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Research papers, The University of Auckland Library

During the Christchurch earthquake of February 2011, several midrise buildings of Reinforced Concrete Masonry (RCM) construction achieved performance levels in the range of life safety to near collapse levels. These buildings were subjected to seismic demands higher than the building code requirements of the time and higher than the current New Zealand Loadings Standard (NZS-1170.5:2004). Structural damage to these buildings has been documented and is currently being studied to establish lessons to be learned from their performance and how to incorporate these lessons into future RCM design and construction practices. This paper presents a case study of a six story RCM building deemed to have reached the near collapse performance level. The RCM walls on the 2nd floor failed due to toe crushing reducing the building’s lateral resistance in the east-west direction. A nonlinear dynamic analysis on a 3D model was conducted to simulate the development of the governing failure mechanism. Preliminary analysis results show that the damaged walls were initially under large compression forces from gravity loads which caused increase in their lateral strength and reduced their ductility. After toe crushing failure developed, axial instability of the model was prevented by a redistribution of gravity loads.

Images, UC QuakeStudies

The northern side of the Christ Church Cathedral with the cafe and store in the foreground. Shipping containers have been placed around the eastern side of the Cathedral to protect the road from falling debris. Wire fencing has also been placed around the building as a cordon. To the right, the damaged and party deconstructed tower can be seen with the missing spire which fell during the 22 February 2011 earthquake.

Images, UC QuakeStudies

Plant beds made out of corrugated iron, greening the empty building sites along Colombo Street. These were placed here by Greening the Rubble, a community project in Christchurch to create temporary public parks and gardens on the sites of demolished buildings.

Images, UC QuakeStudies

A photograph looking north down Manchester Street, taken from the intersection of Gloucester Street. In the distance, the road has been cordoned off. The Christchurch City Council car parking building can be seen on the right.

Images, UC QuakeStudies

A red double-decker tour bus sits outside the former Registry building of the Christchurch Arts Centre. A broken window has been boarded up and security fencing has been placed around the building. A sign pointing towards the Christchurch Art Gallery is attached to the fence.

Images, UC QuakeStudies

A photograph of the PricewaterhouseCoopers Building, the Copthorne Hotel, and the Forsyth Barr Building taken from the corner of Kilmore and Colombo Streets. In the background, a crane is hanging over the city.

Images, UC QuakeStudies

A photograph looking east down Armagh Street from the Provincial Chambers Buildings. In the distance, the Victoria Apartments, Forsyth Barr, and PricewaterhouseCoopers buildings can be seen, as well as two cordon fences and a crane.

Images, UC QuakeStudies

The University of Canterbury's E-Learning team's temporary office in the James Hight building. The photographer comments, "Yet another change of workplace for our E-Learning group, as the University juggles people and buildings to carry out earthquake repairs. My desk".