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Images, UC QuakeStudies

The entrance to 'Camp Hollywood', the American Civil Defence Force headquarters in Latimer Square. After the 22 February 2011 earthquake, emergency service agencies set up their headquarters in Latimer Square. The entrance way has a wooden sign reading, "Camp Hollywood" and a series of maps of Christchurch and New Zealand.

Images, UC QuakeStudies

A member of the Fire Service entering the Forsyth Barr building through a window in order to check for people trapped by the 22 February 2011 earthquake. A sign reading, "Help" has been stuck to one of the windows and a window above has already been broken by the team.

Images, UC QuakeStudies

A member of the Fire Service using an axe to break one of the Forsyth Barr building's windows in order to check for people trapped by the 22 February 2011 earthquake. A sign reading, "Help" has been stuck to one of the windows and a window above has already been broken by the team.

Images, UC QuakeStudies

A member of the Fire Service using an axe to break one of the Forsyth Barr building's windows in order to check for people trapped by the 22 February 2011 earthquake. A sign reading, "Help" has been stuck to one of the windows and a window above has already been broken by the team.

Images, UC QuakeStudies

A team of Fire Service and Search and Rescue personnel using a crane to check the Forsyth Barr building for people trapped by the 22 February 2011 earthquake. A sign reading, "Help" has been stuck to one of the windows and a window above has already been broken by the team.

Images, UC QuakeStudies

Deputy Administrator for Protection and National Preparedness at the Federal Emergency Management Agency, Tim Manning, and Michael Layne from the US Embassy in Wellington, speaking to Ray Kennedy, an Area Manager from the New Zealand Fire Service, in the Christchurch Art Gallery about the 22 February 2011 earthquake.

Images, UC QuakeStudies

A member of the New Zealand Fire Service in a cherry picker spraying water at the fire burning in the collapsed Canterbury Television Building. Smoke is billowing out of the intact section of the building. Below, emergency personnel are searching the rubble for trapped people. A piece of corrugated plastic is being used to slide pieces of debris off the site.

Images, UC QuakeStudies

Several vehicles on Gloucester Street which have been crushed by falling masonry from Wave House (Winnie Bagoes Gourmet Pizza Bar). Emergency personnel have spray painted two of the cars with the word "Clear" to indicate they have been checked for trapped or injured people. The scene has been cordoned off by New Zealand Fire Service tape.

Images, UC QuakeStudies

Damage to Wave House on Gloucester Street (Winnie Bagoes Pizza Bar). The roof and left side of the building have collapsed and crumbled into the street, crushing several cars. Emergency personnel have spray painted two of the cars with the word "Clear" to indicate they have been checked for trapped or injured people. The scene has been cordoned off by New Zealand Fire Service tape.

Research papers, The University of Auckland Library

New Zealand’s stock of unreinforced masonry (URM) bearing wall buildings was principally constructed between 1880 and 1935, using fired clay bricks and lime or cement mortar. These buildings are particularly vulnerable to horizontal loadings such as those induced by seismic accelerations, due to a lack of tensile force-resisting elements in their construction. The poor seismic performance of URM buildings was recently demonstrated in the 2011 Christchurch earthquake, where a large number of URM buildings suffered irreparable damage and resulted in a significant number of fatalities and casualties. One of the predominant failure modes that occurs in URM buildings is diagonal shear cracking of masonry piers. This diagonal cracking is caused by earthquake loading orientated parallel to the wall surface and typically generates an “X” shaped crack pattern due to the reversed cyclic nature of earthquake accelerations. Engineered Cementitious Composite (ECC) is a class of fiber reinforced cement composite that exhibits a strain-hardening characteristic when loaded in tension. The tensile characteristics of ECC make it an ideal material for seismic strengthening of clay brick unreinforced masonry walls. Testing was conducted on 25 clay brick URM wallettes to investigate the increase in shear strength for a range of ECC thicknesses applied to the masonry wallettes as externally bonded shotcrete reinforcement. The results indicated that there is a diminishing return between thickness of the applied ECC overlay and the shear strength increase obtained. It was also shown that, the effectiveness of the externally bonded reinforcement remained constant for one and two leaf wallettes, but decreased rapidly for wall thicknesses greater than two leafs. The average pseudo-ductility of the strengthened wallettes was equal to 220% of that of the as-built wallettes, demonstrating that ECC shotcrete is effective at enhancing both the in-plane strength and the pseudo-ductility of URM wallettes. AM - Accepted Manuscript