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Images for bracing; more images...

Images, UC QuakeStudies

A photograph of signs under the rear section of the Forsyth Barr building. The signs reads, "Danger drop zone". In the background is rubble from an earthquake-damaged building . Steel bracing has been constructed around a concrete pillar to the right.

Images, UC QuakeStudies

A photograph of the Durham Street Methodist Church. The parapet at the tip of the front gable has come loose and is leaning towards the road. Steel bracing has been placed behind the parapet to keep it from toppling.

Images, UC QuakeStudies

A photograph of the earthquake-damaged Our City O-Tautahi Building on the corner of Worcester Street and Oxford Terrace. Steel bracing has been placed against the building to secure the brick walls. The bracing is supported by large concrete blocks. Wire fences have also been placed around the bottom of the building as a cordon. Scaffolding has been erected around the tower to the right.

Images, UC QuakeStudies

A photograph of the Cranmer Courts on the corner of Kilmore and Montreal Streets. The gable to the left has crumbled, and there is damage to the tip of the gable in the foreground. Wooden bracing has been placed on both walls to limit further damage from aftershocks.

Images, UC QuakeStudies

A photograph of the earthquake-damaged Oxford Terrace Baptist Church. Steels bracing has been used to stabilise the front of the building. Crumbled masonry and other rubble is still lying in front. Wire fences have been placed around the building site as a cordon.

Images, UC QuakeStudies

A photograph of the earthquake-damaged Oxford Terrace Baptist Church. Steels bracing has been used to stabilise the front of the building. Crumbled masonry and other rubble is still lying in front. Wire fences have been placed around the building site as a cordon.

Research papers, University of Canterbury Library

Light timber framed (LTF) structures provide a cost-effective and structurally efficient solution for low-rise residential buildings. This paper studies seismic performance of single-storey LTF buildings sheathed by gypsum-plasterboards (GPBs) that are a typical lining product in New Zealand houses. Compared with wood-based structural panels, GPBs tend to be more susceptible to damage when they are used in bracing walls to resist earthquake loads. This study aims to provide insights on how the bracing wall irregularity allowed by the current New Zealand standard NZS 3604 and the in-plane rigidity of ceiling diaphragms affect the overall seismic performance of these GPB-braced LTF buildings. Nonlinear time-history analyses were conducted on a series of single-storey baseline buildings with different levels of bracing wall irregularities and ceiling diaphragm rigidity. The results showed significant torsional effect caused by the eccentric bracing wall layout with semi-rigid/rigid ceiling diaphragms. On average, bracing wall drift demand caused by the extreme bracing wall irregularities was three times of that in the regular bracing wall layout under the rigid diaphragm assumption. This finding agreed well with the house survey after the 2011 Canterbury Earthquake in which significantly more damage was observed in the houses with irregular bracing wall layouts and relatively rigid diaphragms. Therefore, it is recommended to limit the level of bracing wall eccentricity and ensure the sufficiently rigid diaphragms to avoid excessive damage in these LTF buildings in future events.

Images, UC QuakeStudies

A red-stickered building on Canterbury Street in Lyttelton. The building's facade has been propped up with timber, steel and concrete block bracing, and one of its windows has been weather proofed with plywood. Wire fencing has been place around the building as a cordon.