Figure 1 - uploaded by Julien Gamerro
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7 -View of a prefabricated roof element made with laminated-veneer lumber by the company Metsä Wood: Kerto Ripa ® .
Source publication
Traditional wood-wood connections, widely used in the past, have been progressively replaced by steel fasteners and bonding processes in modern timber constructions. However, the emergence of digital fabrication and innovative engineered timber products have offered new design possibilities for wood-wood connections. The design-to-production workfl...
Context in source publication
Context 1
... TT joint length was 50 mm for each sample and only the spacing between joints was variable (one configuration with a spacing of 100 mm). An insertion angle α t 1 of 1˚was1˚was introduced for all the samples. The fiber orientation (FO) of OSB panels was parallel to the element length, except for the inner layer of flanges (first layer according to Fig. 3.17a). The notch diameter was equal to 13 mm for all samples. Configurations were defined in collaboration with the industrial partner according to manufacturing and supply possibilities. Samples were tested using a push-out test configuration as shown in Fig. 3.18a. A 300 kN hydraulic jack (model SEV-16071000, Schalcher Engineering GmbH, ...
Citations
... Regarding the parameters associated with the geometry of the mortises and the tenons, a length of 100 mm and a minimum distance of 50 mm from the edge of the board have been set for all joints. This follows the design guidelines provided by Gamerro et al. for orthogonal timber slabs connected by mortise and tenon joints (Gamerro 2020). Therefore, the remaining variable parameters of the experimental campaign were the offset, the angle, the number of joints, and the size of the chamfer. ...
This research investigates the robotic assembly of timber structures connected by wood–wood connections. As the digitization of the timber construction sector progresses, digital tools, such as industrial robotic arms and Computer Numerical Control machines, are becoming increasingly accessible. The new-found ease with which wood can be processed stimulates a renewed interest in traditional joinery, where pieces are simply interlocked instead of being connected by additional metallic parts. Previous research established a computational workflow for the robotic assembly of timber plate structures connected by wood–wood connections. This paper focuses on determining the physical conditions that allow inserting through-tenon joints with a robot. The main challenge lies in minimizing the clearance between the tenon and the mortise in order to keep the connections as tight as possible. An experimental protocol has, therefore, been developed to quantitatively assess the performance of the insertion according to different geometric parameters. Robotic insertion tests have been carried out on over 50 samples of 39 mm Laminated Veneer Lumber. Results showed the interest of tapering the joint with a 5 degrees angle, in addition to introducing an offset of 0.05 mm, to minimize friction forces during the insertion. This configuration was confirmed by successfully assembling a 2,50 m long box girder with the same parameters.
... The use of digital fabrication techniques, in particular the automation of machinery tools such as computer numerical control (CNC) machines along with computeraided design and manufacturing, have made the use of wood-wood connections competitive for modern timber structures. Therefore, a standardized timber construction system using wood-wood connections has recently been developed for basic building components [1,2]. This system consists of commonly available supplier-sized panels of 1.25 by 2.5 m which are connected exclusively by digitally produced through-tenon (TT) connections to reconstitute larger span up to 10 m (see Figure 1). ...
With the increasing use of automation and computer-aided manufacturing in timber construction, a standardized timber construction system using digitally produced wood-wood connections has recently been developed for basic building components. Its structural performance has already been characterized with static bending tests in a previous case-study. Based on this work, the creep behavior of such a construction system is investigated in this paper. An experimental test was conducted in outdoor conditions to perform a simple quantitative and comparative study with the creep-reduction factor k de f for wood-wood connections described in the Eurocode 5 standard. A large-scale specimen was placed on two supports under a ventilated shelter and exposed to natural variations of humidity and temperature over a total period of approximately 400 days. The results were reassuring for the long-term performance of this type of construction system. Creep due to the connections accounted for 25% of the final displacement. In addition, the existing guidelines concerning the factor k de f for wood-wood connections were conservative for this specific configuration and could be optimized with future investigations on this topic.
