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

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Abstract Traditional light timber framing systems, comprised of stud to top and bottom plate connections, suffer from relatively low stiffness along compression perpendicular-to-grain of the plates, leading to excessive shortening… Click to show full abstract

Abstract Traditional light timber framing systems, comprised of stud to top and bottom plate connections, suffer from relatively low stiffness along compression perpendicular-to-grain of the plates, leading to excessive shortening of studs in mid-rise buildings. Experimental testing of timber stud to plate connections revealed that a reinforcement technique employing self-tapping screws, placed at the top/bottom plate interface, was an efficient way to enhance the connection stiffness and alleviate permanent displacements. In other words, the combination of bonding stress development at the interface of self-tapping screws and timber stud as well as plastic deformation , built up in timber plate in compression perpendicular-to-grain, plays an important role in improving the bearing stiffness/strength of these connections. In this paper, structural performance of light timber framing connections, strengthened with self-tapping screws under gravity loading is investigated, utilising finite element modelling . Continuum damage mechanics framework along with traction-separation cohesive zone technique are incorporated in detecting various failure scenarios and damage propagation for timber components in the finite element modelling. Small-scale unreinforced and reinforced stud to top/bottom plate connections using the Machine Graded Pine timber and high strength self-tapping screws were employed and tested experimentally to calibrate the finite element modelling parameters. Calibrated parameters are then utilised to establish a full-scale light timber framing finite element model. It is demonstrated that finite element models established in this paper can predict the load-displacement response and failure modes of reinforced light timber framing systems.

Keywords: self tapping; light timber; finite element; tapping screws; timber framing; timber

Journal Title: Journal of building engineering
Year Published: 2021

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