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Images for Demolition OR deconstruction OR repair OR rebuild; more images...

Images, eqnz.chch.2010

House being re-built on the corner of Hercules Street and Quinns Road, Shirley, Christchurch. File reference: CCL-2012-05-10-Around-Shirley-May-2012 DSC_02847.JPG From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

House being re-built on the corner of Hercules Street and Quinns Road, Shirley, Christchurch. File reference: CCL-2012-05-10-Around-Shirley-May-2012 DSC_02848.JPG From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

Tuesday 27 March 2012. File reference: CCL-2012-03-27-IMG_0725 From the collection of Christchurch City Libraries.

Videos, UC QuakeStudies

A video clip by Anglican Advocacy (previously Anglican Social Justice Unit) for Social Services Sunday 2011 (Sunday 24 July). "The success of disaster recovery is whether the vulnerable are better or worse off as a result."

Articles, UC QuakeStudies

An example of the five year rebuild schedule map created as part of the prioritisation process detailing where and when construction would start. The data behind this map was updated every quarter.

Research papers, The University of Auckland Library

High demolition rates were observed in New Zealand after the 2010-2011 Canterbury Earthquake Sequence despite the success of modern seismic design standards to achieve required performance objectives such as life safety and collapse prevention. Approximately 60% of the multi-storey reinforced concrete (RC) buildings in the Christchurch Central Business District were demolished after these earthquakes, even when only minor structural damage was present. Several factors influenced the decision of demolition instead of repair, one of them being the uncertainty of the seismic capacity of a damaged structure. To provide more insight into this topic, the investigation conducted in this thesis evaluated the residual capacity of moderately damaged RC walls and the effectiveness of repair techniques to restore the seismic performance of heavily damaged RC walls. The research outcome provided insights for developing guidelines for post-earthquake assessment of earthquake-damaged RC structures. The methodology used to conduct the investigation was through an experimental program divided into two phases. During the first phase, two walls were subjected to different types of pre-cyclic loading to represent the damaged condition from a prior earthquake, and a third wall represented a repair scenario with the damaged wall being repaired using epoxy injection and repair mortar after the pre-cyclic loading. Comparisons of these test walls to a control undamaged wall identified significant reductions in the stiffness of the damaged walls and a partial recovery in the wall stiffness achieved following epoxy injection. Visual damage that included distributed horizontal and diagonal cracks and spalling of the cover concrete did not affect the residual strength or displacement capacity of the walls. However, evidence of buckling of the longitudinal reinforcement during the pre-cyclic loading resulted in a slight reduction in strength recovery and a significant reduction in the displacement capacity of the damaged walls. Additional experimental programs from the literature were used to provide recommendations for modelling the response of moderately damaged RC walls and to identify a threshold that represented a potential reduction in the residual strength and displacement capacity of damaged RC walls in future earthquakes. The second phase of the experimental program conducted in this thesis addressed the replacement of concrete and reinforcing steel as repair techniques for heavily damaged RC walls. Two walls were repaired by replacing the damaged concrete and using welded connections to connect new reinforcing bars with existing bars. Different locations of the welded connections were investigated in the repaired walls to study the impact of these discontinuities at the critical section. No significant changes were observed in the stiffness, strength, and displacement capacity of the repaired walls compared to the benchmark undamaged wall. Differences in the local behaviour at the critical section were observed in one of the walls but did not impact the global response. The results of these two repaired walls were combined with other experimental programs found in the literature to assemble a database of repaired RC walls. Qualitative and quantitative analyses identified trends across various parameters, including wall types, damage before repair, and repair techniques implemented. The primary outcome of the database analysis was recommendations for concrete and reinforcing steel replacement to restore the strength and displacement capacity of heavily damaged RC walls.

Images, eqnz.chch.2010

Photos taken in Lyttelton on April 20 showing the demolitions on London Street following the February 22 earthquake. File reference: CCL-2011-04-20-Lyttelton-Demolitions-P1120099 From the collection of Christchurch City Libraries