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BeckerFraserPhotos May 2012 photograph 048
Images, UC QuakeStudies
Photograph captioned by BeckerFraserPhotos, "A large pile of concrete rubble from a demolition site in Kilmore Street. Forsyth Barr building in the background".
OpShop's Jason Kerrison
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
Bic Runga
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
King Kapisi
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
Midnight Youth
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
Bic Runga
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
King Kapisi & Che Fu
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
Smiley Balloon
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
Dave Dobbyn
Images, eqnz.chch.2010
Band Together - Concert for Canterbury www.bandtogetherforcanterbury.co.nz 23rd October 2010 Free concrete in Hagley Park following the 4th September 2010 earthquake
Umut Akguzel Photograph 203
Images, UC QuakeStudies
A photograph of Umut Akguzel with a collection of concrete stairs salvaged from a building and placed in a car park in the Christchurch central city.
Photograph by Jocelyn Kinghorn 554
Images, UC QuakeStudies
High-rise buildings in the CBD seen over a concrete wall. From the left are the Hotel Grand Chancellor, the Westpac building and the Holiday Inn City Centre.
NicksPlace Photograph 191
Images, UC QuakeStudies
Large cracks between concrete slabs in a pathway beside the Southern Region Coastguard Waimakariri-Ashley boathouse on Charles Street in Kaiapoi show how the land has slumped towards the river.
The effects of axial restraint in reinforced concrete coupling beams
Research papers, The University of Auckland Library
Axial elongation of reinforced concrete (RC) plastic hinges has previously been observed in a range of laboratory experiments, and more recently was observed in several Christchurch buildings following the 2010/2011 Canterbury earthquakes. Axial restraint to plastic hinges is provided by adjacent structural components such as floors as the plastic hinges elongate, which can significantly alter the performance of the plastic hinge and potentially invalidate the capacity design strength hierarchy of the building. Coupling beams in coupled wall systems are particularly susceptible to axial restraint effects due to their importance in the strength hierarchy, the high ductility demands that they experience, and the large stiffness of bounding walls. From computational modelling it has been found that ignoring axial restraint effects when designing coupled walls can result in significantly increased strength, reduced ductility and reduced energy dissipation capacity. The complexity of the topic merits further research to better account for realistic restraint effects when designing coupled walls.
Effect of Loading Rate on Response of Reinforced Concrete Prisms
Research papers, University of Canterbury Library
Research following the 2010-2011 Canterbury earthquakes investigated the minimum vertical reinforcement required in RC walls to generate well distributed cracking in the plastic hinge region. However, the influence of the loading sequence and rate has not been fully addressed. The new minimum vertical reinforcement limits in NZS 3101:2006 (Amendment 3) include consideration of the material strengths under dynamic load rates, but these provisions have not been validated at a member or system level. A series of tests were conducted on RC prisms to investigate the effect of loading rate and sequence on the local behaviour of RC members. Fifteen axially loaded RC prisms with the designs representing the end region of RC walls were tested under various loading rates to cover the range of pseudo-static and earthquake loading scenarios. These tests will provide substantial data for understanding the local behaviour of RC members, including hysteretic load-deformation behaviour, crack patterns, failure mode, steel strain, strain rate and ductility. Recommendations will be made regarding the effect of loading rate and reinforcement content on the cracking behaviour and ductility of RC members.
Performance of thin precast concrete wall panels under dynamic loading.
Research papers, University of Canterbury Library
Slender precast concrete wall panels are currently in vogue for the construction of tall single storey warehouse type buildings. Often their height to thickness ratio exceed the present New Zealand design code (NZS 3101) limitations of 30:1. Their real performance under earthquake attack is unknown. Therefore, this study seeks to assess the dynamic performance of slender precast concrete wall panels with different base connection details. Three base connections (two fixed base and one rocking) from two wall specimens with height to thickness ratios of 60:1 were tested under dynamic loading. The two fixed based walls had longitudinal steel volumes of 1.27% to 0.54% and were tested on the University of Canterbury shaking table to investigate their proneness to out-of-plane buckling. Based on an EUler-type theoretical formula derived as part of the study, an explanation is made as to why walls with high in-plane capacity are more prone to buckling. The theory was validated against the present and past experimental evidence. The rocking base connection designed and built in accordance with a damage avoidance philosophy was tested on the shaking table in a similar fashion to the fixed base specimens. Results show that in contrast with their fixed base counterparts, rocking walls can indeed fulfil a damage-free design objective while also remaining stable under strong earthquake ground shaking.
New Zealand Defence Force photograph 283
Images, UC QuakeStudies
Damage to the Lyttelton Port. A concrete slab has separated from the pavement. A crack has opened up and bricks at the edge are falling in.
BeckerFraserPhotos October 2010 photograph 093
Images, UC QuakeStudies
The driveway of a house on Avonside Drive. One of the concrete slabs has broken apart from another and lifted to create a gap between them.
BeckerFraserPhotos October 2010 photograph 091
Images, UC QuakeStudies
The driveway of a house on Avonside Drive. One of the concrete slabs has broken apart from another and lifted to create a gap between them.
BeckerFraserPhotos February 2012 photograph 0172
Images, UC QuakeStudies
A photograph of a blind mouse painted on a concrete block in a retaining wall. The photograph is captioned by BeckerFraserPhotos, "Cunningham Terrace, Lyttelton".
BeckerFraserPhotos September 2010 photograph 041
Images, UC QuakeStudies
The Para Rubber Building on Manchester Street, its demolition nearly complete. A concrete post can be seen in this picture, the steel reinforcement visible out the sides.
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.
BeckerFraserPhotos June 2012 photograph 088
Images, UC QuakeStudies
Photograph captioned by BeckerFraserPhotos, "Remaining crushed concrete rubble on the site of the Hotel Grand Chancellor, Cashel Street. Te Waipounamu in the background (to be demolished)".
BeckerFraserPhotos February 2011 photograph 412
Images, UC QuakeStudies
A view down Avonside Drive showing cracks in the road from the 4 September 2010 earthquake. Concrete blocks have been placed next to power poles to provide support.
BeckerFraserPhotos February 2011 photograph 407
Images, UC QuakeStudies
A view down Avonside Drive showing cracks in the road from the 4 September 2010 earthquake. Concrete blocks have been placed next to power poles to provide support.
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".
BeckerFraserPhotos February 2011 photograph 413
Images, UC QuakeStudies
A view down Avonside Drive showing cracks in the road from the 4 September 2010 earthquake. Concrete blocks have been placed next to power poles to provide support.
BeckerFraserPhotos February 2011 photograph 408
Images, UC QuakeStudies
The driveway of a property on Avonside Drive. The slabs of concrete that make up the driveway have shifted and cracked, and weeds have grown up between them.
BeckerFraserPhotos September 2010 photograph 104
Images, UC QuakeStudies
Damaged pavement on the Williams Street bridge in Kaiapoi. The concrete abutment has risen during the earthquake, forcing its way through the pavement of the footpath into the open.
BeckerFraserPhotos September 2010 photograph 102
Images, UC QuakeStudies
Damaged pavement on the Williams Street bridge in Kaiapoi. The concrete abutment has risen during the earthquake, forcing its way through the pavement of the footpath into the open.
BeckerFraserPhotos June 2011 photograph 369
Images, UC QuakeStudies
Damage to a house in Redcliffs. The chimney is still intact, but is leaning away from the house at an extreme angle, and concrete blocks have fallen from the walls.