73 months after the earthquake that damaged it, the jetty at South New Brighton Domain is still not repaired. Seven years ago it was straight and level. Dull, flat and orrible (horrible) light meant this image was destined to become monochrome!
Impact between structures of bridge sections can play a major, unexpected role in seismic structural damage. Linear and non-linear models are developed to analyze structural impact and response of two single-degree-of-freedom structures, representing adjacent buildings or bridge sections. The analyses presented assess probability of impact, displacement change due to impact, and the probability of increased displacement due to impact. These are assessed over a matrix of structural periods for each degree-of-freedom, different impact coefficients of restitution, and a probabilistically scaled suite of earthquake events. Linear versus non-linear effects are assessed using a Ramberg-Osgood non-linear model for column inelasticity. The normalized distance, or gap-ratio (GR), defined as a percentage of the summed spectral displacements, is used to create probabilistic design requirements. Increasing GR and structural periods that are similar (T2/T1~0.8-1.25) significantly decrease the likelihood of impact, and vice-versa. Including column inelasticity and decreasing coefficient of restitution decrease displacement increases due to impact and thus reduce potential damage. A minimum GR~0.5-0.9 ensures that any displacement increases will be less than 10% for 90% of ground motions over all structural period combinations (0.2-5.0sec). These results enable probabilistic design guidelines to manage undesirable effects of impact– an important factor during the recent Canterbury, New Zealand Earthquakes.
A linear and non-linear model are developed to analyze the structural impact and response of two single degree of freedom structures, representing adjacent buildings or bridge sections. Different impact coefficients of restitution, normalized distances between structures and a range of different structural periods are considered. The probability of impact and the displacement changes that can result from these collisions are computed. The likelihood of an increase in displacement is quantified in a probabilistic sense. A full matrix of response simulations are performed to individually investigate and delineate the effects of inter-structure gap-ratio, period ratios, structural non-linearity and impact elasticity. Column inelasticity is incorporated through the use of a Ramberg-Osgood type hysteresis rule. The minimum normalized distance, or gap-ratio, required between two structures to ensure that the likelihood of increased displacement of more than 10% for either structure for 90% of the given earthquake ground motions is assessed as one of many possible design risk bounds. Increased gap ratio, defined as a percentage of spectral displacement, is shown to reduce the likelihood of impact, as well as close structural periods. Larger differences in the relative periods of the two structures were seen to significantly increase the likelihood of impact. Inclusion of column inelasticity and higher plasticity of impact reduce displacement increases from impact and thus possible further damage to the structures. Such information can be used as a guideline to manage undesirable effects of impact in design - a factor that has been observed to be very important during the recent Canterbury, New Zealand Earthquakes.
The 4 September, 22 February, and 13 June earthquakes experienced in Canterbury, New Zealand would have been significant events individually. Together they present a complex and unprecedented challenge for Canterbury and New Zealand. The repetitive and protracted nature of these events has caused widespread building and infrastructure damage, strained organisations’ financial and human resources and challenged insurer and investor confidence. The impact of the earthquakes was even more damaging coming in the wake of the worst worldwide recession since the great depression of the 1930s. However, where there is disruption there is also opportunity. Businesses and other organisations will drive the physical, economic and social recovery of Canterbury, which will be a dynamic and long-term undertaking. Ongoing monitoring of the impacts, challenges and developments during the recovery is critical to maintaining momentum and making effective mid-course adjustments. This report provides a synthesis of research carried out by the Resilient Organisations (ResOrgs) Research Programme1 at the University of Canterbury and Recover Canterbury in collaboration with Opus Central Laboratories (part of Opus International Consultants). The report includes discussions on the general state of the economy as well as data from three surveys (two conducted by ResOrgs and one by Recover Canterbury) on business impacts of the earthquakes, population movements and related economic recovery issues. This research and report offers two primary benefits:
I think all the National Banks in the country have been either closed or rebranded ANZ, but this one on the corner of Colombo and Armagh Streets is still inside the CBD red zone and has yet to be touched. I have heard that this building is staying so whether it becomes an ANZ or not time will tell. This was one of the top five busiest pedest...
A couple of city blocks away from the now damaged Cathedral a temporary $4million cathedral has been built using large cardboard tubes and sheeting.
Haha! This is the day before Mainzeal (see sign on fence at left) announced they had gone into receivership owing millions to the banks and sub-contractors like Smiths whose equipment is here.
185 pieces of Rock from Halswell Quarry to represent the 185 lives lost as a result of the 22/02/11 earthquake.
Following the 5.8 and 6.0 quakes of 23/12/11 there is further damage to the track separating the Bexley Wetlands from the Pacific Park housing area.
Sitting on the concrete in front of what was my model railway room - a single car garage at the rear of our house in Pacific Park. Reason it is here - one of the houses behind my old house is going to be trucked out. See previous photo.
The statue of Captain Cook looks over an empty Victoria Square with autumn leaves lying around. This used to be a very tidy and busy area, but is now nearly all fenced off. Pedestrian access to this section was established about five or six months ago.
A suburban "red zone" house from Velsheda Street (#11), Pacific Park, is finally cut in half and loaded ready for transport out and a future life somewhere else in the South Island, whether it be close by or way down south in Gore or Clinton (where a few have gone already). The house has been stripped of it's bricks and jacked up for over four m...
Following the 5.8 and 6.0 quakes of 23/12/11 there is further damage to the track separating the Bexley Wetlands from the Pacific Park housing area.
Today was the first time I have been to the earthquake memorial since it was completed and opened on 22nd February 2017, six years after the devastating quake that killed the 185 that are named on this wall. I knew two of the people on the list.
Went for a drive down to South New Brighton/Southshore after work today to see what interesting birds I could find on the Estuary (godwits, skuas, terns etc), but passing Jellico Street, I saw this. T-Rex the seismic survey truck from the University of Texas that is visiting the city (first time out of USA). Weighs 30 tonne and from the marks o...
Awaiting the demolition ball! See the hole punched in by the neighbouring building (now demolished) during the February 22 2011 earthquake. This building is leaning to the north (left) while it's now demolished neighbour was leaning to the south (right). All because the crap land gave way underneath!
Deconstruction has been halted, but this was the front of Christchurch's most famous landmark. The tower/spire was above the nearest bit of remains.
Across the river were a row of several houses - all gone now. That side of the river is "Red Zone" and will be devoid of houses soon. #4077
Exactly 2½ years (27/02/11 - 27/08/13) since the Queensland (Australia) SAR team TF1 spray painted this on a concrete fence in Armagh Street. Not many of these signs left now as many buildings have been demolished.
Went for a drive down to South New Brighton/Southshore after work today to see what interesting birds I could find on the Estuary (godwits, skuas, terns etc), but passing Jellico Street, I saw this. T-Rex the seismic survey truck from the University of Texas that is visiting the city (first time out of USA). Weighs 30 tonne and from the marks o...
Cunningham House at the Christchurch Botanic Gardens is still closed due to earthquake damage. I wonder if it will ever re-open or suffer the demolition fate many other iconic structures in Christchurch have.
The damaged (and once iconic Christchurch Cathedral) waits it's fate (repaired or demolish/rebuild) with the Millenium hotel in background.
Went for a drive down to South New Brighton/Southshore after work today to see what interesting birds I could find on the Estuary (godwits, skuas, terns etc), but passing Jellico Street, I saw this. T-Rex the seismic survey truck from the University of Texas that is visiting the city (first time out of USA). Weighs 30 tonne and from the marks o...
The Avon River loop around Porritt Park has risen with the quake. Huge cracks are all through Porritt Park (rowing, hockey and cricket venue). The main section of the river is in a man made cut behind the buildings in the background of this pic.
The historic Deans Homestead 23 months ago. Now destroyed in the Canterbury earthquake of September 4th 2010. This photo was taken on the PSNZ 2008 Southern Regional Photographic Convention bus trip.
The South New Brighton jetty was rebuilt a couple of years before the earthquakes wrecked it. Was closed to the public for about four years but is open now.
A view that was impossible six years ago. There was a group of buildings including another high-rise in the vacant area in the middle ground.
Only two of 20 houses left in the Rawhiti Earthquake Village. This from the sign on perimeter fence: "Since 2011, Rawhiti Domain has been used to provide temporary accommodation for those affected by the Canterbury earthquakes. Over 200 households have used the 20 houses while their own homes have been repaired or rebuilt. The demand for acco...
According to the sign it can take about 30 minutes to walk from the entry point (near the small statue) to the centre and out again. What you can do with a few thousand old bricks and gravel. See next photo for more detail.
Trees cut down so a house being removed from behind could get out above the fence on one of those elevating house removal trailers. I don't know the story about the yellow (recycling) wheelie bin - the wheels have been removed.