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Research papers, Victoria University of Wellington

In the late 1960s the Wellington City Council surveyed all the commercial buildings in the city and marked nearly 200 as earthquake prone. The owners were given 15 years to either strengthen or demolish their buildings. The end result was mass demolition throughout the seventies and eighties.¹ Prompted by the Christchurch earthquakes, once again the council has published a list of over 630 earthquake prone buildings that need to be strengthened or demolished by 2030.²Of these earthquake prone buildings, the majority were built between 1880 and 1930, with 125 buildings appearing on the Wellington City Council Heritage Building List.³ This list accounts for a significant proportion of character buildings in the city. There is a danger that the aesthetic integrity of our city will be further damaged due to the urgent need to strengthen these buildings. Many of the building owners are resistant because of the high cost. By adapting these buildings to house co-workspaces, we can gain more than just the retention of the building’s heritage. The seismic upgrade provides the opportunity for the office space to be redesigned to suit changes in the ways we work. Through a design-based research approach this thesis proposes a framework that clarifies the process of adapting Wellington’s earthquake prone heritage buildings to accommodate co-working. This framework deals with the key concepts of program, structure and heritage. The framework is tested on one of Wellington’s earthquake prone heritage buildings, the Wellington Working Men’s Club, in order to demonstrate what can be gained from this strengthening process. ¹ Reid, J., “Hometown Boomtown,” in NZ On Screen (Wellington, 1983). ² Wellington City Council, List of Earthquake Prone Buildings as at 06/03/2017. (Wellington: Absolutely Positively Wellington. 2017). ³ ibid. 

Research papers, The University of Auckland Library

Predictive modelling provides an efficient means to analyse the coastal environment and generate knowledge for long term urban planning. In this study, the numerical models SWAN and XBeach were incorporated into the ESRI ArcGIS interface by means of the BeachMMtool. This was applied to the Greater Christchurch coastal environment to simulate geomorphological evolution through hydrodynamic forcing. Simulations were performed using the recent sea level rise predictions by the Intergovernmental Panel on Climate Change (2013) to determine whether the statutory requirements outlined in the New Zealand Coastal Policy Statement 2010 are consistent with central, regional and district designations. Our results indicate that current land use zoning in Greater Christchurch is not consistent with these predictions. This is because coastal hazard risk has not been thoroughly quantified during the process of installing the Canterbury Earthquake Recovery Authority residential red zone. However, the Christchurch City Council’s flood management area does provide an extent to which managed coastal retreat is a real option. The results of this research suggest that progradation will continue to occur along the Christchurch foreshore due to the net sediment flux retaining an onshore direction and the current hydrodynamic activity not being strong enough to move sediment offshore. However, inundation during periods of storm surge poses a risk to human habitation on low lying areas around the Avon-Heathcote Estuary and the Brooklands lagoon.

Videos, UC QuakeStudies

A video of teachers and other staff at Christchurch schools receiving gratitude and flowers from members of the All Right? team. Ciaran Fox and some 'All Righties' (including Donovan Ryan and Jo Scott) arrive at Wainoni School and Shirley Intermediate School assemblies to launch their 'Winter Survival Kit' and share some love with a 'Little Burst of All Right'. The event was supported by BECA and the flowers were donated by Moffatts Flower Company. The Press took photographs and helped to distribute the video. All Right? posted a link to the video on their Facebook Timeline on 1 August 2014 at 4:00pm. They also published the video to YouTube on 20th November 2014.

Audio, Radio New Zealand

Hundreds of Christchurch homeowners have discovered extensive damage to the on-sold properties they purchased after the 2010/2011 earthquakes. Licenced Building Practictioner Dan Paltridge talks to Logan Church about what people need to look out for, and what they need to do before buying a home in the city.

Articles, UC QuakeStudies

A PDF copy of a page on the EQ Recovery Learning site which linked to a YouTube video. In 2015, Christchurch hosted the biggest international cricket tournament ever to be played in New Zealand - the ICC Cricket World Cup. Take a look behind the scenes and through the eyes of some of Canterbury's most passionate cricketers as cricket makes its epic return to the Hagley Oval.

Audio, Radio New Zealand

A review of the week's news including... National MP Todd Barclay falls on his sword while Labour is in damage control, the decision to not prosecute the Pike River Mine CEO is to be contested in the Supreme Court, the lawyer for Akshay Chand says she sought bail on his behalf believing his mother and aunt would monitor his every movement, The Education Ministry is forced to apologise for its flawed handling of school closures and mergers after the 2011 Canterbury earthquake, The Health Minister is forced to defend his embattled Ministry following a major budget blunder, employment lawyers aren't surprised another health sector group is taking a pay equity claim, Ministry for Primary Industries officials come under fire at a packed Stewart Island public meeting on the cull of the island's farmed oysters, it's Plan B for a crowd funded initiative that wants to take control of Dunedin's Cadbury factory and All Black great Sir Colin 'pinetree' Meads has been immortalised in bronze.

Audio, Radio New Zealand

A review of the week's news including... a two billion dollar pay equity settlement, the Government announces changes it says are aimed at improving the quality of immigrants and controlling the quantity, irresponsible, unsafe, and unethical -- that's how a new Netflix series aimed at teenagers is being described, the top family court judge fires back at criticisms levelled at the court system by a new women's advocacy group, the Prime Minister who oversaw the dramatic undermining of unions now says unions have probably become too small, a review of Mental Health Services finds they are under pressure, under resourced and not widely understood, the Air Force's NH90 helicopters have been all but grounded, an eight-year-old girl is pulled alive from Manukau Harbour after treading water for more than two hours, the conversion of thousands of hectares of the Mackenzie Basin to dairy farms has been halted, tampons and sanitary pads will not be subsidised for all women by Pharmac, the government department set up to make the economy bigger isn't sure it can reach the goals it set for itself, Central Christchurch residents say they're under siege from sex workers and are threatening legal action, the massive Kaikoura earthquake may have saved the town from having to spend millions of dollars and the largest multi-sport event in the world has arrived in Auckland.

Audio, Radio New Zealand

A review of the week's news including... New questions are raised by leaked video footage showing a robot and two workers inside the Pike River mine just months after the 2010 disaster, fresh happy faces in the newly announced Labour list line up, the country's two biggest media companies have been given a strong message from the regions after their proposed merger is knocked back, a full biosecurity operation launched in Kerikeri, Wellington house prices soar, a helicopter pilot describes his crash north of Wellington as 'frightening', women in the Mongrel Mob say there is now less violence towards women, a review of the Kaikoura earthquake reveals it generated a tsunami of nearly 7 metres, the most annoying driving habits on Christchurch roads and one half of a champion rowing crew is surprised by the other half's retirement announcement.

Audio, Radio New Zealand

A review of the week's news including... The bill to fix botched EQC repairs from the Canterbury earthquakes is now four times what the previous Government predicted just two years ago, immigrants are being computer profiled, MPs are told that medicinal cannabis should be legalised for more people, Middlemore Hospital's woes continue, the Government orders a compulsory recall of 50 thousand vehicles with faulty airbags, Auckland drivers face a double tax hike under proposed sweeping changes to transport funding, Parliament changes the law so New Zealand men with historical homosexual convictions can have them wiped, a bus company wants to recruit more than 100 drivers from overseas because it can't find enough people to do the job here, Dunedin has its biggest weekend ever in terms of money spent thanks to Ed Sheeran, first it was closing - now it's not, Kaikohe's Warehouse is to stay, it all comes together for the New Zealand cricket team against England, an international consortium reaches a verbal agreement to buy the New Zealand Warriors and the woman who was RNZ's Washington correspondent for more than 20 years has died.

Research papers, The University of Auckland Library

A review of the literature showed the lack of a truly effective damage avoidance solution for timber or hybrid timber moment resisting frames (MRFs). Full system damage avoidance selfcentring behaviour is difficult to achieve with existing systems due to damage to the floor slab caused by beam-elongation. A novel gravity rocking, self-centring beam-column joint with inherent and supplemental friction energy dissipation is proposed for low-medium rise buildings in all seismic zones where earthquake actions are greater than wind. Steel columns and timber beams are used in the hybrid MRF such that both the beam and column are continuous thus avoiding beam-elongation altogether. Corbels on the columns support the beams and generate resistance and self-centring through rocking under the influence of gravity. Supplemental friction sliders at the top of the beams resist sliding of the floor whilst dissipating energy as the floor lifts on the corbels and returns. 1:20 scale tests of 3-storey one-by-two bay building based on an earlier iteration of the proposed concept served as proof-of-concept and highlighted areas for improvement. A 1:5 scale 3-storey one-by-one bay building was subsequently designed. Sub-assembly tests of the beam-top asymmetric friction sliders demonstrated repeatable hysteresis. Quasi-static tests of the full building demonstrated a ‘flat bottomed’ flag-shaped hysteresis. Shake table tests to a suite of seven earthquakes scaled for Wellington with site soil type D to the serviceability limit state (SLS), ultimate limit state (ULS) and maximum credible event (MCE) intensity corresponding to an average return period of 25, 500 and 2500 years respectively were conducted. Additional earthquake records from the 22 February 2011 Christchurch earthquakes we included. A peak drift of 0.6%, 2.5% and 3.8% was reached for the worst SLS, ULS and MCE earthquake respectively whereas a peak drift of 4.5% was reached for the worst Christchurch record for tests in the plane of the MRF. Bi-directional tests were also conducted with the building oriented at 45 degrees on the shake table and the excitation factored by 1.41 to maintain the component in the direction of the MRF. Shear walls with friction slider hold-downs which reached similar drifts to the MRF were provided in the orthogonal direction. Similar peak drifts were reached by the MRF in the bi-directional tests, when the excitation was amplified as intended. The building self-centred with a maximum residual drift of 0.06% in the dynamic tests and demonstrated no significant damage. The member actions were magnified by up to 100% due to impact upon return of the floor after uplift when the peak drift reached 4.5%. Nonetheless, all of the members and connections remained essentially linearelastic. The shake table was able to produce a limited peak velocity of 0.275 m/s and this limited the severity of several of the ULS, MCE and Christchurch earthquakes, especially the near-field records with a large velocity pulse. The full earthquakes with uncapped velocity were simulated in a numerical model developed in SAP2000. The corbel supports were modelled with the friction isolator link element and the top sliders were modelled with a multi-linear plastic link element in parallel with a friction spring damper. The friction spring damper simulated the increase in resistance with increasing joint rotation and a near zero return stiffness, as exhibited by the 1:5 scale test building. A good match was achieved between the test quasi-static global force-displacement response and the numerical model, except a less flat unloading curve in the numerical model. The peak drift from the shake table tests also matched well. Simulations were also run for the full velocity earthquakes, including vertical ground acceleration and different floor imposed load scenarios. Excessive drift was predicted by the numerical model for the full velocity near-field earthquakes at the MCE intensity and a rubber stiffener for increasing the post joint-opening stiffness was found to limit the drift to 4.8%. Vertical ground acceleration had little effect on the global response. The system generates most of its lateral resistance from the floor weight, therefore increasing the floor imposed load increased the peak drift, but less than it would if the resistance of the system did not increase due to the additional floor load. A seismic design procedure was discussed under the framework of the existing direct displacement-based design method. An expression for calculating the area-based equivalent viscous damping (EVD) was derived and a conservative correction factor of 0.8 was suggested. A high EVD of up to about 15% can be achieved with the proposed system at high displacement ductility levels if the resistance of the top friction sliders is maximised without compromising reliable return of the floor after uplift. Uniform strength joints with an equal corbel length up the height of the building and similar inter-storey drifts result in minimal relative inter-floor uplift, except between the first floor and ground. Guidelines for detailing the joint for damage avoidance including bi-directional movement were also developed.

Research papers, Lincoln University

Predictive modelling provides an efficient means to analyse the coastal environment and generate knowledge for long term urban planning. In this study, the numerical models SWAN and XBeach were incorporated into the ESRI ArcGIS interface by means of the BeachMMtool. This was applied to the Greater Christchurch coastal environment to simulate geomorphological evolution through hydrodynamic forcing. Simulations were performed using the recent sea level rise predictions by the Intergovernmental Panel on Climate Change (2013) to determine whether the statutory requirements outlined in the New Zealand Coastal Policy Statement 2010 are consistent with central, regional and district designations. Our results indicate that current land use zoning in Greater Christchurch is not consistent with these predictions. This is because coastal hazard risk has not been thoroughly quantified during the process of installing the Canterbury Earthquake Recovery Authority residential red zone. However, the Christchurch City Council’s flood management area does provide an extent to which managed coastal retreat is a real option. The results of this research suggest that progradation will continue to occur along the Christchurch foreshore due to the net sediment flux retaining an onshore direction and the current hydrodynamic activity not being strong enough to move sediment offshore. However, inundation during periods of storm surge poses a risk to human habitation on low lying areas around the Avon-Heathcote Estuary and the Brooklands lagoon.

Research papers, Lincoln University

Prognostic modelling provides an efficient means to analyse the coastal environment and provide effective knowledge for long term urban planning. This paper outlines how the use of SWAN and Xbeach numerical models within the ESRI ArcGIS interface can simulate geomorphological evolution through hydrodynamic forcing for the Greater Christchurch coastal environment. This research followed the data integration techniques of Silva and Taborda (2012) and utilises their beach morphological modelling tool (BeachMM tool). The statutory requirements outlined in the New Zealand Coastal Policy Statement 2010 were examined to determine whether these requirements are currently being complied with when applying the recent sea level rise predictions by the Intergovernmental Panel on Climate Change (2013), and it would appear that it does not meet those requirements. This is because coastal hazard risk has not been thoroughly quantified by the installation of the Canterbury Earthquake Recovery Authority (CERA) residential red zone. However, the Christchurch City Council’s (CCC) flood management area does provide an extent to which managed coastal retreat is a real option. This research assessed the effectiveness of the prognostic models, forecasted a coastline for 100 years from now, and simulated the physical effects of extreme events such as storm surge given these future predictions. The results of this research suggest that progradation will continue to occur along the Christchurch foreshore due to the net sediment flux retaining an onshore direction and the current hydrodynamic activity not being strong enough to move sediment offshore. However, inundation during periods of storm surge poses a risk to human habitation on low lying areas around the Avon-Heathcote Estuary and the Brooklands lagoon similar to the CCC’s flood management area. There are complex interactions at the Waimakariri River mouth with very high rates of accretion and erosion within a small spatial scale due to the river discharge. There is domination of the marine environment over the river system determined by the lack of generation of a distinct river delta, and river channel has not formed within the intertidal zone clearly. The Avon-Heathcote ebb tidal delta aggrades on the innner fan and erodes on the outer fan due to wave domination. The BeachMM tool facilitates the role of spatial and temporal analysis effectively and the efficiency of that performance is determined by the computational operating system.

Articles, UC QuakeStudies

This study analysed liquefaction susceptibility and estimated ground settlements for two earthquake scenarios (foothills and Alpine Fault) for eastern Waimakariri District. The report was later partially superseded by Earthquake hazard assessment for Waimakariri District (Yetton and McCahon, 2009), which while not using such detailed analytical methods as the 2000 Beca report, reviewed new information available since 2000 (including that collected as part of the Pegasus Town development). This showed that the liquefaction susceptibility in eastern Waimakariri district was in fact much more variable than suggested in the 2000 Beca maps, and that liquefaction susceptibility was extremely difficult to predict without a site-specific investigation. See Object Overview for background and usage information.

Research papers, University of Canterbury Library

The abundance of cone penetration test (CPT) data from subsurface explorations in Christchurch and the surrounding areas provides a useful source of information for a characterization of the near surface shear wave velocity ( ) profile for the region. A portion of the investigations were conducted using seismic CPT, enabling the comparison of measured shear wave velocity with CPT data, and subsequently the evaluation of existing CPT- correlations for applicability to Canterbury-specific soils. The existing correlations are shown to be biased, generally over-predicting the observed with depth, thus demonstrating the need for a Canterbury-specific CPT- correlation.