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BeckerFraserPhotos December 2011 photograph 2471
Images, UC QuakeStudies
A photograph of a damaged wall captioned by BeckerFraserPhotos, "The earthquake-damaged wall of a property at 107A Courtenay Drive in Kaiapoi".
Canterbury Earthquake September 2010 - Photograph 26
Images, UC QuakeStudies
Damage to a house in Richmond. Part of a brick wall has slumped, leaving a large gap between the wall and a window frame. The photographer comments, "Sunroom window frame".
Photo by Jennifer Middendorf 234
Images, UC QuakeStudies
A wall exposed by the removal of a damaged building has been decorated by Gap Filler with a knitting-like pattern. The adjoining wall has been graffitied.
BeckerFraserPhotos June 2011 photograph 291
Images, UC QuakeStudies
Detail of damage to a building on Ferry Road. The side walls have partially collapsed, and part of the brick wall is bowing outwards in danger of further collapse.
Pseudo-static cyclic, snap back and shake table testing of PreWEC self-cen…
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.
BeckerFraserPhotos April 2011 photograph 098
Images, UC QuakeStudies
The Coffee House on Montreal Street with a damaged side wall. Plywood and weather proof paper has been placed over the wall to keep wind and rain out of the building.
BeckerFraserPhotos October 2010 photograph 023
Images, UC QuakeStudies
The east wall of St Luke's Church on Manchester Street. The top of the wall has broken away and is now covered with plastic to prevent weather damage inside the building.
BeckerFraserPhotos February 2012 photograph 0175
Images, UC QuakeStudies
A photograph of a flying pig painted on a concrete block in a retaining wall. The photograph is captioned by BeckerFraserPhotos, "Decorated retaining wall in Cunningham Terrace, Lyttelton".
BeckerFraserPhotos February 2012 photograph 0179
Images, UC QuakeStudies
A photograph of flying pigs painted on concrete blocks in a retaining wall. The photograph is captioned by BeckerFraserPhotos, "Decorated retaining wall in Cunningham Terrace, Lyttelton".
Paul and Sam Corliss's Street Art Photograph (2015:03:29 13:22:40)
Images, UC QuakeStudies
A photograph of street art. The artwork is on the wall surrounding Waltham Pool and faces towards Waltham Park.
WEMO ERT Set 1 - March 2011 - Photograph 07
Images, UC QuakeStudies
A photograph of the earthquake damage to a room inside a house in Christchurch. Large sections of the plaster have crumbled from the walls, revealing the brick wall underneath.
Photograph of Gap Filler project 20 (45)
Images, UC QuakeStudies
The half-completed "Knit Happens" mural on the exposed brick wall of a building. The mural has been designed to look like a knitted pattern.
BeckerFraserPhotos May 2011 photograph 0484
Images, UC QuakeStudies
Damage to a car parking building on Lichfield Street. Part of the concrete wall has crumbled, exposing steel reinforcing rods within, and damaging an artwork painted on the wall.
Umut Akguzel Photograph 163
Images, UC QuakeStudies
A photograph of a broken brick wall beside the Amuri Courts car park building on Armagh Street. USAR codes have been spray painted in yellow on the wall.
BeckerFraserPhotos March 2011 photograph 122
Images, UC QuakeStudies
Scaffolding on the side of the Windsor Hotel which has been bent by the collapse of the building's brick wall. The hotel's fire escape has buckled and become detached from the wall.
BeckerFraserPhotos February 2011 photograph 429
Images, UC QuakeStudies
A detail of damage to the interior wall of the Durham Street Methodist Church. Plaster and concrete have fallen away from the wall, baring the stone work.
Canterbury Earthquake September 2010 - Photograph 32
Images, UC QuakeStudies
Damage to a house in Richmond. Part of the brick wall is visibly out of alignment, leaving large gaps at the corner of the house. The photographer comments, "Dining room exterior wall".
BeckerFraserPhotos February 2012 photograph 0178
Images, UC QuakeStudies
A photograph of a blue moon painted on a concrete block in a retaining wall. The photograph is captioned by BeckerFraserPhotos, "Decorated retaining wall in Cunningham Terrace, Lyttelton".
Photograph by Neil Macbeth 636
Images, UC QuakeStudies
Bracing against the front wall of the Arts Centre on Worcester Boulevard, helping to keep the wall together. Wire fencing has also been placed around the building as a cordon.
BeckerFraserPhotos September 2010 photograph 137
Images, UC QuakeStudies
Detail of the side wall of St Mary & St Athanaslos church on Edgeware Road. The bricks at the top of the wall have crumbled, revealing the second layer of bricks inside.
BeckerFraserPhotos February 2011 photograph 475
Images, UC QuakeStudies
A view of the interior of the Durham Street Methodist Church hall. The floor has been coated with plaster from the walls and ceiling, and items of furniture have been stacked up around the walls.
BeckerFraserPhotos December 2011 photograph 2216
Images, UC QuakeStudies
A photograph of a Christmas message written on the wall of a house at Cannon Hill Crescent in Mt Pleasant. Paper Christmas decorations have been stuck on the window above the wall.
Photograph of Gap Filler project 13 (14)
Images, UC QuakeStudies
An artwork in the walls of the Gap Filler Headquarters office building in Sydenham. The wall is made out of perspex which reveals recycled materials underneath.
Photograph of Gap Filler project 13 (15)
Images, UC QuakeStudies
An artwork in the walls of the Gap Filler Headquarters office building in Sydenham. The wall is made out of perspex which reveals recycled materials underneath.
BeckerFraserPhotos September 2010 photograph 056
Images, UC QuakeStudies
Cracking in the plaster work of the side wall of a building in the central city. The bricks that make up the wall have shaken apart and are threatening to topple.
Bettina Evans's photograph 2
Images, UC QuakeStudies
A house on Canterbury Street in Lyttelton with a damaged outer wall. The bricks have fallen away to expose the insulation. Cracks can be seen running diagonally along the remaining wall. Fencing and tape have been placed around the building to warn people off.
BeckerFraserPhotos December 2011 photograph 2371
Images, UC QuakeStudies
A photograph of a damaged building on Norwich Quay in Lyttelton. A section of brickwork on the side wall has crumbled leaving the inside space exposed. Security fencing has been placed around the damaged wall.
Central City Tour, 4 April 2011 - Photograph 16
Images, UC QuakeStudies
A spray-painted message on a wall of Englefield Lodge reads "We will try to save this house." Wooden bracing supports the wall. The photographer comments, "A bike ride around the CBD. Englefield, Christchurch's oldest house in Fitzgerald Ave".
Assessment of the minimum vertical reinforcement limits for RC walls
Research papers, The University of Auckland Library
During the 2010/2011 Canterbury earthquakes, several reinforced concrete (RC) walls in multi-storey buildings formed a single crack in the plastic hinge region as opposed to distributed cracking. In several cases the crack width that was required to accommodate the inelastic displacement of the building resulted in fracture of the vertical reinforcing steel. This type of failure is characteristic of RC members with low reinforcement contents, where the area of reinforcing steel is insufficient to develop the tension force required to form secondary cracks in the surrounding concrete. The minimum vertical reinforcement in RC walls was increased in NZS 3101:2006 with the equation for the minimum vertical reinforcement in beams also adopted for walls, despite differences in reinforcement arrangement and loading. A series of moment-curvature analyses were conducted for an example RC wall based on the Gallery Apartments building in Christchurch. The analysis results indicated that even when the NZS 3101:2006 minimum vertical reinforcement limit was satisfied for a known concrete strength, the wall was still susceptible to sudden failure unless a significant axial load was applied. Additionally, current equations for minimum reinforcement based on a sectional analysis approach do not adequately address the issues related to crack control and distribution of inelastic deformations in ductile walls.
BeckerFraserPhotos February 2011 photograph 219
Images, UC QuakeStudies
A cracked concrete wall on Avonside Drive.