Computational simulation of light timber framing connections strengthened with self-tapping screws

Kildashti, Kamyar; Alinoori, Farnaz; Moshiri, Farzad; Samali, Bijan

doi:10.1016/j.jobe.2021.103003

Cited by 5 publications

(2 citation statements)

References 38 publications

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“…Experimental studies by Lokaj and Klajmonová [18] on reinforcing round wood connections identified that screw reinforcement has the advantages of simplicity and low cost compared to other forms of metal reinforcement, such as steel plates. More recent studies on screw reinforcement further demonstrate its capability to enhance the mechanical performance of connections made from bio-based materials [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Timber Dowel-Type Connections Using Self-Tapping Screws and the Influence of Thread Configurations

Zhang

Huang

et al. 2023

Forests

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The application of self-tapping screws as reinforcement on glulam connections has been proven effective. However, the implication of different thread configurations on the effectiveness of reinforcement remains unknown. This paper conducted experiments using screws with various thread configurations in embedment-strength tests and tensile connection tests. Results show that self-tapping screws with one third of thread achieved similar improvement in the embedment strength and mechanical properties of connections as fully threaded screws. This implies that properly reducing the thread length on self-tapping screws ensures easier screw installation than using fully threaded screws. The influence of screw-to-dowel distance was also investigated and two distances (0.5 d and 1 d) were adopted, with ‘d’ being the diameter of the dowel. The difference in embedment strength due to different screw-to-dowel distances was insignificant. The group with screws placed in contact (0.5 d) with the dowel achieved 5% higher embedment strength than the group with screws placed at a 1 d distance. The connection tests showed good agreement with the embedment-strength tests. This confirms that self-tapping screws with reduced thread can enhance the load-carrying capacity and ductility of connections to a level similar to connections reinforced by fully threaded screws.

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Section: Introductionmentioning

confidence: 99%

Reinforcement of Timber Dowel-Type Connections Using Self-Tapping Screws and the Influence of Thread Configurations

Zhang

Huang

et al. 2023

Forests

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“…Other solutions to prevent and delay brittle failure in connections are using glued-on boards [14] , punched metal plate [14] , nail plate [15][16][17] and multiaxial stitch-bonded fabric [18]. A cost-effective method to prevent crack growth in timber perpendicular to grain is to reinforce it in the weak direction using self-tapping screws [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Numerical assessment of the interaction between shear and moment actions in LVL bolted connections

Masaeli

Karampour

Talebian

et al. 2022

Journal of Building Engineering

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Capacity models for timber under compression perpendicular to grain with screw reinforcement

et al. 2023

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This paper compares the performance of probabilistic and deterministic capacity models for reinforced timber members under compression perpendicular to the grain. A database collecting approximately 60 test results has been compiled by reviewing research papers and master’s and doctoral theses from the past twenty years. The capacity model proposed for the next generation of Eurocodes assesses the capacity as the minimum between the values associated with two failure modes, one at the contact plate and one at the screw tips. The main drawbacks of the model are the excessive elaborateness, given its limitation in accuracy and the fallacy in predicting the observed failure modes. In detail, the failure by the screw tips seldom occurs, although it was expected in more than half of the selected specimens. The authors attempted to simplify the capacity equation by proposing a generalized expression corresponding to the failure mode at the contact plate, corrected by a factor including the effects of load and screw arrangement and geometric details of the specimen. A deterministic mechanical model obtained by multiplying the timber strength by the contact area with a given coefficient performs better than the Eurocode model, which attempts to include the effect of load diffusion (R$$^2\approx 0.27$$ 2 ≈ 0.27 ). A constant factor equal to 2 yields a suitable fitting (R$$^2\approx 0.76$$ 2 ≈ 0.76 ). The best performance is achieved with a four-term polynomial, with adimensional addends, leading to an optimum fitting (R$$^2\approx 0.82$$ 2 ≈ 0.82 ).

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Computational simulation of light timber framing connections strengthened with self-tapping screws

Cited by 5 publications

References 38 publications

Reinforcement of Timber Dowel-Type Connections Using Self-Tapping Screws and the Influence of Thread Configurations

Reinforcement of Timber Dowel-Type Connections Using Self-Tapping Screws and the Influence of Thread Configurations

Numerical assessment of the interaction between shear and moment actions in LVL bolted connections

Capacity models for timber under compression perpendicular to grain with screw reinforcement

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