Invasive Seismic Testing – A Summary of Methods and Good Practice

In the aftermath of the 2010-2011 Canterbury and 2016 Kaikōura earthquakes, invasive seismic testing has become more commonly used in geotechnical earthquake engineering. However, several critical aspects of both data collection and data processing are not well understood by either the contractors collecting and processing the data or the geotechnical engineers using the data. read more

Interpretation of Internal Erosion Susceptibility in a New Zealand Canal Embankment

New Zealand has over 3,000 earth embankment dams and canals, many of which were constructed prior to the evolution of modern granular filter criteria for dam design in the mid-1980s. Tekapo Canal is one such structure, constructed from 1971 to 1977 as a 26 km long conveyance canal, linking two hydropower stations in the inland Canterbury region. Tekapo canal is constructed of widely-graded soils of glacial origin. Challenges with material compaction and constructability were reported during construction. read more

Seismic Performance of Diaphragms of Buildings – Determining the Lateral Earthquake Forces for Design of Diaphragms

This report outlines the findings of two independent studies by PTL Structural Consultants (PTL) and Holmes Consulting LP
(HCLP) which have validated the use of an earthquake induced lateral force distribution, develop by Dr D.
Gardiner (at University of Canterbury). The method for determining the lateral force distribution for
designing the diaphragms of buildings is known as “the pseudo-Equivalent Static Analysis (pESA)”. read more

Reconstructing Christchurch


International experts Dr. Michel Bruneau, Professor in the Department of Civil, Structural and Environmental Engineering at the University of Buffalo and Dr. Greg MacRae, Associate Professor in the Department of Civil and Natural resources Engineering at the University of Canterbury have collaborated on an extensive report on the factors underpinning  decisions  made in the rebuild of Christchurch after the Canterbury Earthquakes of 2010-2011. It is based on interviews with structural designers of up to 60% of the buildings design to date in the rebuild. read more

Review of New Zealand Pipe Inspection Manual

NZPIMThe New Zealand Pipe Inspection Manual (NZPIM) is a document that is extensively used by the water industry to assess the condition of waste and storm water pipes. It was last updated in 2006. Since that time, there have been a large number of technical advances. In addition, the NZ$100 million spent on inspecting the Christchurch 3 waters network after the Canterbury Earthquake Sequence provided a number of lessons that need to be captured in an update. As part of the Evidenced-based Decision Making for 3 Waters Networks project, the Quake Centre with the asistance of EQC engaged ProjectMax  to undertake a full review and scope of the required changes to the NZPIM. This exercise has now been completed and the report is out for comment across the water sector. read more

Compilation and analysis of a New Zealand Inventory of Dams

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Water-retaining dams form a vital part of New Zealand’s critical infrastructure, providing electricity, potable water and irrigation resources to a large proportion of the country. The damage or failure of these structures would incur a significant potential financial loss to the country; not only from the physical repair or rebuild cost, but also the potential for extended outages in power generation and/or municipal water services. read more