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Research papers, The University of Auckland Library

Unreinforced masonry (URM) is a construction type that was commonly adopted in New Zealand between the 1880s and 1930s. URM construction is evidently vulnerable to high magnitude earthquakes, with the most recent New Zealand example being the 22 February 2011 Mw6.3 Christchurch earthquake. This earthquake caused significant damage to a majority of URM buildings in the Canterbury area and resulted in 185 fatalities. Many URM buildings still exist in various parts of New Zealand today, and due to their likely poor seismic performance, earthquake assessment and retrofit of the remaining URM building stock is necessary as these buildings have significant architectural heritage and occupy a significant proportion of the nation’s building stock. A collaborative research programme between the University of Auckland and Reid Construction Systems was conducted to investigate an economical yet effective solution for retrofitting New Zealand’s existing URM building stock. This solution adopts the shotcrete technique using an Engineered Cementitious Composite (ECC), which is a polyvinyl alcohol fibre reinforced mortar that exhibits strain hardening characteristics. Collaborations have been formed with a number of consulting structural engineers throughout New Zealand to develop innovative and cost effective retrofit solutions for a number of buildings. Two such case studies are presented in this paper. http://www.concrete2013.com.au/technical-program/

Research papers, The University of Auckland Library

As a result of the 4 September 2010 Darfield earthquake and the more damaging 22 February 2011 Christchurch earthquake, considerable damage occurred to a significant number of buildings in Christchurch. The damage that occurred to the Christchurch Roman Catholic Cathedral of the Blessed Sacrament (commonly known as the Christchurch Basilica) as a result of the Canterbury earthquakes is reported, and the observed failure modes are identified. A previous strengthening intervention is outlined and the estimated capacity of the building is discussed. This strengthening was completed in 2004, and addressed the worst aspects of the building's seismic vulnerability. Urgent work was undertaken post-earthquake to secure parts of the building in order to limit damage and prevent collapse of unstable parts of the building. The approach taken for this securing is outlined, and the performance of the building and the previously installed earthquake strengthening intervention is evaluated.A key consideration throughout the project was the interaction between the structural securing requirements that were driven by the requirement to limit damage and mitigate hazards, and the heritage considerations. Lessons learnt from the strengthening that was carried out, the securing work undertaken, and the approach taken in making the building "safe" are discussed. Some conclusions are drawn with respect to the effectiveness of strengthening similar building types, and the approach taken to secure the building under active seismic conditions. AM - Accepted Manuscript

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 showing the Godley Head Lighthouse and cliffs. Taken from the entrance to Lyttelton Harbour looking north. The Godley Head Lighthouse (K4286) was discontinued on 6 July 2012. Volcanic banding is visible in the face of the cliffs. There were several major rock falls along the coastal ...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 showing the southern cliffs of Godley Head, taken from the middle of the shipping channel. Some earthquake damage to the cliffs is visible. There were several major rock falls along the coastal cliffs near Christchurch and Lyttelton Harbour. At Godley Head these caused damage to the ...

Images, Canterbury Museum

One landscape colour digital photograph taken on 27 May 2013 of London Street in Lyttelton. Taken from Sumner Road looking west across the intersection of London and Oxford Streets. The photograph shows several empty sections and the remaining buildings. The Lyttelton streetscape has changed dramatically from its pre-earthquake appearance and w...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 off Godley Head looking west towards the face of the cliffs. Rock which fell from the cliffs is heaped at the waters edge. Some of the buildings from the coastal defence battery are visible on top of the cliff. Volcanic banding is visible in the face of the cliffs. There were severa...

Images, Canterbury Museum

One landscape colour digital photograph taken on 27 May 2013 of a retaining wall in Sumner Road which was replaced due to earthquake damage. The original wall was created using red volcanic rock. Many walls like this were built using the Hard Labour Gang from the Lyttelton Gaol. The replacement wall has a small section of stone installed to sho...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 of London Street, Lyttelton. The photograph was taken from St Davids Street looking west. The roofs of the portable buildings forming the temporary Lyttelton Police station are visible in the foreground. The Lyttelton Port Company offices and Tunnel Portal are prominent in the midgrou...

Images, Canterbury Museum

One landscape colour digital photograph taken on 27 May 2013 of a retaining wall in Sumner Road which was replaced due to earthquake damage. The original wall was created using red volcanic rock. Many walls like this were built using the Hard Labour Gang from the Lyttelton Gaol. The replacement wall has a small section of stone installed to sho...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 on the corner of Norwich Quay and Canterbury Street, Lyttelton. The photograph shows the Mitre Hotel surrounded by temporary fencing. Three years after the 2010-2011 earthquakes there are still many uncertainties about which buildings can or will be retained. These buildings, or parts...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 on Winchester Street, Lyttelton. The photograph shows part of the rear windscreen of a blue car with a sticker which reads 'I don't need sex EQC is screwing me'. The right side of the sticker is torn leaving a jagged edge. The process of negotiation with EQC and insurance companies to...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 on the corner of Norwich Quay and Canterbury Street, Lyttelton. The photograph shows the sites of the Royal Hotel, Shadbolt House, and the Lyttelton Hotel along Norwich Quay. The Wunderbar and the repair and strengthening work underway on the Lyttelton Working Mens Club/The Loons are v...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 off Godley Head looking north to Boulder Bay and Taylors Mistake. Rock which fell from the cliffs is heaped at the waters edge. Volcanic banding is visible in the face of the cliffs. There were several major rock falls along the coastal cliffs near Christchurch and Lyttelton Harbour....

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 on Winchester Street, Lyttelton. The photograph is taken looking south from the site of the Catholic Church of St Joseph the Worker to the site of the Anglican Church of the Most Holy Trinity. Visible are the removed top of the bell tower and porch. The damaged vicarage is at the weste...

Images, Canterbury Museum

One landscape colour digital photograph taken on 26 May 2013 of Lyttelton Main School. The photograph is taken from St Davids Street looking northwest. One of the broader consequences of the 2010-2011 Canterbury earthquakes has been the Ministry of Education’s Shaping Education – Future Direction Review of Schools in the Greater Christchurch Ar...