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Research papers, University of Canterbury Library

© 2019, Springer-Verlag GmbH Germany, part of Springer Nature. Prediction of building collapse due to significant seismic motion is a principle objective of earthquake engineers, particularly after a major seismic event when the structure is damaged and decisions may need to be made rapidly concerning the safe occupation of a building or surrounding areas. Traditional model-based pushover analyses are effective, but only if the structural properties are well understood, which is not the case after an event when that information is most useful. This paper combines hysteresis loop analysis (HLA) structural health monitoring (SHM) and incremental dynamic analysis (IDA) methods to identify and then analyse collapse capacity and the probability of collapse for a specific structure, at any time, a range of earthquake excitations to ensure robustness. This nonlinear dynamic analysis enables constant updating of building performance predictions following a given and subsequent earthquake events, which can result in difficult to identify deterioration of structural components and their resulting capacity, all of which is far more difficult using static pushover analysis. The combined methods and analysis provide near real-time updating of the collapse fragility curves as events progress, thus quantifying the change of collapse probability or seismic induced losses very soon after an earthquake for decision-making. Thus, this combination of methods enables a novel, higher-resolution analysis of risk that was not previously available. The methods are not computationally expensive and there is no requirement for a validated numerical model, thus providing a relatively simpler means of assessing collapse probability immediately post-event when such speed can provide better information for critical decision-making. Finally, the results also show a clear need to extend the area of SHM toward creating improved predictive models for analysis of subsequent events, where the Christchurch series of 2010–2011 had significant post-event aftershocks.

Images, UC QuakeStudies

A view across Worcester Street in Linwood to a block of shops, including Easy Traders Whiteware and Furniture. Masonry, structural components and the Easy Traders building's veranda have collapsed onto the road. The whole back section of the shops has also collapsed. The site is enclosed by a safety fence.

Images, UC QuakeStudies

A photograph of the earthquake damage to a block of buildings on Lichfield Street. The top floor of the middle building has collapsed and the rubble has spilled onto the street. A large section of the closest building has also collapsed. Most of the rubble has since been cleared from the footpath.

Images, UC QuakeStudies

A photograph of the earthquake damage to the Canterbury Provincial Chambers Building on Durham Street. Large sections of the masonry have collapsed, spilling onto the road. Wire fencing has been placed around the building as a cordon. Scaffolding erected up the side has collapsed.

Images, UC QuakeStudies

A photograph of the earthquake damage to the Canterbury Provincial Chambers Building on Durham Street. Large sections of the masonry have collapsed, spilling onto the road. Wire fencing has been placed around the building as a cordon. Scaffolding erected up the side has collapsed.

Images, UC QuakeStudies

A photograph of the rubble from the Observatory tower in the South Quad of the Christchurch Arts Centre. The tower collapsed during the 22 February 2011 earthquake. A digger was used to clear the rubble away from the building. Scaffolding constructed around the tower has also collapsed and is amongst the rubble.

Images, UC QuakeStudies

Damage to a residential property in Richmond. The brick wall of the garage has collapse inward, and the roof fallen in on top of it. The driveway is badly cracked and buckled. The photographer comments, "These photos show our old house in River Rd. The brick garage just collapsed, pulling the gate over as it fell".

Images, Alexander Turnbull Library

A man representing 'EQC' (Earthquake Commission) talks to a couple outside their collapsed house. He says 'Unfortunately, this is a NORTH Canterbury collapse - so you'll only get your first $100,000 back.' Context: This refers both to the collapse of the South Canterbury Finance Company and to the problems that people are having with insurance companies in North Canterbury after the first Christchurch earthquake on September 4th 2010. Quantity: 1 digital cartoon(s).