Saturday, July 30, 2011

New Zealand's Bridges: ANZAC Bridge across the Avon River in Christchurch (2)

March 2011 (-43.501 Degrees, 172.701 Degrees) ANZAC Bridge
The ANZAC Bridge has a 3-span voided slab superstructure on 4 column bents. It was built in 2000 and has a precast superstructure, precast bent caps, and precast columns. That makes it a very innovative design. However, the seismic design isn't easy to understand. It appears that the bridge was meant to survive the earthquake through brute strength. There are no dampers or plastic hinges designed to limit the seismic force. Moreover, the columns are too big to be damaged and so most of the damage was due to shear at the bent caps or at the column to bent cap connections. Bridges are supposed to be weaker in flexure than in shear to avoid catastrophic collapse in case the earthquake force is larger than expected. 

Creative Commons License
New Zealand's Bridges: ANZAC Bridge across the Avon River in Christchurch (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

1 comment:

istanbul tours said...

To find the grave of my grandfather at Hill 60 at Gallipoli was the object of a weekend visit from Istanbul.We had booked through a tour operator there but a few days from departure from Sydney,I contacted them top confirm they would take us to Hill 60 and they said they do not go to that part of the peninsular on their tours.I cancelled right away and, luckily,in that weekend's newspaper's travel section was a letter from a person who had booked with directly in Istanbul so I emailed them and was told http://www.privatetoursinistanbul.com they could take us to Hill 60 at no extra cost.A coffee break half way after 2 1/2 hours allowed us to stretch our legs. On the final part of the 5 hour journey,a tape was played outlining the history of the Dardenelles-Gallipoli campaign in 1915. Upon arrival at the Maydos waterside restaurant we were given lunch on the terrace wirth a wonderful view across the Dardenelles then we were off to the Brighton Beach site (one beach south of Anzac Cove and we were shown large maps of the area nd our guide explained the topography and battles shown on the map and the sites we would be visiting that afternoon.After the rather complete and highly interesting afternoon tour which included a visit to the local museum, we were taken back to restaurant and boarded a cruiser for the short crossing of the Dardenelles to Cannakale.. This in itself was a bonus as one could view the Gallipoli peninsular and grasp the view which eluded so many in rthe 1915 campaign when only a few Australian soldiers reached the peaks and saw the Dardenelles which we were now crossing,only to be beaten back by the Turks under the leadership of Attaturk later reforming President of Turkey.Included in the tour was a Sunday morning tour of Troy- that most elusive and explored city which Homer wrote about some 1200 years BC with Helen, the beauty being kidnapped by Paris and the resulting Trojan War which saw Troy VI destroyed only to be rebuilt at least 5 more times! There is a wooden horse there now but the original is said to have been a seige engine. driver and a guide to go north to Hill 60 to find my grandfather's grave. Through some wheat fields and onto a low knoll and here we were- the first persons to ever visit his grave, front row extreme right hand end.Only 44 graves, some 930 all buried in common grave, the action was made up of left-overs from various regiments,Aussies,New Zealanders ,British in this, the last main battle of the campaign.They were all wiped out in 2 days. An Australian flag, some gum leaves and a red poppy we left on the grave stone- it is a lonely place,sad and gut wrenching when one sees the absolute wastage in human lives-Back to Istanbul on the coach with memories and a feeling that we had, at least fulfilled one of life's ambitions!