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Newmarket Viaduct
The Newmarket Viaduct, sometimes considered 'one of the most distinctive engineering features' of New Zealand, is a seven-lane State highway viaduct in Auckland, the country's largest city. Carrying the Southern Motorway over the Newmarket suburb area southeast of the CBD of the city, the 700 m long viaduct is up to 20 m high in places. Due to concerns about its ability to withstand earthquakes and its increasing inability to cater for peaktime traffic demand, it is being replaced with a stronger and wider structure over several years, starting in 2009.
== Original structure ==
The viaduct was opened on 3 September 1966 at a cost of NZ$2.26 million, and was constructed as New Zealand's first pair of balanced cantilever bridges.〔 With its long spans, the s-curvature and the varying superelevation of the motorway, it is a complex structure even today, and at the time was ground-breaking design for New Zealand.〔''Engineering to 1990'' - IPENZ, Engineering Publications Co Ltd, Page 10〕
While considered a successful design, it was built to far lower earthquake standards than which other New Zealand structures now fulfill, being built to survive only a 1 in 500 year return period earthquake. It could have received significant damage in an earthquake as common as once in 200 years.〔''From Viaduct to Viaduct'' - ''e.nz magazine'', IPENZ, November/9 December, Page 42〕 This made the structure the weakest strategic transport infrastructure link in the Auckland area, with a potential collapse cutting off all motorway transport to the South.〔 Also, during design, temperature stresses were not yet understood to a sufficient degree, leading to increased wear on structural elements.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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