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Geologic and geomorphic influence on the spatial extent of lateral spreadi…

Research papers, University of Canterbury Library

Liquefaction-induced lateral spreading during earthquakes poses a significant hazard to the built environment, as observed in Christchurch during the 2010 to 2011 Canterbury Earthquake Sequence (CES). It is critical that geotechnical earthquake engineers are able to adequately predict both the spatial extent of lateral spreads and magnitudes of associated ground movements for design purposes. Published empirical and semi-empirical models for predicting lateral spread displacements have been shown to vary by a factor of <0.5 to >2 from those measured in parts of Christchurch during CES. Comprehensive post- CES lateral spreading studies have clearly indicated that the spatial distribution of the horizontal displacements and extent of lateral spreading along the Avon River in eastern Christchurch were strongly influenced by geologic, stratigraphic and topographic features.

Repaired Reinforced Concrete Walls and Lower-Damage Modifications

Research papers, University of Canterbury Library

As a result of the Canterbury earthquakes, over 60% of the concrete buildings in the Christchurch Central Business District have been demolished. This experience has highlighted the need to provide guidance on the residual capacity and repairability of earthquake-damaged concrete buildings. Experience from 2010 Chile indicates that it is possible to repair severely damaged concrete elements (see photo at right), although limited testing has been performed on such repaired components. The first phase of this project is focused on the performance of two lightly-reinforced concrete walls that are being repaired and re-tested after damage sustained during previous testing.

The Undrained Cyclic Response of Monterey Sand in Direct Simple Shear

Research papers, University of Canterbury Library

In 2010 and 2011 a series of earthquakes hit the central region of Canterbury, New Zealand, triggering widespread and damaging liquefaction in the area of Christchurch. Liquefaction occurred in natural clean sand deposits, but also in silty (fines-containing) sand deposits of fluvial origin. Comprehensive research efforts have been subsequently undertaken to identify key factors that influenced liquefaction triggering and severity of its manifestation. This research aims at evaluating the effects of fines content, fabric and layered structure on the cyclic undrained response of silty soils from Christchurch using Direct Simple Shear (DSS) tests. This poster outlines preliminary calibration and verification DSS tests performed on a clean sand to ensure reliability of testing procedures before these are applied to Christchurch soils.

PHYSICAL AND FUNCTIONAL PERFORMANCE OF THE TELECOMMUNICATION INFRASTRUCTUR…

Research papers, University of Canterbury Library

The operation of telecommunication networks is critical during business as usual times, and becomes most vital in post-disaster scenarios, when the services are most needed for restoring other critical lifelines, due to inherent interdependencies, and for supporting emergency and relief management tasks. In spite of the recognized critical importance, the assessment of the seismic performance for the telecommunication infrastructure appears to be underrepresented in the literature. The FP6 QuakeCoRE project “Performance of the Telecommunication Network during the Canterbury Earthquake Sequence” will provide a critical contribution to bridge this gap. Thanks to an unprecedented collaboration between national and international researchers and highly experienced asset managers from Chorus, data and evidences on the physical and functional performance of the telecommunication network after the Canterbury Earthquakes 2010-2011 have been collected and collated. The data will be processed and interpreted aiming to reveal fragilities and resilience of the telecommunication networks to seismic events

LINKING BUILDING PROPERTIES TO EARTHQUAKE-INDUCED DAMAGE AND BUSINESS DOWN…

Research papers, University of Canterbury Library

The 2010-2011 Canterbury earthquake sequence, and the resulting extensive data sets on damaged buildings that have been collected, provide a unique opportunity to exercise and evaluate previously published seismic performance assessment procedures. This poster provides an overview of the authors’ methodology to perform evaluations with two such assessment procedures, namely the P-58 guidelines and the REDi Rating System. P-58, produced by the Federal Emergency Management Agency (FEMA) in the United States, aims to facilitate risk assessment and decision-making by quantifying earthquake ground shaking, structural demands, component damage and resulting consequences in a logical framework. The REDi framework, developed by the engineering firm ARUP, aids stakeholders in implementing resilience-based earthquake design. Preliminary results from the evaluations are presented. These have the potential to provide insights on the ability of the assessment procedures to predict impacts using “real-world” data. However, further work remains to critically analyse these results and to broaden the scope of buildings studied and of impacts predicted.

Another Day and Another Deconstruction

Images, UC QuakeStudies

A digitally manipulated image of damaged buildings on St Asaph Street.

Crawling From the Wreckage

Images, UC QuakeStudies

A broken television lies among other debris.

Standing Strong

Images, UC QuakeStudies

Steel bracing on the Moorhouse Avenue overpass. The photographer comments, "Standing underneath I did hear a clump as if a part of the road overhead was pivoting as a car passed over it".

Images for Quake; more images...

Research papers, University of Canterbury Library

Research papers, University of Canterbury Library

Research papers, University of Canterbury Library

Research papers, University of Canterbury Library

Research papers, University of Canterbury Library

Images, UC QuakeStudies

Images, UC QuakeStudies

Images, UC QuakeStudies

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, UC QuakeStudies

Images, UC QuakeStudies

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, UC QuakeStudies

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010

Images, eqnz.chch.2010