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

 

What Winter? Temperature Records Set For June 20-22

The days around the winter soltice produced a number of notably warm tempertaures. More>>

Conservation Deal: New Kākāpō Recovery Partnership Welcomed

Conservation Minister Maggie Barry says the new kakapo recovery partnership between DOC and Meridian Energy is great news for efforts to save one of New Zealand’s most beloved birds. More>>

ALSO:

Tech Sector Report: Joyce Warns Asian Tech Investors View NZ As Hobbits And Food

Speaking in Wellington at the launch of a report showcasing the value of the technology sector to the New Zealand economy, Joyce said more had to be done to tell the country's technology stories overseas. More>>

ALSO:

Mediaglommeration: APN Gets OIO Approval For Demerger Plan

APN News & Media has received Overseas Investment Office approval for its plan to split out its NZME unit ahead of a potential merger with rival Fairfax Media's New Zealand operations. More>>

New Paper: Ninety-Day Trial Period Has No Impact On Firms' Hiring

The introduction of a 90-day trial period has had no impact on hiring by New Zealand companies although they are now in widespread use, according to researchers at Motu Economic and Public Policy Research. More>>

ALSO:

Corrections: Serco Exits Equity Stake, Remains As Operator

Serco has sold its equity stake in the company that holds the contract to design, build and run Wiri Prison in South Auckland but continues as sub-contractor to operate the facility. More>>

GDP: NZ Economy Grows Faster-Than-Forecast 0.7%

New Zealand's economy grew at a faster pace than expected in the first quarter of 2016 as construction expanded at the quickest rate in two years. The kiwi dollar jumped after the data was released. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news