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Images, UC QuakeStudies

Army presence outside the city cordon on Tuam Street. Road cones and cordon fencing have been placed around damaged buildings. In the background is a building where the walls have crumbled, exposing the interior of the building.

Images, UC QuakeStudies

Buildings seen through the cordon fence from Cathedral Square. From left to right are MFL House, the Forsyth Barr building, the PriceWaterhouseCoopers building, the Camelot Hotel and the Cathedral Square Police Station.

Images, UC QuakeStudies

A damaged building on Cashel Street near Oxford Terrace. The top of the facade has fallen off the building into the street below, taking the awning with it. Bricks from the building still lie on the footpath where they fell. Above, the windows have been braced with plywood. Wire fencing has been placed around the building as a cordon.

Images, UC QuakeStudies

Photograph captioned by BeckerFraserPhotos, "The Forsyth Barr building and PricewaterhouseCoopers building. It was recently announced that PricewaterhouseCoopers will be demolished as it is uneconomic to restore, and we understand Forsyth Barr is still under discussion".

Images, UC QuakeStudies

Photograph captioned by BeckerFraserPhotos, "People at the cordon on the corner of Durham and St Asaph Street, soldiers watching by. In the background is the Environment Court building at 83 Armagh Street, formerly the Canterbury Society of Arts. This building was added to the CERA demolitions list on 5 March 2012".

Research papers, University of Canterbury Library

The 4th of September 2010 Mw 7.1 Darfield (Canterbury) earthquake had generated significant ground shaking within the Christchurch Central Business District (CBD). Despite the apparently significant shaking, the observed structural damage for pre-1970s reinforced concrete (RC) buildings was indeed limited and lower than what was expected for such typology of buildings. This paper explores analytically and qualitatively the different aspects of the "apparent‟ good seismic performance of the pre-1970s RC buildings in the Christchurch CBD, following the earthquake reconnaissance survey by the authors. Damage and building parameters survey result, based on a previously established inventory of building stock of these non-ductile RC buildings, is briefly reported. From an inventory of 75 buildings, one building was selected as a numerical case-study to correlate the observed damage with the non-linear analyses. The result shows that the pre-1970s RC frame buildings performed as expected given the intensity of the ground motion shaking during the Canterbury earthquake. Given the brittle nature of this type of structure, it was demonstrated that more significant structural damage and higher probability of collapse could occur when the buildings were subjected to alternative input signals with different frequency content and duration characteristics and still compatible to the seismicity hazard for Christchurch CBD.