A photograph of the former site of the house at 432 Oxford Street. The house was demolished after the land was zoned Red. Grass has begun to grow over the site. The houses in the neighbouring sites have also been demolished.
The sign reads: The CTV Building was headquarters of Canterbury Television (CTV) and also housed King’s Education language School, a medical clinic, Hair Consultants, Relationship Services and a nursing school. On February 22nd 2011 the building collapsed as a result of a major earthquake. Sadly, 115 people who were in the building lost their l...
A photograph of the former site of Siobhan Murphy's house at 436 Oxford Terrace. Murphy's house was demolished after her land was zoned Red. Grass has grown over the site.
A photograph of the former site of Siobhan Murphy's house at 436 Oxford Terrace. Murphy's house was demolished after her land was zoned Red. Grass has grown over the site.
A photograph of the former site of Siobhan Murphy's house at 436 Oxford Terrace. Murphy's house was demolished after her land was zoned Red. Grass has grown over the site.
A photograph of the former site of Siobhan Murphy's house at 436 Oxford Terrace. Murphy's house was demolished after her land was zoned Red. Grass has grown over the site.
A photograph of the former site of Siobhan Murphy's house at 436 Oxford Terrace. Murphy's house was demolished after her land was zoned Red. Grass has grown over the site.
A photograph of the former site of Doug Sexton's house at 378 Oxford Terrace. Sexton's house was demolished after his land was zoned Red. Grass has begun to grow in the site.
A photograph of the former site of Robin Duff's house at 386 Oxford Terrace. Duff's house was demolished after his land was zoned Red. Grass has begun to grow on the site.
A photograph of the former site of Doug Sexton's house at 378 Oxford Terrace. Sexton's house was demolished after his land was zoned Red. Grass has begun to grow in the site.
A photograph of the former site of Robin Duff's house at 386 Oxford Terrace. Duff's house was demolished after his land was zoned Red. Grass has begun to grow on the site.
A photograph looking east along Oxford Terrace from outside the former site of Donna Allfrey's house. Allfrey's house was demolished after her land was zoned Red. The sites of many other demolished houses can be seen to the left.
Deformational properties of soil, in terms of modulus and damping, exert a great influence on seismic response of soil sites. However, these properties for sands containing some portion of fines particles have not been systematically addressed. In addition, simultaneous modelling of the modulus and damping behaviour of soils during cyclic loading is desirable. This study presents an experimental and computational investigation into the deformational properties of sands containing fines content in the context of site response analysis. The experimental investigation is carried on sandy soils sourced from Christchurch, New Zealand using a dynamic triaxial apparatus while the computational aspect is based on the framework of total-stress one-dimensional (1D) cyclic behaviour of soil. The experimental investigation focused on a systematic study on the deformational behaviour of sand with different amounts of fines content (particle diameter ≤ 75µm) under drained conditions. The silty sands were prepared by mixing clean sand with three different percentages of fines content. A series of bender element tests at small-strain range and stress-controlled dynamic triaxial tests at medium to high-strain ranges were conducted on samples of clean sand and silty sand. This allowed measurements of linear and nonlinear deformational properties of the same specimen for a wide strain range. The testing program was designed to quantify the effects of void ratio and fines content on the low-strain stiffness of the silty sand as well as on the nonlinear stress-strain relationship and corresponding shear modulus and damping properties as a function of cyclic shear strains. Shear wave velocity, Vs, and maximum shear modulus, Gmax, of silty sand was shown to be significantly smaller than the respective values for clean sands measured at the same void ratio, e, or same relative density, Dr. However, the test results showed that the difference in the level of nonlinearity between clean sand and silty sands was small. For loose samples prepared at an identical relative density, the behaviour of clean sand was slightly less nonlinear as compared to sandy soils with higher fines content. This difference in the nonlinear behaviour of clean sand and sandy soils was negligible for dense soils. Furthermore, no systematic influence of fines content on the material damping curve was observed for sands with fines content FC = 0 to 30%. In order to normalize the effects of fines on moduli of sands, equivalent granular void ratio, e*, was employed. This was done through quantifying the participation of fines content in the force transfer chain of the sand matrix. As such, a unified framework for modelling of the variability of shear wave velocity, Vs, (or shear modulus, Gmax) with void ratio was achieved for clean sands and sands with fines, irrespective of their fines content. Furthermore, modelling of the cyclic stress-strain behaviour based on this experimental program was investigated. The modelling effort focused on developing a simple constitutive model which simultaneously models the soil modulus and damping relationships with shear strains observed in laboratory tests. The backbone curve of the cyclic model was adopted based on a modified version of Kondner and Zelasko (MKZ) hyperbolic function, with a curvature coefficient, a. In order to simulate the hysteretic cycles, the conventional Masing rules (Pyke 1979) were revised. The parameter n, in the Masing’s criteria was assumed to be a function of material damping, h, measured in the laboratory. As such the modulus and damping produced by the numerical model could match the stress-strain behaviour observed in the laboratory over the course of this study. It was shown that the Masing parameter n, is strain-dependent and generally takes values of n ≤ 2. The model was then verified through element test simulations under different cyclic loadings. It was shown that the model could accurately simulate the modulus and the damping simultaneously. The model was then incorporated within the OpenSees computational platform and was used to scrutinize the effects of damping on one-dimensional seismic site response analysis. For this purpose, several strong motion stations which recorded the Canterbury earthquake sequence were selected. The soil profiles were modelled as semi-infinite horizontally layered deposits overlying a uniform half-space subjected to vertically propagating shear waves. The advantages and limitations of the nonlinear model in terms of simulating soil nonlinearity and associated material damping were further scrutinized. It was shown that generally, the conventional Masing criteria unconservatively may underestimate some response parameters such as spectral accelerations. This was shown to be due to larger hysteretic damping modelled by using conventional Masing criteria. In addition, maximum shear strains within the soil profiles were also computed smaller in comparison to the values calculated by the proposed model. Further analyses were performed to study the simulation of backbone curve beyond the strain ranges addressed in the experimental phase of this study. A key issue that was identified was that relying only on the modulus reduction curves to simulate the stress-strain behaviour of soil may not capture the actual soil strength at larger strains. Hence, strength properties of the soil layer should also be incorporated to accurately simulate the backbone curve.
A photograph of the former site of a house at 58 Bangor Street. The house was demolished after the land was zoned Red. The grass has begun to grow over the site. The house behind has also been demolished, so that Oxford Terrace is now visible in the distance.
A photograph of the former sites of several houses on Bangor Street. The houses were demolished after the land was zoned Red. A stake has been placed in the ground to the left. A message written on the stake reads, "412 Oxford Terrace waste water". Grass has begun to grow in the empty sites.
A photograph of the former site of the Locke family's house at 392 Oxford Terrace. The Locke's house was deconstructed after their land was zoned Red. Wire fencing has been placed around the outside of the neighbouring property. The photographer comments, "The house was deconstructed and rebuilt on another site".
A photograph of the former site of the Locke family's house at 392 Oxford Terrace. The Locke's house was deconstructed after their land was zoned Red. Wire fencing has been placed around the outside of the neighbouring property. The photographer comments, "The house was deconstructed and rebuilt on another site".
Page 1 of Section A of the Christchurch Press, published on Tuesday 4 February 2014.
Page 5 of Section A of the Christchurch Press, published on Saturday 11 January 2014.
Page 19 of Section A of the Christchurch Press, published on Wednesday 19 February 2014.
A photograph of the site of Donna Allfrey's demolished house at 406 Oxford Terrace.
Site of government-owned company responsible for settling AMI policy-holders' claims for Canterbury earthquake damage.
Page 1 of Section A of the Christchurch Press, published on Tuesday 8 July 2014.
A charitable trust which began after the earthquakes to create and maintain temporary public parks on cleared sites in Christchurch.
The repair of Christchurch's earthquake damaged arts centre has revealed details hidden from view for forty years including a badminton court and the site of an old swimming pool.
Site of a residents' group formed to advocate and protect the rights of red-zoned home owners in the aftermath of the Canterbury earthquakes.
A photograph of the former sites of several houses on Bangor Street. The houses were demolished after the land was zoned Red.
A photograph of the former site of Donna Allfrey's house at 406 Oxford Terrace. Allfrey's house was demolished after her land was zoned Red.
A photograph of the former site of Donna Allfrey's house at 406 Oxford Terrace. Allfrey's house was demolished after her land was zoned Red.
A photograph of the former site of Doug Sexton's house at 378 Oxford Terrace. Sexton's house was demolished after his land was zoned Red.