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Images for February; more images...

Images, eqnz.chch.2010

Flowers left under the Peace Bell at the Christchurch Botanic Gardens in commemoration of the anniversary of the 22 February 2011 earthquake. File reference: CCL-2014-02-22-22February2014 DSC_1215.JPG Photo taken by Valerie Livingstone. From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

Flowers left under the Peace Bell at the Christchurch Botanic Gardens in commemoration of the anniversary of the 22 February 2011 earthquake. File reference: CCL-2014-02-22-22February2014 DSC_1214.JPG Photo taken by Valerie Livingstone. From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

Messages strung on rope by the Peace Bell at the Christchurch Botanic Gardens in commemoration of the anniversary of the 22 February 2011 earthquake. File reference: CCL-2014-02-22-22February2014 DSC_1217.JPG Photo taken by Valerie Livingstone. From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

Messages strung on rope by the Peace Bell at the Christchurch Botanic Gardens in commemoration of the anniversary of the 22 February 2011 earthquake. File reference: CCL-2014-02-22-22February2014 DSC_1216.JPG Photo taken by Valerie Livingstone. From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

Messages strung on rope by the Peace Bell at the Christchurch Botanic Gardens in commemoration of the anniversary of the 22 February 2011 earthquake. File reference: CCL-2014-02-22-22February2014 DSC_1218.JPG Photo taken by Valerie Livingstone. From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

After my visit at the hospital for physiotherapy on my hand I took a walk around the city on my way home. Demolition of the Victoria Square apartments February 12, 2014 Christchurch New Zealand. www.s...

Research papers, The University of Auckland Library

During the Christchurch earthquake of February 2011, several midrise reinforced concrete masonry (RCM) buildings showed performance levels that fall in the range of life safety to near collapse. A case study of one of these buildings, a six-story RCM building deemed to have reached the near collapse performance level, is presented in this paper. The RCM walls on the second floor failed due to toe crushing, reducing the building's lateral resistance in the east–west direction. A three-dimensional (3-D) nonlinear dynamic analysis was conducted to simulate the development of the governing failure mechanism. Analysis results showed that the walls that were damaged were subjected to large compression loads during the earthquake, which caused an increase in their in-plane lateral strength but reduced their ductility capacity. After toe crushing failure, axial instability of the model was prevented by a redistribution of gravity loads. VoR - Version of Record

Articles, UC QuakeStudies

A copy of a letter from Hugo Kristinsson which was sent to Prince William, the Duke of Cambridge, on 2 March 2014 . The letter was sent on behalf of Empowered Christchurch, as a response to the letter read by the Prince at the official Civic Memorial Service on the 22 February 2014. Kristinsson thanks the Prince for his letter and updates him on the progress of the rebuild. He expresses his respect for King George VI and Queen Elizabeth for their compassion in the early 1940s to the victims of bombing raids during the war and acknowledge's Prince William and Prince Harry's philanthropy through The Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry and The Princes' Charities Forum. Lastly he implores the Prince and the Duchess of Cambridge to visit residents from the 'low-lying seaside side of the city' who 'feel that their plight has been trivialised by the authorities in favour of prestigious big-budget projects'.

Research papers, The University of Auckland Library

A non-destructive hardness testing method has been developed to investigate the amount of plastic strain demand in steel elements subjected to cyclic loading. The focus of this research is on application to the active links of eccentrically braced frames (EBFs), which are a commonly used seismic-resisting system in modern steel framed buildings. The 2010/2011 Christchurch earthquake series, especially the very intense February 22 shaking, which was the first earthquake worldwide to push complete EBF systems fully into their inelastic state, generating a moderate to high level of plastic strain in EBF active links, for a range of buildings from 3 to 23 storeys in height. This raised two important questions: 1) what was the extent of plastic deformation in active links; and 2) what effect does that have to post-earthquake steel properties? This project comprised determining a robust relationship between hardness and plastic strain in order to be able to answer the first question and provide the necessary input into answering the second question. A non-destructive Leeb (portable) hardness tester (model TH170) has been used to measure the hardness, in order to determine the plastic strain, in hot rolled steel universal sections and steel plates. A bench top Rockwell B was used to compare and validated the hardness measured by the portable hardness tester. Hardness was measured from monotonically strained tensile test specimens to identify the relationship between hardness and plastic strain demand. Test results confirmed a good relationship between hardness and the amount of monotonically induced plastic strain. Surface roughness was identified as an important parameter in obtaining reliable hardness readings from a portable hardness reader. A proper surface preparation method was established by using three different cleaning methods, finished with hand sanding to achieve surface roughness coefficients sufficiently low not to distort the results. This work showed that a test surface roughness (Ra) is not more than 1.6 micron meter (μm) is required for accurate readings from the TH170 tester. A case study on an earthquake affected building was carried out to identify the relationship between hardness and amount of plastic strain demand in cyclically deformed active links. Hardness was carried out from active links shown visually to have been the most affected during one of the major earthquake events. Onsite hardness test results were then compared with laboratory hardness test results. A good relationship between hardness from onsite and laboratory was observed between the test methods; Rockwell B bench top and portable Leeb tester TH170. Manufacturing induced plastic strain in the top and bottom of the webs of hot rolled sections were discovered from this research, an important result which explains why visual effects of earthquake induced active link yielding (eg cracked or flaking paint) was typically more prevalent over the middle half depth of the active link. The extent of this was quantified. It was also evident that the hardness readings from the portable hardness tester are influenced by geometry, mass effects and rigidity of the links. The final experimental stage was application of the method to full scale cyclic inelastic tested nominally identical active links subjected to loading regimes comprising constant and variable plastic strain demands. The links were cyclically loaded to achieve different plastic strain level. A novel Digital Image Correlation (DIC) technique was incorporated during the tests of this scale, to confirm the level of plastic strain achieved. Tensile test specimens were water jet cut from cyclically deformed webs to analyse the level of plastic strain. Test results show clear evidence that cyclically deformed structural steel elements show good correlation between hardness and the amount of plastic strain demand. DIC method was found to be reliable and accurate to check the level of plastic strain within cyclically deformed structural steel elements.