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Images, eqnz.chch.2010
The centennial pool demolition is under way. On a walk around the city to catch up on events happening June 18, 2014 Christchurch New Zealand. Swimsuits have been hung on the fence around the Centennial Pool by campaigners against the complex's demolition. The Armagh St facility is being pulled down to make way for the new Margaret Mahy Fami...
Seismic response of adjacent structures on dry and saturated sand
Research papers, The University of Auckland Library
Soil-structure interaction (SSI) has been widely studied during the last decades. The influence of the properties of the ground motion, the structure and the soil have been addressed. However, most of the studies in this field consider a stand-alone structure. This assumption is rarely justifiable in dense urban areas where structures are built close to one another. The dynamic interaction between adjacent structures has been studied since the early 1970s, mainly using numerical and analytical models. Even though the early works in this field have significantly contributed to understanding this problem, they commonly consider important simplifications such as assuming a linear behaviour of the structure and the soil. Some experimental works addressing adjacent structures have recently been conducted using geotechnical centrifuges and 1g shake tables. However, further research is needed to enhance the understanding of this complex phenomenon. A particular case of SSI is that of structures founded in fine loose saturated sandy soil. An iconic example was the devastating effects of liquefaction in Christchurch, New Zealand, during the Canterbury earthquake in 2011. In the case of adjacent structures on liquefiable soil, the experimental evidence is even scarcer. The present work addresses the dynamic interaction between adjacent structures by performing multiple experimental studies. The work starts with two-adjacent structures on a small soil container to expose the basics of the problem. Later, results from tests considering a more significant number of structures on a big laminar box filled with sand are presented. Finally, the response of adjacent structures on saturated sandy soil is addressed using a geotechnical centrifuge and a large 1g shake table. This research shows that the acceleration, lateral displacement, foundation rocking, damping ratio, and fundamental frequency of the structure of focus are considerably affected by the presence of neighbouring buildings. In general, adjacent buildings reduced the dynamic response of the structure of focus on dry sand. However, the acceleration was amplified when the structures had a similar fundamental frequency. In the case of structures on saturated sand, the presence of adjacent structures reduced the liquefaction potential. Neighbouring structures on saturated sand also presented larger rotation of the footing and lateral displacement of the top mass than that of the stand-alone case.
Banks Avenue, Richmond - Photograph 03
Images, UC QuakeStudies
Cars raise dust from dried liquefaction on Westminster Street in St Albans, near the intersection with Forfar Street. The photographer comments, "Dust from dried liquefaction made everything grey and gritty".
Banks Avenue, Richmond - Photograph 02
Images, UC QuakeStudies
Cars raise dust from dried liquefaction on Westminster Street in St Albans, near the intersection with Forfar Street. The photographer comments, "Dust from dried liquefaction made everything grey and gritty".
Photograph by Paul Corliss 1665
Images, UC QuakeStudies
A photograph captioned by Paul Corliss, "Lyttelton Engineering and dry dock area".
Photograph by Paul Corliss 1667
Images, UC QuakeStudies
A photograph captioned by Paul Corliss, "Lyttelton Engineering and dry dock area".
Photograph by Paul Corliss 1668
Images, UC QuakeStudies
A photograph captioned by Paul Corliss, "Lyttelton Engineering and dry dock area".
Photograph by Paul Corliss 1666
Images, UC QuakeStudies
A photograph captioned by Paul Corliss, "Lyttelton Engineering and dry dock area".
Photograph by Paul Corliss 1669
Images, UC QuakeStudies
A photograph captioned by Paul Corliss, "Lyttelton Engineering and dry dock area".
BeckerFraserPhotos February 2011 photograph 248
Images, UC QuakeStudies
A merry-go-round at Sullivan Park in Avonside. Its base is covered in dried liquefaction.
Helen Devereux Photograph 058
Images, UC QuakeStudies
Dried silt from liquefaction on a residential street. In the background workers lay new tar seal.
BeckerFraserPhotos February 2011 photograph 243
Images, UC QuakeStudies
A large crack in the ground at Sullivan Park in Avonside. A large deposit of liquefaction has dried around it.
BeckerFraserPhotos February 2011 photograph 250
Images, UC QuakeStudies
The end of Acland Avenue in Avonside. Dried deposits of liquefaction can be seen covering sections of the footpath and road.
BeckerFraserPhotos February 2011 photograph 341
Images, UC QuakeStudies
A badly damaged footpath at the end of Acland Avenue in Avonside. Dried liquefaction silt can be seen covering the pavement.
BeckerFraserPhotos February 2011 photograph 247
Images, UC QuakeStudies
A pair of see-saws at Sullivan Park in Avonside. Dried liquefaction silt can be seen in the lower section of the photograph.
BeckerFraserPhotos February 2012 photograph 0143
Images, UC QuakeStudies
A photograph of dried liquefaction covering the floor of a house. The photograph is captioned by BeckerFraserPhotos, "8A Waygreen Avenue".
BeckerFraserPhotos February 2011 photograph 212
Images, UC QuakeStudies
The driveway of a house on Bracken Street in Avonside that has been warped by earthquakes. Dry deposits of liquefaction can be seen on the driveway.
BeckerFraserPhotos February 2011 photograph 244
Images, UC QuakeStudies
A large crack in the ground at Sullivan Park in Avonside. A large deposit of liquefaction has dried around it, and plants are growing up through the crack.
BeckerFraserPhotos February 2011 photograph 245
Images, UC QuakeStudies
A large crack in the ground at Sullivan Park in Avonside. A large deposit of liquefaction has dried around it, and plants are growing up through the crack.
BeckerFraserPhotos February 2011 photograph 318
Images, UC QuakeStudies
A view down Galbraith Avenue in Avonside. The footpath and road have been cracked by the 4 September 2010 earthquake. Small deposits of dry liquefaction silt can be seen on patches of the road.
BeckerFraserPhotos February 2011 photograph 319
Images, UC QuakeStudies
A view down Galbraith Avenue in Avonside. The footpath and road have been cracked by the 4 September 2010 earthquake. Small deposits of dry liquefaction silt can be seen on patches of the road.
BeckerFraserPhotos February 2011 photograph 340
Images, UC QuakeStudies
Two damaged driveways on Acland Avenue in Avonside. Dried liquefaction can be seen in the gap between the two driveways, and behind them the ground has sunk. Weeds have grown through cracks in the concrete.
BeckerFraserPhotos February 2011 photograph 339
Images, UC QuakeStudies
Two damaged driveways on Acland Avenue in Avonside. Dried liquefaction can be seen in the gap between the two driveways, and behind them the ground has sunk. Weeds have grown through cracks in the concrete.
Ngāi Tūāhuriri Story: Te Ao Whakamarakai
Videos, UC QuakeStudies
Claimed as a fishing reserve by the Tuahiwi chief Te Aika but sold by government, this area used to have eel weirs and eel drying. The land within the horseshoe lake also contains an urupā (cemetery).
BeckerFraserPhotos April 2011 photograph 039
Images, UC QuakeStudies
Severe damage on a New Brighton Road. It had to be reformed and raised up 40 cm. A pile of dried liquefaction has been shovelled onto the footpath. Road cones mark out the uneven surfaces on the road.
BeckerFraserPhotos February 2011 photograph 270
Images, UC QuakeStudies
The sunken footpath around the base of a power pole on Bracken Street in Avonside. Dry silt from liquefaction can be seen mixed in with the gravel around it as a result of the 4 September 2010 earthquake.
BeckerFraserPhotos February 2011 photograph 404
Images, UC QuakeStudies
A house on Avonside Drive showing damage from the 4 September 2010 earthquake. Numerous cracks in the masonry can be seen, and several sections of brick have fallen off the walls. The building's porch has also collapsed. A pile of dried liquefaction is visible in the driveway.
BeckerFraserPhotos February 2012 photograph 0659
Images, UC QuakeStudies
A photograph of the spire of ChristChurch Cathedral sitting on the ground in Cathedral Square. The photograph is captioned by BeckerFraserPhotos, "The dry summer grass shows the passing of the seasons while the top of the spire of the ChristChurch Cathedral stays still".
BeckerFraserPhotos February 2011 photograph 399
Images, UC QuakeStudies
A house on Avonside Drive showing damage from the 4 September 2010 earthquake. Numerous cracks in the masonry can be seen, and several sections of brick have fallen off the walls. The building's porch has also collapsed. A pile of dried liquefaction is visible in the driveway.
WEMO ERT Set 4 - March 2011 - Photograph 11
Images, UC QuakeStudies
A photograph of a sign taped to a window. The sign includes a bullet pointed list of humorous observations about Christchurch following the February 2011 earthquake. The sign reads, "You know you're from Christchurch when: you use the term 'liquefaction' and 'seismic design' in casual conversation; digging a hole and shitting in your garden is no longer weird; your mayor describes the city as munted. If he means FUBARed, you agree; weaving through car size potholes on the street is no longer weird; a shower is heaven; you have a preference of which kind of silt you'd rather shovel, dry or wet; you see tanks...driving around town; you are always noting what you are under; due to frequent aftershocks during the night, you sleep like a baby - every 10 minutes you wake up and shit yourself".
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