2021 https://repo.nzsee.org.nz/xmlui/handle/nzsee/2322 2026-04-04T05:30:14Z 2026-04-04T05:30:14Z Deng, Tianhua Henry, Rick https://repo.nzsee.org.nz/xmlui/handle/nzsee/2434 2021-06-23T03:01:13Z 2021-04-14T00:00:00Z

Investigation of vertical reinforcement termination in lightly reinforced concrete walls Deng, Tianhua; Henry, Rick Reinforced concrete (RC) structural walls are effective lateral force-resisting components commonly implemented in tall buildings. Recent studies have investigated the impact of minimum vertical reinforcement limits on the ductility at the plastic hinge region of RC walls and resulted in revisions to design standard requirements in both New Zealand and the United States. These studies focused on cantilever walls with a single plastic hinge at the wall base, whereas tall buildings exhibit more distributed plasticity demands up the wall height. In addition, the termination rules for the vertical reinforcement in the plastic hinge region were not considered during previous tests and modelling. The main objective of this research is to investigate the seismic performance of RC walls in tall buildings, considering the influence of the vertical reinforcement contents up the full wall height. Push-over analyses were conducted on a 20-storey tall RC wall prototype, to investigate the sensitivity of the termination height of the vertical reinforcement in the plastic hinge. Based on the model results, current capacity design rules reviewed in NZS 3101:2006 may be insufficient to ensure that yielding is confined to the plastic hinge region. Preliminary recommendations are made regarding the termination height of additional vertical reinforcement within the plastic hinge.

2021-04-14T00:00:00Z Johnston, David Kaiser, Lucy Mestel, El Illsley-Kemp, Finnigan Tapuke, Kelvin Smith, Bubs Leonard, Graham Prasanna, Raj Tan, Marion Alger, Brandy Becker, Julia Campbell, Emily Stewart, Joshua https://repo.nzsee.org.nz/xmlui/handle/nzsee/2437 2021-07-09T05:11:21Z 2021-04-14T00:00:00Z

Improving earthquake resilience in the Taupō Volcanic Zone (TVZ) using school-based seismometers and connected education programmes Johnston, David; Kaiser, Lucy; Mestel, El; Illsley-Kemp, Finnigan; Tapuke, Kelvin; Smith, Bubs; Leonard, Graham; Prasanna, Raj; Tan, Marion; Alger, Brandy; Becker, Julia; Campbell, Emily; Stewart, Joshua Over the past decade several “seismometers in schools” programmes have been developed in Aotearoa New Zealand by a range of organisations, for a variety of reasons and aiming to achieve a range of educational outcomes. With the enhancement of digital seismic networks, the decreasing cost of sensors, cheaper and faster internet, and the increasing interest in “citizen science” a range of opportunities exist to further expand participation of school and other institutions in this space. This paper explores the recent development and deployment of a “seismometers in schools” programmes in Taupō Volcanic Zone (TVZ), as part of the ECLIPSE project (Eruption or Catastrophe: Learning to Implement Preparedness for future Supervolcano Eruptions) and discusses the challenges and opportunities for such programmes.

2021-04-14T00:00:00Z Zarinkamar, Shermineh Poshdar, Mani Wilkinson, Suzanne Quenneville, Pierre https://repo.nzsee.org.nz/xmlui/handle/nzsee/2435 2022-10-13T01:35:47Z 2021-04-14T00:00:00Z

The top enablers and barriers of seismic  technology adoption in construction Zarinkamar, Shermineh; Poshdar, Mani; Wilkinson, Suzanne; Quenneville, Pierre The slow process of adoption of the new technologies has been identified as a significant issue in the construction industry. In order to address this issue, the top enablers and barriers of the adoption process are needed to be identified. To do so, this paper conducts a series of twelve "systematising expert interview" with developers and users of four seismic-resistant technologies recently introduced to the New Zealand construction market. The four technologies included Resilient Slip Friction Joint (RSFJ), a seismic energy dissipator; Press-lam, a connector of timber beams and columns or columns and walls and their foundations; Sliding Hinge Joint (SHJ), a low damage joint for moment resisting steel frame; and Lead Extrusion Damper (LED); an extrusion-based metal damper. The collected responses were undergone a thematic analysis. The results indicated that the willingness of the consultancy group in involving the new technology, the spread of knowledge about the new technology, and the recommendations made by the structural designers as the top three enablers. Also, the client resistance to change, the complexity of design and construction required to incorporate the technology, and the place of supply were identified as the top three barriers of its adoption.

2021-04-14T00:00:00Z Gonzalez Espinel, Rosa Eva Stephens, Max Toma, Charlotte Elwood, Ken Dowdell, David https://repo.nzsee.org.nz/xmlui/handle/nzsee/2436 2022-10-13T01:43:52Z 2021-04-14T00:00:00Z

Quantifying the Embodied Carbon Cost from Demolitions Following the Canterbury Earthquakes Gonzalez Espinel, Rosa Eva; Stephens, Max; Toma, Charlotte; Elwood, Ken; Dowdell, David The 2010/2011 Canterbury Earthquake Sequence resulted in severe financial loss, loss of life and disruption in Christchurch due to liquefaction and damage from strong shaking, which led to the widespread displacement of people and business as well as a large number of building demolitions in the central business district. Several studies have since evaluated the prevailing factors which influenced demolition decision making, revealing that environmental impacts were not a direct consideration. To begin to make the case for incorporating environmental factors in designing buildings to resist earthquakes, this research is focused on identifying the environmental costs of demolishing buildings following earthquake damage using Christchurch as a case study. A building data set consisting of 142 RC (reinforced concrete) buildings that were demolished following the earthquake was used to quantify the environmental impacts of the decision making. The environmental impacts were broken into three distinct modules, (1) embodied CO2 and energy in the building materials, (2) impacts of the processes used in construction of the building, and (3) impacts of the transport and waste management processes. A material take-off model was used to estimate material quantities across the building set. First, a lifecycle assessment tool was used to calculate the impact on the first and second module. Second, the spatial distribution of the waste generation was defined to determine transportation distance. Finally, the impact of the demolition process, waste disposal and possible benefits of recycling are considered. The results revealed the demolitions had staggering impacts in terms of CO2 and energy.

2021-04-14T00:00:00Z