Damage to the north side of ChristChurch Cathedral. The damaged windows have been boarded up and weeds can be seen growing in the lawn. A walkway from Gloucester Street to the Square was opened up for a few days to allow the public a closer look at the cathedral.
Photograph captioned by BeckerFraserPhotos, "The west wall of the Christ Church Cathedral where the rose window fell during the 23 December 2011 earthquake. Steel bracing has been used to hold up the front of the church".
Photograph captioned by BeckerFraserPhotos, "Menlo Terrace".
A photograph captioned by Paul Corliss, "Avonside and Retreat Roads post earthquake".
A photograph of a postal worker delivering mail on a street with damaged houses. The photograph is captioned by Paul Corliss, "Redcliffs and Sumner".
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.
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.
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".
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".
A photograph of street art. The artwork is on the wall surrounding Waltham Pool and faces towards Waltham Park.
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.
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.
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.
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.
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.
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.
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".
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".
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.
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.
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.
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.
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.
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.
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.
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.
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.
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".
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.
A cracked concrete wall on Avonside Drive.