Experimental investigations on the load-carrying capacity of digitally produced wood-wood connections

Gamerro, Julien; Bocquet, Jean François; Weinand, Yves

doi:10.1016/j.engstruct.2020.110576

Cited by 17 publications

(3 citation statements)

References 16 publications

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“…Traditional wooden fasteners are uncompetitive due to their high skill requirement and labour costs, but today, with the assistance of emerging digital fabrication and computernumerical-controlled (CNC) machinery, it is possible to apply traditional wooden fasteners as a cost-competitive alternative to adhesives and metal fasteners for joining modern structures [130,131]. The European DoMWoB project investigated the development of dovetailed wooden panel (Figure 18) for multi-story buildings as a replacement for conventional EWPs [132], involving the design, manufacture, testing (fire resistance, airborne sound insulation, four-point bending, humidity behaviour and air-tightness), and market analysis for dovetailed wooden panels [133,134].…”

Section: Dovetailed Panelsmentioning

confidence: 99%

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Han

Kutnar

Sandak

et al. 2023

Forests

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Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes.

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Section: Dovetailed Panelsmentioning

confidence: 99%

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Han

Kutnar

Sandak

et al. 2023

Forests

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“…Squared and round timber processed using CNC machines (Bucklin et al, 2021;Colella, 2020) are used for walls of arbitrary curvilinear shapes. Digitally produced mortise and tenon joints are currently under investigation (Gamerro et al, 2020). Such inventions are not yet widely used in wooden buildings due to the complexity of the manufacturing process and the low number of wooden buildings of curvilinear configurations.…”

Section: Introductionmentioning

confidence: 99%

Method of Calculation for Walls of Vertical Squared Timber

Tretiakova

2022

AEJ

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Introduction: In recent years, houses out of vertical squared timber have become widespread. Vertical bars make it possible to use the effective wood behavior in compression and ensure maximum strength of the material along the fibers. Vertical bars are subject to compression with bending, which can result in loss of strength and buckling in building structures. In the available research papers and technical literature, the issue of the stress-strain state of such walls has not been analyzed. The purpose of this study was to formulate a calculation method for walls out of vertical squared timber, based on the available traditional approaches to wooden structures. We propose a calculation method for walls out of vertical squared timber as a set of elements resisting compression with bending, including a check for limiting slenderness. Results: Permissible heights of walls for buildings with bays of 10 and 12 m were obtained. The results can be used in the design of low-rise residential and public buildings, mansard superstructures of multi-story buildings.

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“…Three main parameters affecting the performance were identified: material type, timber fiber orientation, and tab insertion angle. Further tests were performed by (Gamerro et al 2020), who concluded that the equations provided by Eurocode 5 (Comite Europeen de 2004) generally underestimates the load-carrying capacity of such connections by 25% (except when made from oriented strand board timber). Numerical models were also developed to simulate the joint behaviour, as proposed by Nguyen and Weinand (2018) and Stitic et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Lateral load capacity of WikiHouse composite walls from CNC cut timber panels

Granello¹,

Reynolds²,

Taleb³

et al. 2022

Preprint

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Computer numerical control (CNC) fabrication of interlocking-plate timber structures is a novel construction method that allows to build structural elements without mechanical fasteners: the load transfer mainly relies on direct contact and friction between the composing panels. In this work, the lateral load capacity of shear walls formed from interlocking CNC cut plywood elements is investigated for the first time, by means of experimental testing. The experimental campaign comprises four full scale 5.4 m x 3.1 m wall specimens with and without window openings, and component tests on shear connectors and pegged connections which resist uplift at the base of the wall. A simplified analytical model is proposed and calibrated to capture the response of the wall specimens. Satisfactory agreement with the experimental results in terms of vertical and horizontal displacement can be found, but it is clear that the component tests on the holding down pegs capture only part of the flexibility of the connection of the wall to the base, and a parameter calibrated based on the full-scale wall tests is required to represent the measured behaviour. The failure load can be predicted with reasonable accuracy where failure is initiated by the hold-down connectors.

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Experimental investigations on the load-carrying capacity of digitally produced wood-wood connections

Cited by 17 publications

References 16 publications

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Method of Calculation for Walls of Vertical Squared Timber

Lateral load capacity of WikiHouse composite walls from CNC cut timber panels

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