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Images, UC QuakeStudies

Rubble in front of a two-storey house on Peterborough Street, the brick side wall of which has fallen away, exposing the rooms inside. Further rubble from a neighbouring house lies in the foreground.

Images, UC QuakeStudies

Detail of damage to a house in Richmond. The brick wall is badly cracked and twisted. The photographer comments, "These photos show our old house in River Rd and recovery work around Richmond and St Albans. More ruptured brickwork".

Images, UC QuakeStudies

A view down Colombo Street. A brick wall has been revealed due to the demolition of the adjoining building. A walkway from Gloucester Street to the Square was opened up for a few days to allow the public a closer look of the cathedral.

Images, UC QuakeStudies

A photograph of an empty building site on the corner of Lichfield Street and Madras Street. A mural commissioned by Gap Filler titled 'Knit Happens' has been painted on the brick wall in the corner of the remaining buildings.

Images, UC QuakeStudies

A poem written on Gap Filler and Poetica's "Instant Poetry" wall on Colombo Street. The poem reads, "Amidst the shards of glass and twisted steel, beside the fallen brick and scattered concrete, we began to understand that there is beauty in the broken. Strangers do not live here anymore". This poem was picked by the public as the favourite poem written on the wall. It was then painted permanently onto the mural.

Images, UC QuakeStudies

Bricks have fallen from the walls of the former Princess Cinema in New Brighton, exposing the interior. The photographer comments, "Back of the old Princess Cinema in New Brighton after the earthquake in Christchurch, New Zealand on 22 February. In this picture you can see inside the old cinema curtains. This building has now been knocked down as it was so dangerous".

Images, UC QuakeStudies

A photograph of the earthquake damage to the Iconic bar on the corner of Manchester and Gloucester Streets. Large sections of the outer walls have collapsed, the bricks and masonry spilling onto the footpath below, crushing several cars. USAR codes have been spray-painted near the door and a red sticker has been taped above. The red sticker indicates that the building is unsafe to enter.

Images, UC QuakeStudies

A photograph of the earthquake-damaged buildings and rubble on Colombo Street near the intersection of St Asaph Street. The walls of the top storey of the buildings to the left have crumbled, and bricks and other rubble have fallen onto the footpath and road below. Wire fencing and police tape have been placed across the street as a cordon.

Images, UC QuakeStudies

A photograph of the earthquake damage to the Carlton Hotel on the corner of Papanui Road and Bealey Avenue. The wall of the top storey of the building has crumbled, and bricks have fallen onto the footpath. Wire fencing, road cones, and cordon tape have been placed around the building as a cordon. Scaffolding and steel bracing can be seen against the front of the building.

Images, UC QuakeStudies

Detail of damage to a house in Richmond. A double-brick wall has collapsed, and a gap is visible between the house and its foundation. The photographer comments, "These photos show our old house in River Rd and recovery work around Richmond and St Albans. The house and the concrete patio are now 15cm apart. The house took half the dining room's remaining bricks with it as it jumped off the foundations. It gives a good visual indication of the displacement".

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

Images, UC QuakeStudies

A photograph of the earthquake damage to Quinns of Papanui Road. The front walls of the store have crumbled, exposing the rooms inside. Wire fencing and road cones have been placed around the building as a cordon.

Images, UC QuakeStudies

A photograph of a badly-damaged building on the corner of Manchester Street and Gloucester Street. The wall of the top storey has crumbled, and the bricks have fallen onto the footpath below. Wire fencing has been placed around the building as a cordon.