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Images for walls; more images...

Images, Canterbury Museum

One landscape colour digital photograph taken on 28 April 2012 showing a painting of a winged pig flying against a cloud. The painting was executed on a large curved concrete block of a temporary retaining wall in Cunningham Terrace, Lyttelton. The retaining walls above and below Cunningham Terrace were severely damaged by the 22 February 2011 ...

Images, Canterbury Museum

One landscape colour digital photograph taken on 28 April 2012 showing a painting of a steam train with seven visible carriages or wagons. A caption painted below the train reads "The Gravy Train" The painting was executed in blue on large curved concrete blocks of a temporary retaining wall in Cunningham Terrace, Lyttelton. The retaining walls...

Images, Canterbury Museum

One landscape colour digital photograph taken on 28 April 2012 looking south from Cunningham Terrace, Lyttelton. The photograph shows a homemade sign with the text "How Happy are Those Whose Walls Already Rise. Virgil" . The sign is attached to a temporary safety fence on top of a retaining wall awaiting repair. Quoted author The retaining wall...

Research papers, The University of Auckland Library

The Christchurch earthquakes have highlighted the importance of low-damage structural systems for minimising the economic impacts caused by destructive earthquakes. Post-tensioned precast concrete walls have been shown to provide superior seismic resistance to conventional concrete construction by minimising structural damage and residual drifts through the use of a controlled rocking mechanism. The structural response of unbonded post-tensioned precast concrete wall systems, with and without additional energy dissipating elements, were investigated by means of pseudo-static cyclic, snap back and forced vibration testing with shake table testing to be completed. Two types of post-tensioned rocking wall system were investigated; a single unbonded post-tensioned precast concrete wall or Single Rocking Wall (SRW) and a system consisting of a Precast Wall with End Columns (PreWEC). The equivalent viscous damping (EVD) was evaluated using both the pseudo-static cyclic and snap back test data for all wall configurations. The PreWEC configurations showed an increase in EVD during the snap back tests in comparison to the cyclic test response. In contrast the SRW showed lower EVD during the snap back tests in comparison to the SRW cyclic test response. Despite residual drifts measured during the pseudo-static cyclic tests, negligible residual drift was measured following the snap back tests, highlighting the dynamic shake-down that occurs during the free vibration decay. Overall, the experimental tests provided definitive examples of the behaviour of posttensioned wall systems and validated their superior performance compared to reinforced concrete construction when subjected to large lateral drifts.

Images, UC QuakeStudies

A close up of the damaged stonework of Christ Church Cathedral. The upper part of the front wall has crumbled leaving the inside space exposed. Steel bracing has been placed against the wall to limit further damage.