Rotational Stiffness at Ridges of Timber Folded-plate Structures

Roche, Stéphane; Mattoni, Geoffroy; Weinand, Yves

doi:10.2749/222137815815775187

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…While the 1-DOF property is also provided by open-slot dovetail joints, through-tenon joints provide additional features for the transfer of forces. The bending strength of different types of multiple-tab-and-slot plate joints (MTSJ) has been compared by Roche et al, 8 demonstrating that joints with a closed slot, also called through-tenon joints, combine the high shear strength of finger- and dovetail joints 9 with a high bending strength.…”

Section: Construction Systemmentioning

confidence: 99%

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Double-layered timber plate shell

Robeller

Konaković

Dedijer

et al. 2017

International Journal of Space Structures

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This article presents a new lightweight construction system for doubly curved shells made from timber plates, inspired by the masonry vaults of Eladio Dieste. The system was developed for a specific case-study project, and general applications to other freeform surfaces are being discussed. The shells are built from two interconnected layers of structural wood veneer plates, using integral through-tenon joints for a fast, precise, and simple assembly. This allows for the construction of a series of differently shaped vaults without a costly mold or support structure. Instead, inclined joints cut with a 5-axis computer numerical controlled milling machine embed the correct location and angle between plates into the shape of the parts. This constrains the relative motions between joined parts to one assembly path. To take advantage of the benefits of such connectors, the constrained assembly paths must be considered in the fundamental design of the system, allowing for the insertion of each plate. This imposes additional constraints in the segmentation process of doubly curved shells. In order to meet the requirements and resolve the multi-constraint system, we use a global, nonlinear optimization approach. Developed as a close collaboration between architects, computer scientists and structural engineers, this article includes an experimental analysis of the influence of parametric modifications in the shape of connectors on their load-bearing performance.

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Section: Construction Systemmentioning

confidence: 99%

“…This simplified the handling, transport, and final assembly of the shell. The mechanical strength of the joints, which has been examined separately by Roche and colleagues, 8–10 was studied without the use of adhesives.…”

Section: × 16 Segment Shell Prototypementioning

confidence: 99%

Double-layered timber plate shell

Robeller

Konaković

Dedijer

et al. 2017

International Journal of Space Structures

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View full text Add to dashboard Cite

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“…as well as the three-dimensional subset of feasible inser-113 tion vectors [7]. Their load bearing capacity, i.e.…”

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confidence: 99%

Experimental investigation of the influence of integral mechanical attachments on structural behaviour of timber folded surface structures

Stitic

Robeller

Weinand

2018

Thin-Walled Structures

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Structural behaviour of timber folded surface systems greatly depends on the connections ability to transfer the occurring forces between the adjacent elements and finally to the supports. This paper focuses on multiple tab-and-slot joints (MTSJ), where digital prefabrication is used to integrate connectors through plate geometry. Multiple plates assembled within a large scale folded surface structure were tested to examine the influence of connection detail type on its global structural behaviour. For this purpose an innovative test setup was devised that approximates uniformly distributed surface load. The connection details used were chosen with respect to preliminary small scale bending tests. Three groups of distinct large scale structures were tested: 1) structures with miter joint detail and adhesive applied along the edges; 2) structures with open slot MTSJ; and 3) structures with closed slot MTSJ. Extensive investigation into the load bearing behaviour and failure propagation for each of the three different types of structures has been conducted.For analysing their feasibility, the tested structures were also reviewed in terms of fabrication time, assembly and on-site construction. The obtained results show that even though adhesively joined structures provide highest structural stiffness, they exhibit multiple disadvantages when considering building scale applications. Open slot MTSJ structures results indicate that these joints cannot provide sufficiently reliable structural behaviour. Structures with MTSJ closed slots show that their joint geometry greatly improves both the ultimate load-bearing capacity as well as stiffness. Furthermore, by transferring the edge occurring forces mainly in compression, they provide additional ductility to the global system. Within the scope of this paper, closed slot MTSJ proved to be a very efficient connection type which can constitute a robust folded structural system made as a multiple assembly of thin timber plates.

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Fabrication-Aware Design of Timber Folded Plate Shells with Double Through Tenon Joints

Robeller¹,

Weinand²

2016

Robotic Fabrication in Architecture, Art and Design 2016

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Integral attachment, the joining of parts through their form rather than additional connectors or adhesives, is a common technique in many industry sectors. Following a renaissance of integral joints for timber frame structures, recent research investigates techniques for the attachment of timber plate structures. This paper introduces double through tenon joints, which allow for the rapid, precise and fully integral assembly of doubly-curved folded surface structures with two interconnected layers of cross-laminated engineered wood panels. The shape of the plates and the assembly sequence allow for an attachment without additional connectors or adhesives. The fabrication and assembly constraint based design is achieved through algorithms, which automatically generate the geometry of the parts and the G-Code for the fabrication. We present the fabrication and assembly of prototypes fabricated with 3D CNC milling and laser cutting systems, comparing and discussing the advantages and disadvantages of the individual techniques.

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Rotational Stiffness at Ridges of Timber Folded-plate Structures

Cited by 4 publications

References 6 publications

Double-layered timber plate shell

Double-layered timber plate shell

Experimental investigation of the influence of integral mechanical attachments on structural behaviour of timber folded surface structures

Fabrication-Aware Design of Timber Folded Plate Shells with Double Through Tenon Joints

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