title: Innovative cold-formed steel nested tapered box section portal frames with bolted-side plate joints

authors: Paul, Bikram

abstract: Nested tapered box (NTB) portal frames made entirely of cold-formed steel (CFS) are widely used in New Zealand. Shahmohammadi (2019) recently described a full-scale test of such a system. The tested frame had a span of 18.16 meters and a height to the eaves of 4.27 meters. The joints of this NTB portal frame were rigid, constructed with bolted end plates. However, bolted end plate joints can be expensive due to the full penetration butt weld. This thesis proposes an alternative jointing system that uses bolted-side plates. The numerical work conducted in this study yields the following findings:
•	A shell finite element (FE) model was developed and validated using previously conducted full-scale portal frame tests. This validated model was then employed to compare the performance of bolted-side plate joints with bolted end-plate joints. The analysis revealed that a portal frame with 10 mm thick bolted side plates could sustain the same load as an NTB portal frame with bolted end-plate joints. Increasing the thickness of the bolted-side plates from 10 mm to 16 mm resulted in a 20% increase in load-carrying capacity. This improvement was due to the confinement effect provided by the side plates, which reduced the slenderness ratio near the eaves joint. However, the NTB portal frame with bolted-side plates exhibited greater apex displacement compared to the frame with bolted end-plate joints. 
•	FE models were developed for both the eaves and apex joints of the NTB portal frame.  A parametric study was then carried out involving 1,000 FE models. Using FE models, design equations are proposed for the moment capacities of the eaves and apex bolted side plates, accounting for both opening and closing moments under partial restraint.
•	A parametric study was conducted using the developed design method on eight models, considering a range of spans from 25m to 40m and eaves heights from 5.5m to 6.25m, with a consistent frame spacing of 7.5m. The results showed that portal frames with bolted-side plates can carry on average 7% more load compared to those with bolted end plate joints.
•	A methodology was presented to predict the load-carrying capacity of portal frames with back-to-back channel sections. It was shown that the predicted vertical loads from the proposed approach were, on average, within 1% (on an average) of the FEA results for portal frames. The same approach was applied to NTB portal frames through worked examples in Appendix B and C, demonstrating good accuracy.

text: Innovative cold-formed steel nested tapered box section portal frames with bolted-side plate joints Nested tapered box (NTB) portal frames made entirely of cold-formed steel (CFS) are widely used in New Zealand. Shahmohammadi (2019) recently described a full-scale test of such a system. The tested frame had a span of 18.16 meters and a height to the eaves of 4.27 meters. The joints of this NTB portal frame were rigid, constructed with bolted end plates. However, bolted end plate joints can be expensive due to the full penetration butt weld. This thesis proposes an alternative jointing system that uses bolted-side plates. The numerical work conducted in this study yields the following findings:
•	A shell finite element (FE) model was developed and validated using previously conducted full-scale portal frame tests. This validated model was then employed to compare the performance of bolted-side plate joints with bolted end-plate joints. The analysis revealed that a portal frame with 10 mm thick bolted side plates could sustain the same load as an NTB portal frame with bolted end-plate joints. Increasing the thickness of the bolted-side plates from 10 mm to 16 mm resulted in a 20% increase in load-carrying capacity. This improvement was due to the confinement effect provided by the side plates, which reduced the slenderness ratio near the eaves joint. However, the NTB portal frame with bolted-side plates exhibited greater apex displacement compared to the frame with bolted end-plate joints. 
•	FE models were developed for both the eaves and apex joints of the NTB portal frame.  A parametric study was then carried out involving 1,000 FE models. Using FE models, design equations are proposed for the moment capacities of the eaves and apex bolted side plates, accounting for both opening and closing moments under partial restraint.
•	A parametric study was conducted using the developed design method on eight models, considering a range of spans from 25m to 40m and eaves heights from 5.5m to 6.25m, with a consistent frame spacing of 7.5m. The results showed that portal frames with bolted-side plates can carry on average 7% more load compared to those with bolted end plate joints.
•	A methodology was presented to predict the load-carrying capacity of portal frames with back-to-back channel sections. It was shown that the predicted vertical loads from the proposed approach were, on average, within 1% (on an average) of the FEA results for portal frames. The same approach was applied to NTB portal frames through worked examples in Appendix B and C, demonstrating good accuracy.

year: 2025

title: Spontaneous Communities of Learning: Cooperative Learning Ecosystems Surrounding Virtual Worlds

authors: Galarneau, Lisa L.

subjects: online gamers

abstract: This thesis is the culmination of a five year research project exploring online gamers
and the cultures they engage with, both virtually in the many massively multiplayer
games and virtual worlds online, and in the physical spaces they inhabit in various
play spaces around the world. The primary research questions concerned social
learning in such spaces, i.e. how do players learn from one another what they need
to be successful, and what are the associated norms and practices for doing so?
What sorts of peripheral skills are gained, and are they applicable to physical world
contexts? Finally, what does participation in such spaces mean for individuals who
may have lacked other mechanisms for social learning, and what impacts might such
findings have on existing educational structures?
I anticipate that this thesis will generate as many questions as it will answer, and I
hope, that as a snapshot of a gaming culture in time, will be looked upon as a
monograph in the classic ethnographic tradition.

text: Spontaneous Communities of Learning: Cooperative Learning Ecosystems Surrounding Virtual Worlds This thesis is the culmination of a five year research project exploring online gamers
and the cultures they engage with, both virtually in the many massively multiplayer
games and virtual worlds online, and in the physical spaces they inhabit in various
play spaces around the world. The primary research questions concerned social
learning in such spaces, i.e. how do players learn from one another what they need
to be successful, and what are the associated norms and practices for doing so?
What sorts of peripheral skills are gained, and are they applicable to physical world
contexts? Finally, what does participation in such spaces mean for individuals who
may have lacked other mechanisms for social learning, and what impacts might such
findings have on existing educational structures?
I anticipate that this thesis will generate as many questions as it will answer, and I
hope, that as a snapshot of a gaming culture in time, will be looked upon as a
monograph in the classic ethnographic tradition.

year: 2010

title: An AR memory app based on Māori mnemonic aids

authors: Taia, Ivy

subjects: computer science

abstract: Traumatic Brain Injury (TBI) is a world-wide “silent epidemic” causing a variety of memory issues for those affected. Although several software approaches aim to aid memory recollection, they are inadequate for many TBI survivors and none address aspects of cultural awareness in New Zealand. We explored design concepts of traditional Māori cultural tools / techniques and how they helped Māori people recall past information. This paper describes our research and development of Maumahara Papahou, a mobile app that uses Augmented Reality features to create a digital memory treasure box based on the concepts of Māori mnemonic aids.

text: An AR memory app based on Māori mnemonic aids Traumatic Brain Injury (TBI) is a world-wide “silent epidemic” causing a variety of memory issues for those affected. Although several software approaches aim to aid memory recollection, they are inadequate for many TBI survivors and none address aspects of cultural awareness in New Zealand. We explored design concepts of traditional Māori cultural tools / techniques and how they helped Māori people recall past information. This paper describes our research and development of Maumahara Papahou, a mobile app that uses Augmented Reality features to create a digital memory treasure box based on the concepts of Māori mnemonic aids.

year: 2018