Research PaperNo Access

Structural Behavior of Digitally Fabricated Thin-Walled Timber Columns

Yousef Alqaryouti

School of Civil Engineering, The University of Queensland, St. Lucia, QLD 4072, Australia

E-mail Address: [email protected]

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Dilum Fernando

School of Civil Engineering, The University of Queensland, St. Lucia, QLD 4072, Australia

E-mail Address: [email protected]

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, and

Joseph Gattas

School of Civil Engineering, The University of Queensland, St. Lucia, QLD 4072, Australia

E-mail Address: [email protected]

Corresponding author.

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https://doi.org/10.1142/S0219455419501268Cited by:3 (Source: Crossref)

Abstract

This paper aims to investigate the structural behavior of digitally fabricated thin-walled timber sections with edge connectivity provided by integral mechanical press-fit joints. Experimental, numerical, and analytical investigations have been developed to accurately characterize the press-fit section behavior and their failure modes. Plywood fiber orientation, material thickness, and connection tightness are considered as potential factors that may affect the performance of the press-fit jointing system. Experimental testing of square hollow sections (SHSs) under uniaxial compressive loading showed failure of sections through both conventional crushing and novel pop-off bifurcation failures. Pop-off buckling behaviors were shown to be governed by the integral joint transverse stiffness and its magnitude relative to a critical edge stiffness value. Columns with joint transverse stiffness value less than the critical edge stiffness value exhibited pop-off failures. These joint stiffness values were obtained from testing of unloaded joints and were used to obtain accurate predictions of column failure modes. Joint stiffness values for loaded joints were then predicted with an interpolation model mapping axial strain to a tighter connection tolerance and these were used to obtain accurate estimations for column failure load in most of the tested column types. Comparative investigations showed thin-walled sections with integral joints only to be capable of matching the compressive capacities of glued sections, for instances where crushing governed. Similarly, the weight-specific compressive capacity of timber sections was found to be comparable to thin-walled steel sections when crushing governs.

Keywords:

References

1. E. Lloret Kristensen, A. R. Shahab, M. Linus, R. J. Flatt, F. Gramazio, M. Kohler and S. Langenberg , Complex concrete structures: Merging existing casting techniques with digital fabrication, Comput.-Aided Des. 60 (2015) 40–49. Crossref, Web of Science, Google Scholar
2. L. Iwamoto , Digital Fabrications: Architectural and Material Techniques, 1st edn. (Princeton Architectural Press, 2009). Google Scholar
3. B. Kolarevic , Digital fabrication: Manufacturing architecture in the information age, in Proc. ACADIA 2001: Reinventing the Discourse, eds. W. Jabi (2001), pp. 268–277. Crossref, Google Scholar
4. L. Iwamoto , Digital Fabrications: Architectural and Material Techniques, 2nd edn. (Princeton Architectural Press, 2013). Google Scholar
5. F. Gramazio and M. Kohler , Digital Materiality in Architecture (Lars Müller Publishers, Baden, 2008). Google Scholar
6. C. Robeller, Y. Weinand, V. Helm, A. Thoma, F. Gramazio and M. Kohler , Robotic integral attachment, in Proc. Fabricate 2017 Conf., eds. A. Menges, B. Sheil, R. Glynn and M. Skavara (UCL Press, London, 2017), pp. 92–97. Crossref, Google Scholar
7. S. Genc, R. W. Messler and G. A. Gabriele , A systematic approach to integral snap-fit attachment design, Res. Eng. Des. 10(2) (1998) 84–93. Crossref, Web of Science, Google Scholar
8. L. Sass, Mega assembly: Scaling and decomposition of digital designs (2013), http://cba.mit.edu/events/13.03.scifab/Sass.pdf. Google Scholar
9. Y. Al-Qaryouti, Y. Wen, F. Dilum and J. Gattas , Comparison of plate and shell timber-composite sandwich structures, in Proc. 2017 Annu. Symp. International Association for Shell and Spatial Structures Interfaces: Architecture, Engineering, Science (HafenCity University, Hamburg, 2017). Google Scholar
10. R. L. Magna, M. Gabler, S. Reichert, T. Schwinn, F. Waimer, A. Menges and J. Knippers , From nature to fabrication: Biomimetic design principles for the production of complex spatial structures, Int. J. Space Struct. 28(1) (2013) 27–39. Crossref, Google Scholar
11. C. Robeller, A. Stitic, P. Mayencourt and Y. Weinand , Interlocking folded plate: Integrated mechanical attachment for structural wood panels, in Advances in Architectural Geometry 2014 (Springer, 2015), pp. 281–294. Crossref, Google Scholar
12. C. Robeller, M. Konakovic, M. Dedijer, M. Pauly and Y. Weinand , A double-layered timber plate shell-computational methods for assembly, prefabrication, and structural design, in Advances in Architectural Geometry 2016 (vdf Hochschulverlag AG, 2016), pp. 104–122. Google Scholar
13. C. Robeller and Y. Weinand , A 3D cutting method for integral 1DOF multiple-tab-and-slot joints for timber plates, using 5-axis CNC cutting technology, in Proc. World Conf. Timber Engineering (WCTE 2016) (2016). https://infoscience.epfl.ch/record/222484/files/WCTE2016_Robeller.pdf. Google Scholar
14. J. M. Gattas, Y. Al-Qaryouti, T.-U. Lee and K. Baber , Rapid assembly with bending-stabilised structures, in Proc. FABRICATE 2017 Conf. (UCL Press, 2017), pp. 50–57. Crossref, Google Scholar
15. L. Sass and M. Botha , The instant house: A model of design production with digital fabrication, Int. J. Archit. Comput. 4(4) (2006) 109–123. Crossref, Google Scholar
16. J. Gattas and Z. You , Design and digital fabrication of folded sandwich structures, Autom. Constr. 63 (2016) 79–87. Crossref, Web of Science, Google Scholar
17. D. Albright, V. Bloutin, D. Harding, U. Heine and D. Pastre , Sim[PLY]: Rapid structural assemblies using CNC-fabricated plywood components, Int. J. Comput. Methods Exp. Meas. 5(4) (2017) 532–538. Google Scholar
18. A. Parvin and E. O’Neil , Open source WikiHouse disrupts traditional design, Carnegie Council: Policy Innov. 3(5) (2012) 23–30. http://www.policyinnovations.org/ideas/innovations/data/000216. Google Scholar
19. G. Lidija, Facit Homes’ D-process creates buildings that snap together like LEGO bricks (2015), Inhabitat, http://inhabitat.com/facit-homes-d-process-creates-efficient-buildings-that-snap-together-like-lego-bricks/. Google Scholar
20. C. Robeller, P. Mayencourt and Y. Weinand , Snap-fit joints-CNC fabricated, integrated mechanical attachment for structural wood panels, in ACADIA 2014 Design Agency: Proc. 34th Annu. Conf. Association for Computer Aided Design in Architecture (Riverside Architectural Press, 2014). Crossref, Google Scholar
21. P. Eversmann, F. Gramazio and M. Kohler , Robotic prefabrication of timber structures: Towards automated large-scale spatial assembly, Constr. Robot. 1(1–4) (2017) 49–60. Crossref, Google Scholar
22. I. Smith and M. A. Snow , Timber: An ancient construction material with a bright future, Forest. Chron. 84(4) (2008) 504–510. Crossref, Web of Science, Google Scholar
23. M. Lawson, R. Ogden and C. Goodier , Design in Modular Construction (CRC Press, 2014). Crossref, Google Scholar
24. R. Y. M. Li and H. Du , Sustainable construction waste management in Australia: A motivation perspective, in Construction Safety and Waste Management (Springer, 2015), pp. 1–30. Crossref, Google Scholar
25. C. Loss, M. Piazza and R. Zandonini , Connections for steel–timber hybrid prefabricated buildings — Part II: Innovative modular structures, Constr. Build. Mater. 122 (2016) 796–808. Crossref, Web of Science, Google Scholar
26. M. Dedijer, S. N. Roche and Y. Weinand , Shear resistance and failure modes of edgewise multiple tab-and-slot joint (MTSJ) connection with dovetail design for thin LVL spruce plywood Kerto-Q panels, in Proc. World Conf. Timber Engineering (2016). Google Scholar
27. J. Gamerro, I. Lemaıtre and Y. Weinand , Mechanical characterization of timber structural elements using integral mechanical attachments, in Proc. World Conf. Timber Engineering (WCTE 2018) (2018). Google Scholar
28. A. C. Nguyen and Y. Weinand , Development of a spring model for the structural analysis of a double-layered timber plate structure with through-tenon joints, in Proc. World Conf. Timber Engineering (WCTE 2018) (2018). Google Scholar
29. J. T. Christensen, M. F. Christensen and L. Damkilde , Architectural and structural qualities in timber joints: An attempt to establish a methodology for early conceptual design studies, in Proc. World Conf. Timber Engineering (2016). Google Scholar
30. M. E. Wagner, Structural connections in plywood friction-fit construction, Bachelor’s thesis, Massachusetts Institute of Technology (2014). Google Scholar
31. S. Roche, C. Robeller, L. Humbert and Y. Weinand , On the semi-rigidity of dovetail joint for the joinery of LVL panels, Eur. J. Wood Wood Prod. 73(5) (2015) 667–675. Crossref, Web of Science, Google Scholar
32. A. Stitic, C. Robeller and Y. Weinand , Experimental investigation of the influence of integral mechanical attachments on structural behaviour of timber folded surface structures, Thin-Walled Struct. 122 (2018) 314–328. Crossref, Web of Science, Google Scholar
33. J. Gattas, Digital fabrication toolbox (2014), http://joegattas.com/digital-fabrication/. Google Scholar
34. R. M. Jones , Mechanics of Composite Materials, 2nd edn. (Taylor & Francis, Philadelphia, 1999). Google Scholar
35. S. S. Nabaei and Y. Weinand , Geometrical description and structural analysis of a modular timber structure, Int. J. Space Struct. 26(4) (2011) 321–330. Crossref, Google Scholar
36. C. Miao, Fibre reinforced polymer-timber veneer composite, unpublished thesis, The University of Queensland (2019). Google Scholar
37. A. W. Leissa, Buckling of laminated composite plates and shell panels, Technical Report No. AFWAL-TR-85-3069, Flight Dynamics Laboratory, Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, Ohio (1985). Google Scholar
38. J. N. Reddy , Mechanics of Laminated Composite Plates and Shells: Theory and Analysis (CRC Press, 2004). Crossref, Google Scholar
39. AustubeMills, Design capacity tables for structural steel hollow sections (2013), Report, https://www.libertygfg.com/media/164047/design-capacity-tables-for-structural-steel-hollow-sections.pdf. Google Scholar
40. Australian Tube Mills, Ecoply specification & installation guide, Document (2015). Google Scholar
41. Earlybird Steel, RHS square: Gal. grade AS1163-c350 prices (2019), https://earlybirdsteel.com.au/rhs/rhs-square-galvanised. Google Scholar