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Audio, Radio New Zealand

Stonemason Mark Whyte puts sculpting commissions aside in order to respond to the Christchurch earthquakes and save classic street facades from the 1870s. Across the Red Zone and 3 generations of the Aires family- Bob, Rob and Suzie are at work on the Heritage Hotel which were the old government buildings.

Videos, UC QuakeStudies

A video of a tour of the inside of the Radio Network House on Worcester Street. Maurice Gibbens, demolition supervisor from CERES, and Craig Stracey, operations manger, explain how the building has been prepared for demolition by implosion.

Research papers, The University of Auckland Library

The 2010/2011 Canterbury earthquakes have provided a unique opportunity to investigate the seismic performance of both traditional and modern buildings constructed in New Zealand. It is critical that the observed performance is examined and compared against the expected levels of performance that are outlined by the Building Code and Design Standards. In particular, in recent years there has been a significant amount of research into the seismic behaviour of precast concrete floor systems and the robustness of the support connections as a building deforms during an earthquake. An investigation of precast concrete floor systems in Christchurch has been undertaken to assess both the performance of traditional and current design practice. The observed performance for each type of precast floor unit was collated from a number of post-earthquake recognisance activities and compared against the expected performance determined for previous experimental testing and analysis. Possible reasons for both the observed damage, and in some cases the lack of damage, were identified. This critical review of precast concrete floor systems will assist in determining the success of current design practice as well as identify any areas that require further research and/or changes to design standards.

Images, UC QuakeStudies

A photograph of the Canterbury Provincial Chambers on Durham Street. The building has been cordoned off with wire fencing and the roof covered by plastic sheeting. Much of the masonry has been removed and a wooden structure constructed inside. A crane can be seen behind.

Images, UC QuakeStudies

A photograph of the south side of the building at 112 Manchester Street. A contemporary billboard for Fortis Construction reads, "Let's build our new city together - kia kaha". It partly obscures an old painted sign for Polson's Decorators and Signwriters, which reads "Protect your investment. Paint your property regularly - and save money".

Images, UC QuakeStudies

A poem written on Gap Filler and Poetica's "Instant Poetry" wall on Colombo Street. The poem reads, "A city's more than buildings, and a city's more than steeples. A city's a population, family, friends and people. I will come back, to my English rose".

Images, UC QuakeStudies

A snapshot from GPS Boomerang's SmartBird flight over the Christchurch red zone on 23 December 2012, looking over Hereford Street with the Re:Start container mall visible in the bottom right, Oxford Terrace to the left. The buildings at the end of Cashel Street near Oxford Terrace have been demolished.

Images, UC QuakeStudies

A sign outside the Chinwag Eathai restaurant on Victoria Street reads "To all our valued customers. We are sorry to inform you as of Tuesday 17th January 2012 our building has been red stickered. Don't worry we will be back at a new location!! Yet to be confirmed".

Images, UC QuakeStudies

A sticker produced by SPCA Canterbury for residents to stick on their doors, indicating that there is an animal inside the property. This was produced after the 2010 and 2011 Canterbury earthquakes to help emergency personnel determine whether an animal is inside the building.

Research papers, University of Canterbury Library

Impact between structures of bridge sections can play a major, unexpected role in seismic structural damage. Linear and non-linear models are developed to analyze structural impact and response of two single-degree-of-freedom structures, representing adjacent buildings or bridge sections. The analyses presented assess probability of impact, displacement change due to impact, and the probability of increased displacement due to impact. These are assessed over a matrix of structural periods for each degree-of-freedom, different impact coefficients of restitution, and a probabilistically scaled suite of earthquake events. Linear versus non-linear effects are assessed using a Ramberg-Osgood non-linear model for column inelasticity. The normalized distance, or gap-ratio (GR), defined as a percentage of the summed spectral displacements, is used to create probabilistic design requirements. Increasing GR and structural periods that are similar (T2/T1~0.8-1.25) significantly decrease the likelihood of impact, and vice-versa. Including column inelasticity and decreasing coefficient of restitution decrease displacement increases due to impact and thus reduce potential damage. A minimum GR~0.5-0.9 ensures that any displacement increases will be less than 10% for 90% of ground motions over all structural period combinations (0.2-5.0sec). These results enable probabilistic design guidelines to manage undesirable effects of impact– an important factor during the recent Canterbury, New Zealand Earthquakes.

Research papers, University of Canterbury Library

A linear and non-linear model are developed to analyze the structural impact and response of two single degree of freedom structures, representing adjacent buildings or bridge sections. Different impact coefficients of restitution, normalized distances between structures and a range of different structural periods are considered. The probability of impact and the displacement changes that can result from these collisions are computed. The likelihood of an increase in displacement is quantified in a probabilistic sense. A full matrix of response simulations are performed to individually investigate and delineate the effects of inter-structure gap-ratio, period ratios, structural non-linearity and impact elasticity. Column inelasticity is incorporated through the use of a Ramberg-Osgood type hysteresis rule. The minimum normalized distance, or gap-ratio, required between two structures to ensure that the likelihood of increased displacement of more than 10% for either structure for 90% of the given earthquake ground motions is assessed as one of many possible design risk bounds. Increased gap ratio, defined as a percentage of spectral displacement, is shown to reduce the likelihood of impact, as well as close structural periods. Larger differences in the relative periods of the two structures were seen to significantly increase the likelihood of impact. Inclusion of column inelasticity and higher plasticity of impact reduce displacement increases from impact and thus possible further damage to the structures. Such information can be used as a guideline to manage undesirable effects of impact in design - a factor that has been observed to be very important during the recent Canterbury, New Zealand Earthquakes.

Images, UC QuakeStudies

A panoramic photograph taken at the front of Christ Church Cathedral. The front of the cathedral has steel bracing against it to limit further damage. The upper part of the front wall has crumbled completely, exposing the inside space. The Chalice sculpture is to the right and the BNZ building can be seen in the background.

Images, UC QuakeStudies

Photograph captioned by BeckerFraserPhotos, "The All Saints Church in Sumner. The traditional building materials and style of this church makes it look older than 1963. At the moment it is hidden behind a long line of containers protecting the road from potential rock fall hazards".

Images, UC QuakeStudies

A digitally manipulated image of a broken window on Spicer House. The photographer comments, "One of the office blocks in Christchurch City, New Zealand. As the window has not been fixed I am presuming that this building will be slowly demolished at a later date".

Images, UC QuakeStudies

Flowers blooming in a vacant site left by the demolition of a building at the corner of Worcester Street and Stanmore Road. A sign on the ground says 'Commemorative service here Wed 22nd Feb. Bring flowers, seedheads and symbols of memory and hope". In the background, on the wall it says 'Do not demo!'.

Images, UC QuakeStudies

A sign above the closed shutter of a building in Wainoni reads "Open 7 days". The photographer comments, "A Sunday afternoon ride to New Brighton, then back via Aranui, Wainoni, Dallington, and Richmond. Not a cheerful experience. Open 7 days. This Wainoni car parts shop was definitely not open today".