Since 1880, Earth’s average surface temperature has warmed by about 1.4 degrees Fahrenheit (0.8 degrees Celsius), a trend that is largely driven by the increase in carbon dioxide and other human emissions into the planet’s atmosphere. The majority of that warming has occurred in the past three decades. More>>

ALSO:

Scoop Business: New Zealand’s Reserve Bank Named Central Bank Of The Year

The Reserve Bank of New Zealand’s efforts to stifle house price inflation by using new policy tools has seen the institution named Central Bank of the year by Central Banking Publications, a publisher specialising in global central banking practice. More>>

ALSO:

Get More From Scoop

 
 
Standards New Zealand

Standards New Zealand
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news