Time filter

Source Type

Auckland, New Zealand

Elwood K.J.,University of Auckland | Pampanin S.,University of Canterbury | Kam W.Y.,BECA | Priestley N.,University of California at San Diego
Geotechnical, Geological and Earthquake Engineering

At 12:51 pm local time on 22 February 2011, a Mw 6.2 aftershock of the September 4, 2010, Darfield Earthquake shook the city of Christchurch, New Zealand. The aftershock occurred on an unmapped fault less than 8 km from the city center resulting in the collapse of two reinforced concrete office buildings and one concrete parking garage, and severe damage to numerous others. The region has continued to suffer from aftershocks and further damage to building structures throughout the year following the February earthquake. This paper summarizes the observed damage to buildings in the Central Business District (CBD), with a specific focus on identifying future research to support the development of performance-based design procedures. © Springer Science+Business Media Dordrecht 2014. Source

Sparrow M.,Parsons Brinckerhoff | Tucker S.,BECA | Hobson A.,Parsons Brinckerhoff
14th Australasian Tunnelling Conference 2011: Development of Underground Space, Proceedings

The Victoria Park Tunnel project is an inner-city alliance project in central Auckland, New Zealand. The existing two-directional viaduct will be modified to single-direction flow, and a new northbound 440 m cut and cover tunnel will be constructed beneath Victoria Park. Three-dimensional (3D) visualisation media were used to communicate key design innovations to stakeholders and the general public. The 3D visual material has proven a useful tool for informing motorists of a new safety barrier method adopted for traffic management. This presentation will explain how 3D visualisation was incorporated in the project and will showcase the 3D visualisation media created for the project. Source

Sims C.,BECA | Orwin J.F.,University of Otago
Journal of Hydrology New Zealand

Sustained summer snow melt from higher elevation catchments can be a significant source of runoff, particularly in regions with low summer rainfall. Little is known, however, about the timing and generation of snowmelt on the dry, fault-block mountains of Central Otago, New Zealand, where snowmelt is an important component of the water balance. To address this issue, meteorological, snow and runoff variables were measured in a 0.3 km2 tributary of the Leopold Burn on the Pisa Range, which is typical of the mountains of this region. Results of a point energy balance calculated for a mid-elevation site showed that the energy available for melt was primarily driven by net radiation. On average, net radiation provided 40% of the total energy available for melt, with the sensible heat flux contributing, on average, 34%. The estimated total water output over the 28 days of snowmelt was 746.59 mm water equivalent. The stage record from the catchment suggests that the melt period in this region is characterized by a single, sustained pulse of meltwater with a steep rising limb and subsequent decline. This hydrological response reflects an efficient response to positive energy inputs with, in this case, the complete removal of snow cover from the catchment in less than a month. This runoff response, coupled with a generally thin snowpack as a result of the medium elevation of the fault-block mountains, suggests that summer river flows in Central Otago could be particularly responsive to any long-term changes in winter precipitation patterns. © New Zealand Hydrological Society (2011). Source

Claridge E.,BECA | Spearpoint M.,University of Canterbury
Procedia Engineering

New Zealand's Building Code has recently been amended and has introduced a new clause specific to fire-fighting operations that requires, amongst other things, that buildings must be designed and constructed to allow fire-fighters to reach the floor of fire origin and search the general area. The Code also specifies that for certain buildings they must be designed and constructed to allow fire-fighters to be able to first apply water to the fire before specified tenability criteria have been exceeded. These new requirements and other established performance-based fire engineering methods require the times associated with various fire brigade intervention tasks and specifically arrival times to be quantified. Currently there is limited data available to allow specific calculation of fire service response times to buildings. This paper presents response time and travel speed distributions to enable calculation of the time taken for the fire service to respond to notification of a fire and arrive at a specific location. Comparisons between response times within urban and rural fire districts are presented and between three of New Zealand's largest cities, their central business districts and outer suburbs. Distributions are presented and compared to existing values suggested by the Fire Brigade Intervention Model with data given to allow the assessment of the probability of attendance. © 2013 International Association for Fire Safety Science. Source

Henville C.F.,Henville Consulting Inc. | Ward K.M.,BECA
2012 IEEE International Conference on Power System Technology, POWERCON 2012

Addition of series compensation to transmission lines will increase the power transfer capabilities of the lines. However the existing transmission line protection systems on both the compensated lines and nearby uncompensated lines can be significantly affected. The security of the protection on the adjacent lines can be compromised and both the security and the dependability of the protection on the compensated line can also be threatened. When compensation is being considered for existing lines to increase their transfer capacity, the lowest cost solution would be to retain the existing protection systems with minimum modifications. This paper describes two studies that were completed to identify the minimum upgrade work required to ensure reliable protection applications and settings considering the impact of proposed series compensation projects. © 2012 IEEE. Source

Discover hidden collaborations