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Research papers, University of Canterbury Library

Structural engineering is facing an extraordinarily challenging era. These challenges are driven by the increasing expectations of modern society to provide low-cost, architecturally appealing structures which can withstand large earthquakes. However, being able to avoid collapse in a large earthquake is no longer enough. A building must now be able to withstand a major seismic event with negligible damage so that it is immediately occupiable following such an event. As recent earthquakes have shown, the economic consequences of not achieving this level of performance are not acceptable. Technological solutions for low-damage structural systems are emerging. However, the goal of developing a low-damage building requires improving the performance of both the structural skeleton and the non-structural components. These non-structural components include items such as the claddings, partitions, ceilings and contents. Previous research has shown that damage to such items contributes a disproportionate amount to the overall economic losses in an earthquake. One such non-structural element that has a history of poor performance is the external cladding system, and this forms the focus of this research. Cladding systems are invariably complicated and provide a number of architectural functions. Therefore, it is important than when seeking to improve their seismic performance that these functions are not neglected. The seismic vulnerability of cladding systems are determined in this research through a desktop background study, literature review, and postearthquake reconnaissance survey of their performance in the 2010 – 2011 Canterbury earthquake sequence. This study identified that precast concrete claddings present a significant life-safety risk to pedestrians, and that the effect they have upon the primary structure is not well understood. The main objective of this research is consequently to better understand the performance of precast concrete cladding systems in earthquakes. This is achieved through an experimental campaign and numerical modelling of a range of precast concrete cladding systems. The experimental campaign consists of uni-directional, quasi static cyclic earthquake simulation on a test frame which represents a single-storey, single-bay portion of a reinforced concrete building. The test frame is clad with various precast concrete cladding panel configurations. A major focus is placed upon the influence the connection between the cladding panel and structural frame has upon seismic performance. A combination of experimental component testing, finite element modelling and analytical derivation is used to develop cladding models of the cladding systems investigated. The cyclic responses of the models are compared with the experimental data to evaluate their accuracy and validity. The comparison shows that the cladding models developed provide an excellent representation of real-world cladding behaviour. The cladding models are subsequently applied to a ten-storey case-study building. The expected seismic performance is examined with and without the cladding taken into consideration. The numerical analyses of the case-study building include modal analyses, nonlinear adaptive pushover analyses, and non-linear dynamic seismic response (time history) analyses to different levels of seismic hazard. The clad frame models are compared to the bare frame model to investigate the effect the cladding has upon the structural behaviour. Both the structural performance and cladding performance are also assessed using qualitative damage states. The results show a poor performance of precast concrete cladding systems is expected when traditional connection typologies are used. This result confirms the misalignment of structural and cladding damage observed in recent earthquake events. Consequently, this research explores the potential of an innovative cladding connection. The outcomes from this research shows that the innovative cladding connection proposed here is able to achieve low-damage performance whilst also being cost comparable to a traditional cladding connection. It is also theoretically possible that the connection can provide a positive value to the seismic performance of the structure by adding addition strength, stiffness and damping. Finally, the losses associated with both the traditional and innovative cladding systems are compared in terms of tangible outcomes, namely: repair costs, repair time and casualties. The results confirm that the use of innovative cladding technology can substantially reduce the overall losses that result from cladding damage.

Research papers, The University of Auckland Library

Following the 2010/2011 Canterbury (New Zealand) earthquakes the seismic design of buildings with precast concrete panels has received significant attention. Although this form of construction generally performed adequately in Christchurch, there were a considerable number of precast concrete panel connection failures. This observation prompted a review of more than 4700 panel details to establish representative details used in both existing and new multi-storey and low rise industrial precast concrete buildings. The detailing and quantity of each reviewed connection type in the sampled data is reported, and advantages and potential deficiencies of each connection type are discussed. Following the Canterbury earthquakes, it was observed that brittle failure had occurred in some grouted metal duct connections used for precast concrete wall panels, resulting in recommendations for more robust detailing of this connection type. A set of experimental tests was subsequently performed to investigate the in-plane seismic behaviour of precast concrete wall panel connections. This testing comprised of seven reversed cyclic in-plane tests of fullscale precast concrete wall panels having wall-to-foundation grouted metal duct connections. Walls with existing connection detailing were found to perform adequately when carrying low axial loads, but performance was found to be less satisfactory as the axial load and wall panel length increased. The use of new recommended detailing was observed to prevent brittle connection response and to improve the robustness of the reinforcement splice. A parametric investigation was conducted using the finite element method to predict the failure mode of metal duct connections. From the results of the parametric study on metal duct connections it was identified that there were three possible failure modes, being reinforcement fracture, concrete spalling without metal duct pull out, and concrete spalling with metal duct pull-out. An alternative simple analytical method was proposed in order to determine the type of connection failure without using a time-consuming finite element method. Grouted sleeves inserts are an alternative connector that is widely used to connect wall panels to the foundations. The two full-scale wall panels were subjected to reversed cyclic in-plane demands until failure of either the connection or the wall panel. Wall panel failure was due to a combination of connection reinforcement pulling-out from the coupler and reinforcement fracture. In addition, non-embedded grouted sleeve tests filled with different quality of grout were conducted by subjecting these coupler assemblages to cyclic and monotonic forces.

Research papers, The University of Auckland Library

Following the 2010/2011 Canterbury earthquakes the seismic design of buildings with precast concrete panels has received significant attention. Although this form of construction generally performed adequately in Christchurch, there were a considerable number of precast concrete panel connection failures. This observation prompted a review of more than 4700 panel details from 108 buildings to establish representative details used in both existing and new multi-storey and low rise industrial precast concrete buildings in three major New Zealand cities of Auckland, Wellington and Christchurch. Details were collected from precast manufacturers and city councils and were categorised according to type. The detailing and quantity of each reviewed connection type in the sampled data is reported, and advantages and potential deficiencies of each connection type are discussed. The results of this survey provide a better understanding of the relative prevalence of common detailing used in precast concrete panels and guidance for the design of future experimental studies. http://www.nzsee.org.nz/publications/nzsee-quarterly-bulletin/

Audio, Radio New Zealand

Billy Kristian of The Invaders shares his memories of Ray Columbus who has died at the age of 74. Islay Marsden of the University of Canterbury discusses what clearing rocks and silt from quake-induced landslides will do to the coastal environment. Kevin Furlong of Penn State University discusses the connection between the earthquakes and various faultline systems.

Images, Alexander Turnbull Library

The cartoon depicts the Minister of Earthquakes Gerry Brownlee, with a portaloo in place of a head. He holds in his hand a document which reads 'Govt appointed quake panel (Shipley etc) paid twice normal fees: $1000 - 1400 daily'. A voice from inside the toilet says 'It's because they're high calibre people!' Context: Earthquake Recovery Minister Gerry Brownlee lobbied his colleagues to pay a Government-appointed panel more than twice the recommended rate because he claimed they would not do it for less - even though he never asked them. On Mr Brownlee's advice, the Cabinet more than doubled the pay rates for the panel from the recommended fees, which was a daily rate of $360 to $655 for the panel chairman and $270 to $415 for panel members. The Cabinet increased this to $1400 a day for the chairman and $1000 a day for the other members. (NZ Herald, 9 August 2011) Quantity: 1 digital cartoon(s).

Audio, Radio New Zealand

Topics - If you like a quiet time, head for the Spanish city of Seville. Seville's silent summer, they're calling this. They've banned outdoor noise. Seville's been noisy; flamenco singers, old men playing dominoes, bar patrons chatting. The city councillors have now banned most of this, and they seem to have support. Gerry Brownlee the Earthquake Recovery Minister will have the final say over what happens to a piece of land near Christchurch airport, on the corner of Memorial Ave and Russley Road. It's currently zoned as rural, but industrial development could be on the cards. The NYT wonders why with so much violence in movies and games, the big Comic-con pop entertainment convention in San Diego is so peaceful. John Banks snapped phone-driving, we saw at the weekend. John Banks accused of breaking the law again, this time for using a cellphone while driving.

Audio, Radio New Zealand

Christchurch remembers six years on from the deadly earthquake. What panelists Ali Jones and James Nokise have been up to. John Gray from the Home Owners and Buyers Association believes the mayor is getting advice from self interest groups looking to shift the focus from their own shortcomings. Police in Hawkes Bay discovered 300 stolen garden gnomes with a growing trend to sell them on to fund meth purchases. Pie eating goalie in the UK has resigned for taking part in the bet that he would eat a pie during his team's match.

Audio, Radio New Zealand

Topics - ready with the pumps at last this time, but thankfully not as much rain - so far - as feared for people in the low-lying Flockton Basin in Christchurch. Labour's proposing a special court be set up just to deal with earthquake insurance claims, as part of a policy around the Christchurch rebuild. The policy would see an Earthquake Court established to try to speed up the settling of 9,755 outstanding "over cap" insurance claims. John Banks will be gone by Friday from Parliament, at the behest of the ACT party with a gentle nudge from the Nats as well. The PM thinks it's a joke that the Civilian political party, run by Ben Uffindell and named after his satirical webite, will receive $33,000 of taxpayer funding for the coming election.

Audio, Radio New Zealand

Christchurch central seems to have a business micro-climate. And right now it's chilly. The CBD is nothing like it used to be before the 2011 earthquake and those businesses that re-opened say they really had no choice because of the demands of insurance companies.

Audio, Radio New Zealand

So what's the Prime Minister Jacinda Ardern got to look forward to when she's back at work? Construction firms falling over, business confidence at a nine-year low, unemployment rising and New Zealand is desperate need of infrastructure to cope with its 10 percent population shock in the last five years. Welcome back Ms Ardern! Ebert Construction is the latest construction company to go belly-up. The Panelists consider why, when the country needs new buildings the most, construction companies aren't making the grade? Peter Silcock of Civil Contractors talks bout the failing of processes and business models used by building firms. Christchurch central seems to have a business micro-climate. And right now it's chilly. The CBD is nothing like it used to be before the 2011 earthquake and those businesses that re-opened say they really had no choice because of the demands of insurance companies. The Kingsland Business Society in Auckland is offering free child minding for couples who go out for the evening in the suburb. United States federal air marshals now follow seemingly ordinary citizens not suspected of a crime, nor on any terrorist watch list. It's a new surveillance programme called "Quiet Skies" and it collects extensive information on travellers based on their behaviour on flights and especailly in airports.

Audio, Radio New Zealand

A report into why Statistics House failed in the November earthquake has revealed a design flaw in the building, and the Government says all buildings nationwide like Statistics House will now need checking. Christchurch man Jeremy Teaguea wants to overturn the law making wearing a bike helment compulsory. Former cyclone Debbie will make her presence felt here over the next week. Weatherman Richard Green tells us what to expect. Going up for Labour and a downward turn in the polls for National. Is it really because of Jacinda Ardern and Bill English?

Audio, Radio New Zealand

A fault line on Dunedin's doorstep could cause an earthquake as destructive as 2010's Canterbury quake. Microbiologist Siouxsie Wiles explains why the new superbug CPE is a serious threat. A New Zealand Medical Journal article warns a group of bacteria known as Carbapenem-resistant Enterobacteriaceae pose an enormous risk to people in intensive care, or having bone marrow or lung or liver transplants. Mercedes-Benz has successfully trialled a new app called Croove, CROOVE, which will let Mercedes owners rent out their cars. Now it's being officially rolled out. The panellists discuss the sign outside a pub in New Brighton reading "Vegan buffet. Just kidding now get away from our sign - you pansy." Is this just a joke or is it deeply offensive? The Kentucky doctor dragged off a United Airlines flight from Chicago earlier this month has received a financial settlement from the airline.