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Research papers, University of Canterbury Library

To reduce seismic vulnerability and the economic impact of seismic structural damage, it is important to protect structures using supplemental energy dissipation devices. Several types of supplemental damping systems can limit loads transferred to structures and absorb significant response energy without sacrificial structural damage. Lead extrusion dampers are one type of supplemental energy dissipation devices. A smaller volumetric size with high force capacities, called high force to volume (HF2V) devices, have been employed in a large series of scaled and full-scaled experiments, as well as in three new structures in Christchurch and San Francisco. HF2V devices have previously been designed using very simple models with limited precision. They are then manufactured, and tested to ensure force capacities match design goals, potentially necessitating reassembly or redesign if there is large error. In particular, devices with a force capacity well above or below a design range can require more testing and redesign, leading to increased economic and time cost. Thus, there is a major need for a modelling methodology to accurately estimate the range of possible device force capacity values in the design phase – upper and lower bounds. Upper and lower bound force capacity estimates are developed from equations in the metal extrusion literature. These equations consider both friction and extrusion forces between the lead and the bulged shaft in HF2V devices. The equations for the lower and upper bounds are strictly functions of device design parameters ensuring easy use in the design phase. Two different sets of estimates are created, leading to estimates for the lower and upper bounds denoted FLB,1, FUB,1, FUB,2, respectively. The models are validated by comparing the bounds with experimental force capacity data from 15 experimental HF2V device tests. All lower bound estimates are below or almost equal to the experimental device forces, and all upper bound estimates are above. Per the derivation, the (FLB,1, FUB,1) pair provide narrower bounds. The (FLB,1, FUB,1) pair also had a mean lower bound gap of -34%, meaning the lower bound was 74% of device force on average, while the mean upper bound gap for FUB,1 was +23%. These are relatively tight bounds, within ~±2 SE of device manufacture, and can be used as a guide to ensure device forces are in range for the actual design use when manufactured. Therefore, they provide a useful design tool.

Audio, Radio New Zealand

DAVID SHEARER to the Prime Minister: Does he believe that Hon John Banks has behaved in a manner that “upholds, and is seen to uphold the highest ethical standards” as required by the Cabinet Manual? BARBARA STEWART to the Prime Minister: Did Mr Banks explain to the Prime Minister’s Chief of Staff that he would use “obfuscation” in his dealings with the media over the “anonymous” donations from Kim Dotcom? MAGGIE BARRY to the Minister of Finance: How does the Government intend to strengthen the Public Finance Act 1989 in the Budget this month? Hon DAVID PARKER to the Minister of Finance: In the most recent World Economic Outlook published by the IMF in April 2012, which of the 34 advanced economies listed is forecast to have a worse current account deficit (as a percentage of GDP) than New Zealand in 2013? METIRIA TUREI to the Prime Minister: Does he stand by all the answers he gave to Oral Question No 4 yesterday? KANWALJIT SINGH BAKSHI to the Minister for Economic Development: What action is the Government taking to improve co-ordination of the business growth agenda? Hon PHIL GOFF to the Minister of Foreign Affairs: What damage, if any, has been done to staff confidence and retention by the change proposals for his Ministry announced on 23 February 2012, and does he intend to announce on 10 May 2012 a reversal of many of the proposals? SIMON O'CONNOR to the Minister of Labour: What steps is the Government taking to improve workplace health and safety? GARETH HUGHES to the Minister of Conservation: Does her proposed extension of the Marine Mammal Sanctuary for Maui’s dolphins allow the use of set nets, drift nets, and trawl nets within the sanctuary? IAN McKELVIE to the Minister of Corrections: What reports has she received about trade training within prisons? Hon LIANNE DALZIEL to the Minister for Canterbury Earthquake Recovery: Has he required that all his Ministers involved in the Canterbury earthquake recovery read the briefing paper dated 10 May 2011 prepared by Chief Science Advisor, Professor Sir Peter Gluckman, into the psychosocial consequences of the Canterbury earthquakes; if not, why not? NIKKI KAYE to the Minister of Education: What evidence has she seen of excellent achievement in scholarship exams?  

Images, UC QuakeStudies

Large cracks run through the brick cladding of this house in Wainoni. The photographer comments, "During the numerous earthquakes in Christchurch the land which ran alongside the Avon river on Avonside Drive slumped towards the waterway. Houses which were wooden framed and had an external brick veneer started to sink into the liquefied soil. This caused the brick walls to crack, but the houses' occupants though shook up were saved by the wooden framework from the houses collapsing on them".

Videos, NZ On Screen

In this episode of the influential NZ architecture series, dapper tour guide David Mitchell looks at the 'Christchurch Style'. He begins with the humble baches on Taylor's Mistake's cliffs, before focusing on the Euro-influenced brutalism of Miles Warren and the "flamboyant" practice of Peter Beaven (earthquake victims SBS House, and Lyttelton Tunnel's "fifth ship" are featured); and the cottage's modern descendent: Don Donnithorne's post-war home. Warren intriguingly compares his process designing Christchurch Town Hall with Jørn Utzon's Sydney Opera House.

Audio, Radio New Zealand

TVs, shopping trolleys, beds, mattresses, even a gun. That is just some of the rubbish found by residents surrounding Christchurch's residential red zone. The area used to be filled with houses, but damage after the Canterbury earthquakes forced thousands of homes to be demolished. While many of the old suburban roads remain, the area now resembles a park. But it is now attracting those wanting to dump their rubbish for free - and Land Information NZ, which controls the land, has removed 25 tonnes of trash since January. Residents have had enough as well - with some taking matters into their own hands. Checkpoint reporter Logan Church has the story.

Audio, Radio New Zealand

Christchurch red zone residents say the area is experiencing an increasing amount of petty crime and dumped rubbish, due to a lack of people. The red zone was established after thousands of houses - and the land underneath them - suffered severe damage in the 2010 and 2011 earthquakes. Last year (2019), a Regeneration Plan for the area was signed off by the government - which included building walkways, cycleways, forests, wetlands, and sport and recreation areas. That's all designed to get people back into the red zone area - but much of the work is still years away. Logan Church met a resident who told him that in the meantime, things are deteriorating.

Audio, Radio New Zealand

The Reserve Bank has cut its benchmark interest rate, to support the economy against the impact of the Covid-19 virus. The central bank cut its official cash rate to 0.25 percent from one percent. Governor Adrian Orr says the cut is necessary to support businesses and employment. The last time the Reserve Bank made such a big cut was in March 2011 after the Canterbury earthquake. Last week, the bank outlined a range of unconventional monetary policy tools such as negative interest rates, special loans to banks, and buying bonds to put money into the economy. Cameron Bagrie is an independent economist. He speaks to Susie Ferguson.

Audio, Radio New Zealand

The Government's decision to only talk to iwi and hapu with interests in water which is used by Mighty River Power is supported by a member of the Iwi Chairs Forum; A constitutional Advisory Panel member, Professor Ranginui Walker, says many Maori are worried the Treaty could one day be forgotten; A Christchurch woman says she's still overwhelmed by the aroha and support shown, not only by Maori organisations, but also the general public, since the first earthquake hit Canterbury two years ago today; An Auckland hapu which has recently settled its Treaty claim with the Crown is planning to create new educational opportunities for young Maori.

Audio, Radio New Zealand

An Auckland community board wants Parliament to amend a Treaty Settlement Bill for Ngati Whatua o Orakei, to exclude a piece of land; Maori Wardens have fronted up to a researcher looking at how the Christchurch earthquake has affected emergency workers; Taranaki Maori are being called to a Treaty Update hui this weekend - to keep abreast of tribal claims against the Crown; The winner of the Golden Shears Open Women's Title for 2012 says she's keen to keep competing for a few more years yet and hopes she can inspire more wool handlers to get to her level and to prove that it is achievable.

Audio, Radio New Zealand

A review of the week's news including: Accusations in a new book that the defence force misled Ministers about what it's been doing in Afganistan, the EQC more than doubles it's estimate of how much it will pay out on Christchurch earthquakes claims, more than 800 military medals worth a quarter of a million dollars revealed stolen from the Waiouru National Army Museum, strong support for a proposed coal mine on the West Coast's Denniston plateau, will the Rugby World Cup deliver a hoped for economic boost as forcast, New Zealand shotput champion Valerie Adams wins her third straight World championship and the Penquin 'Happy Feet' heads south.

Audio, Radio New Zealand

One of five Maori social service providers losing a Family Start contract is choosing not to fight the decision in court - and will instead attempt to win back the business; Maori business leaders who've recently returned from China say the trip has already resulted in new export deals - including a five-tonne shipment of mussels to a Chinese town; A new Maori education group says iwi are sleeping giants that have woken up to help tamariki do better at school; A new study into the effects of the Canterbury earthquakes on Maori mental health patients is promising to offer a unique perspective on how Maori live after devastating events.

Audio, Radio New Zealand

Maori business leaders who've recently returned from China say the trip has already resulted in new export deals - including a five-tonne shipment of mussels to a Chinese town; One of five Maori social service providers losing a Family Start contract is choosing not to fight the decision in court - and will instead attempt to win back the business; A new Maori education group says iwi are sleeping giants that have woken up to help tamariki do better at school; A new study into the effects of the Canterbury earthquakes on Maori mental health patients is promising to offer a unique perspective on how Maori live after devastating events.

Audio, Radio New Zealand

Christchurch residents will gather today to mark the 10 year anniversary of the Christchurch Earthquake. Large crowds are expected from half past twelve this afternoon on the lawn just across the river from the memorial wall where a service begin at 12.30. Among those speaking is the prime minister, Jacinda Ardern. A message from former mayor, Sir Bob Parker, will be also read out. The names of the 185 who died will be read before a minute's silence at twelve fifty one, the exact moment the quake struck. Flowers will then be laid at the memorial wall. This is where our coverage began .A warning this is confronting audio of events that day.

Audio, Radio New Zealand

Many areas of Christchurch are underwater, dealing with what's been described as the worst flooding since the earthquakes. The high tide has just passed, with the rivers already running across roads and flooding into some homes. Schools have been closed, businesses inundated and dozens of roads around the city, closed. Already more than 70mm of rain has fallen in the past 24 hours, making it the city's wettest July on record. Now as the bad weather moves south the army has been put on standby in Dunedin for the expected deluge there. RNZ reporters Niva Chittock, Adam Burns and cameraman Nathan McKinnon are in Christchurch with the details.

Audio, Radio New Zealand

There's good news of sorts on the building-inspection front in Auckland. After nearly seven days of fanning out across the city inspecting damaged buildings - the biggest such deployment of building inspectors since the Christchurch earthquake emergency - the operation will be scaled back this weekend.  There are currently around 95 inspectors in the field who have checked 3,500 buildings. As of 6pm last night 190 buildings were red stickered, and a further 790 yellow stickered. The most red stickered areas are Mount Albert/Mt Eden with 54 and the North Shore with 32. Auckland Council general manager building consents Ian McCormick spoke to Corin Dann. 

Videos, UC QuakeStudies

A video of an interview with Tony Simpson, Principal of Phillipstown School, about the High Court's ruling on the merger of Woolston School and Phillipstown School. The Ministry of Education planned to merge the schools after the 22 February 2011 earthquake. However, Justice John Fogarty declared that the Ministry's consultation process failed to meet the requirements of the Education Act in two respects and that the merger was unlawful. Simpson talks about the joy he felt on hearing the news, his disappointment that it came down to a High Court decision, and his plans for the school's future.

Videos, UC QuakeStudies

A video of interviews with four enterprising young Christchurch residents recorded two years after the 22 February 2011 earthquake. The video includes interviews with Gap Filler Director Coralie Winn, Arts Centre Director Andrew Lovatt, artist Mike Hewson, and Student Volunteer Army leader Jason Pembleton. The interviewees are asked four questions: 'What do you think Christchurch city centre will look like in 10 years?', 'What do you most want to see in the new city?', 'What do you miss most about the old city?', and 'What keeps you in Christchurch?'.

Videos, UC QuakeStudies

A video showing part of the demolition of the Ozone Hotel in New Brighton. Steve Taylor comments "She put up a good fight. The Ozone in New Brighton was damaged in the February earthquake in Christchurch, New Zealand. Here is the main corner of the structure being, as they say, deconstructed. At the end there is a reverent bow by the excavator. Just before this the claw had caught on the floor/ceiling and the whole building shook from side to side, but it still stayed in place."

Images, UC QuakeStudies

A view down Beresford Street in New Brighton, looking west towards the city at sunset. The photographer comments, "On the other side of the Avon river from New Brighton is the Bexley red zone. Here numerous earthquake damaged streets of houses will be flattened due to it being to uneconomical in the current climate to repair the land to be suitable for housing. There is a campaign at the moment to try and convert all this red zone land, which is mainly adjacent to the Avon river to a giant park".

Images, UC QuakeStudies

Spray-painted writing on the side of a car parking building reads "0 cars". The photographer comments, "Strangely and appropriately this graffiti was on a car park. In fact the graffiti was 100% correct as the car park is in the Christchurch earthquake red zone and there should be zero cars now inside it. It may have been put on by an anti car protester or just an indication that the car park is empty. One of the suggestions for the City plan for the rebuilt Christchurch was for a pedestrian and cycle only area, which also fits in with 0 CARS".

Images, UC QuakeStudies

Digitally manipulated image of graffiti on a brick building on St Asaph Street. The graffiti depicts a sticking plaster over a broken section of the wall, with the words "I'll kiss it better". The photographer comments, "After the 22 February 2011 earthquake in Christchurch band aid plasters starting to appear in different parts of the city on damaged buildings. A year later most can still be seen. This one was once a whole plaster, but it has slowly broken up where it crossed the gap. The red bricks seen to symbolise the terrible wounds caused to the City and it's people".

Images, UC QuakeStudies

A residential street in New Brighton. Liquefaction still lines the street, and lampposts are leaning in different directions. The photographer comments, "This is the New Brighton red zone, which is parallel to the Avon River. The area suffered serious liquefaction during the numerous earthquakes/aftershocks and the land is being bought by the government. Although the houses do not look too bad in the background they have suffered badly. On the day I took this picture the council had just hours before cut the grass, which made the area look less abandoned".

Images, UC QuakeStudies

A digitally manipulated image of damaged Music Centre. The photographer comments, "The destruction caused by the demolition of the heritage buildings damaged in the Christchurch earthquakes looks similar to the scenes in London during the second world war. The building was the Catholic Cathedral College, Christchurch. It was an integrated Catholic co-educational secondary school. It was founded in 1987, but its origins go back more than a 100 years earlier. The college was an amalgamation of two schools: Sacred Heart College for girls, and Xavier College for boys".

Audio, Radio New Zealand

Our managed isolation hotels are too posh and returnees should not be treated like hotel guests with luxuries like free menu choices and drycleaning. That's the verdict from New Zealand woman Toni Foster who has returned to the country to take up a job and has spent the past 11 days in isolation at Ellerslie's Novotel Hotel. Toni says she had expected to return to isolation in accommodation similar to the container village after the Christchurch earthquakes - not a free four or five star hotel which she said some returnees were treating as a holiday. She says returnees should not be treated like hotel guests because they're not paying a cent to be there.

Audio, Radio New Zealand

Topics - scientists are wondering how the light gets out. Maybe there is a cosmic crack in everything, because in the Journal Astrophysical Letters it is noted that there is a huge deficit of light in the universe. Owners of heritage apartments in Auckland face becoming "impoverished" according to a high-profile real estate figure, because of new laws around earthquake strengthening. Martin Dunn of City Sales says the Building Amendment Bill is "overkill". He says those trying to sell heritage apartments are having a difficult time because of the new rules. Jim Anderton, has again raised the issue of whether the Christchurch Cathedral has to come down.

Audio, Radio New Zealand

Ravenscar House Museum holds an extraordinary, previously private art collection. The new building has been gifted to Christchurch by art collectors Susan Wakefield and her late husband Jim. The art remains in the ownership of the Ravenscar Trust.  Artists in the collection include Colin McCahon, Bill Sutton and Frances Hodgkins. The treasures were previously in the Wakefield's Christchurch home which suffered irreparable earthquake damage. They're now displayed in the purpose-designed and built Ravenscar House Museum in the city's Arts precinct. The story of the art and artefacts is told in in the book - Ravenscar House: A Biography, written by Christchurch journalist and writer Sally Blundell.  

Images, eqnz.chch.2010

Another city walk around, this time with my brother-in-law from Auckland. Also went to the Quake City exhibition in the city organised by the Canterbury Museum. First fine day for a while. This bus is used as a chocolate restaurant, and is parked next to the Pallet Pavilion on the site of the old Park Royal Hotel.