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Audio, Radio New Zealand

The chair of the inquiry in to the Earthquake Commission has grave concerns about the state of the housing stock in Christchurch due to EQC's failure to properly fix quake damage. It's just one of a raft of findings released by Dame Silvia Cartwright today, after a year and a half long inquiry that heard from hundreds of homeowners and key players. Conan Young has the story.

Images, eqnz.chch.2010

Another hole has appeared in the street where a building has been demolished. Selwyn Dealers next door sensibly moved all their stock away from the adjoining wall just in case.

Images, eqnz.chch.2010

Now empty and soon to be demolished - sadly for the family and all the customers. Fortunately all plant and stock saved and the search to go on for another suitable space

Other, National Library of New Zealand

Site of Christchurch-based handmade denim clothing company. Includes details of available stock, fitting guides, and photo gallery. Archive section of the site shows production models available prior to the Christchurch Earthquake.

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Chris Lin and his wife Caleen Xue at the door of their cool store safe where they slept for three weeks after the 4 September earthquake to guard what was left of their stock, while their teenage children rented a single room in a house up the road for their safety".

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Chris Lin and his wife Caleen Xue at the door of their cool store safe where they slept for three weeks after the 4 September earthquake to guard what was left of their stock, while their teenage children rented a single room in a house up the road for their safety".

Research papers, University of Canterbury Library

Christchurch and Canterbury suffered significant housing losses due to the earthquakes. Estimates from the Earthquake Commission (EQC) (2011) suggest that over 150,000 homes (around three quarters of Christchurch housing stock) sustained damage from the earthquakes. Some areas of Christchurch have been declared not suitable for rebuilding, affecting more than 7,500 residential properties.

Videos, UC QuakeStudies

A video about the 4 September 2010 earthquake, produced for the anniversary of the earthquake. The video includes footage of the earthquake damage to the Christchurch city centre, Darfield, Rolleston, and Hororata. It also includes footage of diggers clearing stock in the Canterbury Brewery on St Asaph Street, engineers checking buildings in town, and a fire on Worcester Street.

Research papers, The University of Auckland Library

The sequence of earthquakes that has affected Christchurch and Canterbury since September 2010 has caused damage to a great number of buildings of all construction types. Following post-event damage surveys performed between April 2011 and June 2011, an inventory of the stone masonry buildings in Christchurch and surrounding areas was carried out in order to assemble a database containing the characteristic features of the building stock, as a basis for studying the vulnerability factors that might have influenced the seismic performance of the stone masonry building stock during the Canterbury earthquake sequence. The damage suffered by unreinforced stone masonry buildings is reported and different types of observed failures are described using a specific survey procedure currently in use in Italy. The observed performance of seismic retrofit interventions applied to stone masonry buildings is also described, as an understanding of the seismic response of these interventions is of fundamental importance for assessing the utility of such strengthening techniques when applied to unreinforced stone masonry structures AM - Accepted Manuscript

Research papers, Lincoln University

"Prior to the devastating 2010-2011 Canterbury earthquakes, the city of Christchurch was already exhibiting signs of a housing affordability crisis. The causes and symptoms were similar to those being experienced in Auckland, but the substantial damage to the housing stock caused by the earthquakes added new dimensions and impetus to the problem. Large swathes of the most affordable housing stock in the east of the city were effectively destroyed by the earthquakes. In itself this would have pushed the mean house price upwards, but compounding problems exacerbated the situation. These include the price effects of reduced supply of both rented and owned housing and increased demand from both displaced residents and an influx of rebuild workers. The need for additional temporary housing while repairs were undertaken and the associated insurance pay-outs bidding up rents with improved rental returns leading to increased interest in property investment. Land supply constraints and consenting issues inhibiting the build of new housing and political infighting and uncertainty regarding the future of parts of the city leading to a flight of development activity to peripheral locations and adjoining local authorities. Concerns that the erosion of the city council rating base combined with inadequacy of insurance cover for infrastructure will lead to large rates increases, increased development costs and reduced amenities and services in future years. These and other issuers will be elaborated on in this paper with a view to exploring the way forward for affordable housing Christchurch City."

Research papers, University of Canterbury Library

Existing New Zealand (NZ) building stock contains a significant number of structures designed prior to 1995 with non-ductile reinforced concrete (RC) columns. Recent earthquakes and research show that columns with such details perform poorly when subjected to seismic demand, losing gravity load carrying capacity at drift levels lower than the expected one. Therefore, in order to have a better understanding of existing RC columns in NZ, the history of these elements is investigated in this paper. The evolution of RC column design guidelines in NZ standards since the 1970s is scrutinized. For this purpose, a number of RC columns from Christchurch buildings built prior to 1995 are assessed using the current code of practice.

Research papers, The University of Auckland Library

Between September 4, 2010 and December 23, 2011, a series of earthquakes struck the South Island of New Zealand including the city of Christchurch producing heavy damage. During the strongest shaking, the unreinforced masonry (URM) building stock in Christchurch was subjected to seismic loading equal to approximately 150-200% of code values. Post-earthquake reconnaissance suggested numerous failures of adhesive anchors used for retrofit connection of roof and floor diaphragms to masonry walls. A team of researchers from the Universities of Auckland (NZ) and Minnesota (USA) conducted a field investigation on the performance of new adhesive anchors installed in existing masonry walls. Variables included adhesive type, anchor diameter, embedment length, anchor inclination, and masonry quality. Buildings were selected that had been slated for demolition but which featured exterior walls that had not been damaged. A summary of the deformation response measured during the field tests are presented AM - Accepted Manuscript