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Numerical investigation on the mechanical behaviour of glulam post-to-beam STS-reinforcing connections

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In glulam post-to-beam structures, the self-tapping screw (STS) is usually used as reinforcement perpendicular to the wood grain to mitigate the propagation of fracture and improve the lateral resistance capacity of the post-to-beam connection. The behavior of the STS-reinforcing connection is influenced by several parameters. Using numerical model to conduct parametric study is cost-efficient and time-saving. In this paper, a three-dimensional finite element model (3D FEM) of STS-reinforcing connection was developed. For validation, its results were compared with the experimental results. In this model, timber members were simulated by a nonlinear anisotropic model based on Hill yield criterion, and the cohesive zone model was used to simulate the crack opening and growth. Moreover, the STS was modeled by nonlinear spring element. With the validated model, the stress analysis of the STS-reinforcing connection was conducted. The effect of the STS-diameter, the STS-arrangement-space and the STS-number on the performance of the STS-reinforcing connections were investigated. The stress analysis indicates that the opening and growth of crack are determined by interaction between shear stress parallel-to-grain and tensile stress perpendicular-to-grain, with a higher contribution of tensile stress perpendicular-to-grain. The parametric analysis shows that the initial stiffness of the STS-reinforcing connection is slightly influenced by the STS-diameter, the STS-arrangement-space and the STS-number. The ultimate bearing capacity of the STS-reinforcing connection becomes larger with the STS-diameter and STS-number increase. Besides, the proper STS-arrangement-space is suggested to be within 4 to 5 times of the STS-diameter.
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Keywords: Numerical investigation; STS-reinforcing connections; glulam; post-to-beam

Document Type: Research Article

Affiliations: 1: Ph.D. Student, Department of Structural Engineering, Tongji University, Shanghai, P.R.China, Email: [email protected] 2: Professor, Department of Structural Engineering, Tongji University, Shanghai, P.R.China, Email: [email protected]

Publication date: August 20, 2015

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