| id |
acadia20_114p |
| authors |
Zivkovic, Sasa; Havener, Brian; Battaglia, Christopher |
| year |
2020 |
| title |
Log Knot |
| source |
ACADIA 2020: Distributed Proximities / Volume II: Projects [Proceedings of the 40th Annual Conference of the Association of Computer Aided Design in Architecture (ACADIA) ISBN 978-0-578-95253-6]. Online and Global. 24-30 October 2020. edited by M. Yablonina, A. Marcus, S. Doyle, M. del Campo, V. Ago, B. Slocum. 114-119. |
| summary |
Log Knot, developed by the Robotic Construction Laboratory (RCL) at Cornell University, is a robotically fabricated architectural installation that establishes a method for variable compound timber curvature creation utilizing both regular and irregular roundwood geometries. Moreover, the project develops methods for minimal formwork assembly and moment force optimization of customized mortise and tenon joints. Following the logic of a figure-8 knot, the project consists of an infinite loop of roundwood, curving three-dimensionally along its length. There are a variety of techniques to generate single curvature in wood structures such as steam bending (Wright et al., 2013) or glue lamination (Issa and Kmeid, 2005) but only a few techniques to generate complex curvature from raw material within a single wooden structural element exist. To construct complex curvature, the research team developed a simple method that can easily be replicated. First, the log is compartmentalized, establishing a series of discrete parts. Second, the parts are reconfigured into a complex curvature whole by carefully manipulating the assembly angles and joints between the logs. Timber components reconfigured in such a manner can either follow planar curvature profiles or spatial compound curvature profiles. Based on knowledge gained from the initial joinery tests, the research team developed a custom tri-fold mortise and tenon joint, which is self-supportive during assembly and able to resist bending in multiple directions. Using the tri-fold mortise and tenon joint, a number of full-scale prototypes were created to test the structural capacity of the overall assembly. Various structural optimization protocols are deployed in the Log Knot project. While the global knot form is derived from spatial considerations albeit within the structurally sound framework of a closed-loop knot structure the project is structurally optimized at a local level, closely calibrating structural cross-sections, joinery details, and joint rotation in relation to prevailing load conditions. |
| series |
ACADIA |
| type |
project |
| email |
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| full text |
 file.pdf (7,411,422 bytes) |
| references |
Content-type: text/plain
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Aagaard, Anders Kruse, and Niels Martin Larsen (2019)
 Exploring natural wood: A workflow for using non-uniform sawlogs in digital design and fabrication
, ACADIA 19: Ubiquity and Autonomy Proceedings of the 39th Annual Conference of the Association for Computer Aided Design in Architecture, ed. Kory Bieg, Clay Odom. Austin, Texas, USA: ACADIA
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Issa, Camille A., and Ziad Kmeid (2005)
Advanced wood engi-neering: glulam beams
, Construction and Building Materials 19 (2): 99-106
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MacDonald, Katie, Kyle Schumann, Jonas Hauptman (2019)
Digital Fabrication of Standardless Materials
, ACADIA 19: Ubiquity and Autonomy Proceedings of the 39th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA), ed. Kory Bieg, Clay Odom. Austin, Texas, USA: ACADIA
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Mollica, Zachary, and Martin Self (2016)
Tree Fork Truss
, Advances in architectural geometry 2016, ed. S. Adriaenssens, F. Gramazio, M. Kohler, A. Menges, M. Pauly, 138-153. Zurich: ETH
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Self, Martin (2016)
Hooke Park: application for timber in its Natural Form
, Advancing Wood Architecture: A Computational Approach, ed. A. Menges, T. Schwinn, O.D. Krieg. Milton Park: Routledge
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Von Buelow, Peter, Omid Oliyan Torghabehi, Steven Mankouche, and Kasey Vliet (2018)
Combining parametric form generation and design exploration to produce a wooden reticulated shell using natural tree crotches
, Proceedings of IASS Annual Symposia, vol. 2018, ed. J. Ochsendorf, C. Mueller, W. Baker, S. Adriaenssens, J. Abel, 1-8. Boston: IASS
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Wright, Robert S., Brian H. Bond, and Zhangjing Chen (2013)
Steam bending of wood; Embellishments to an ancient technique
, BioResources 8 (4): 4793-4796
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| last changed |
2021/10/26 08:03 |
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