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Research Report 058 Seismic assessment of New Zealand highway bridges: development and testing of preliminary screening procedures

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

A preliminary screening procedure for the prioritisation of New Zealand State Highway bridges is presented. The procedure is designed to identify bridges which justify detailed assessment of their earthquake resistance.

Research Report 077 Seismic evaluation and retrofit technology for bridges

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

Despite recent progress by the structural engineering profession in addressing bridge seismic risks, several areas exist where improvements in bridge evaluation and retrofit practices are needed. This report reviews the common seismic deficiencies of bridges, procedures and criteria for the seismic evaluation of bridges, and the engineering techniques which have been used, up to 1996, for retrofitting bridge seismic deficiencies. Information on seismic deficiencies, retrofit techniques, and related research has been summarised in tabular form.

Research Report 078 Seismic testing and behaviour of a 1936-designed reinforced-concrete bridge

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

The laboratory testing and inelastic computer analysis are described for a 1936-designed bridge which is typical of many of the older, reinforced-concrete, multi-span bridges in New Zealand. The structure has plain-round (undeformed) reinforcing bars and anchorage details, shear strength, and column-transverse reinforcement that are potentially deficient. Despite the suspected seismic deficiencies, the testing and analysis of the bridge show that its seismic performance will be good.

Research Report 134 Risk assessment techniques for optimising slope-failure preventative maintenance programmes

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

A North American method for establishing an optimised slope-failure preventive maintenance programme for use by roading authorities has been identified and trialed by way of a case study, to determine its application to New Zealand roads.

Research Report 135 A risk assessment procedure for optimising slope-failure preventative maintenance programmes

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

A methodology has been developed, based on a study carried out in 1998–99, to assist in selecting optimum slope-failure preventive maintenance programmes for highways. The existing risk to road users from slope instability is first quantified, then the effectiveness of maintenance programmes in reducing the risk to road users is determined and the mitigated risks quantified. The risks are expressed in economic terms and the implementation costs associated with each programme are incorporated into the analysis. The technique allows for the consideration of uncertainty in various input parameters (both geotechnical and economic). Monte Carlo simulation allows analysis outputs to be expressed in terms of probability distributions. The uncertainty associated with the analysis outcome may therefore be quantified, leading to better informed decision-making and prioritisation of expenditure. A Microsoft Excel 97 file has been developed to allow the technique to be applied to a range of slope stability situations.

Research Report 147 Security of New Zealand's strategic roading system

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

The reliable operation of New Zealand's road network is critical to both its economic success and its social development. Disruption to some parts of the network may therefore have a large negative impact on these.

Research Report 148 Risk assessment methods in road network evaluation

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

This study, carried out in 1998, investigates hazards that have the potential to close the Desert Road, which traverses for some 60 km the Central Volcanic Plateau of the North Island, New Zealand, at around 1000 m altitude. It is part of New Zealand's major north-south link, State Highway 1, and it provides a case study for the application of risk assessment methodology to the evaluation of road networks in New Zealand.

Research Report 159 The effect of link reliability on benefit/cost ratios

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

This report develops project evaluation procedures to incorporate risk assessment of road link reliabilities. The current Transfund evaluation procedures and recent work in this area are reviewed and suggested directions discussed. Simple link reliabiity theory is then developed, as well as typical examples of how this theory could be applied. The application of this theory within a project evaluation context is also considered.

Research Report 208 Progressive underslip stabilisation using gravel columns

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

This report presents the findings of the monitoring programme undertaken by GHD at Snake Hill (SH1 RP 144/11.34), a road slip site which was stabilised using graded gravel column drains.

Research Report 217 Natural hazard risk management for road networks: Part I: risk management strategies

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

Road networks are lifelines for the community and are essential for the economic well-being of New Zealand. Significant natural hazard events can also cause widespread disruption to transportation, leading to significant repair costs to road controlling authorities, access difficulties for emergency services, and disruption to road users, tourists and the community at large.
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