Modeling the influence of delamination on the mechanical performance of straight glued laminated timber beams

Gaspar, Florindo; Cruz, Helena; Gomes, Augusto

doi:10.1016/j.conbuildmat.2015.08.011

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…At this moment, the compressive zone is considered as an ideal elastic-plastic body and the tensile zone as a perfectly elastic body [44]. (4) The bonding between the laminates is intact without relative slip [45]. (5) As shown in Fig.…”

Section: Theoretical Assumptionsmentioning

confidence: 99%

Stiffness and Shear Stress Distribution of Glulam Beams in Elastic-Plastic Stage: Theory, Experiments and Numerical Modelling

Luo¹,

Xie²,

Zhang³

et al. 2023

Journal of Renewable Materials

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Traditional methods focus on the ultimate bending moment of glulam beams and the fracture failure of materials with defects, which usually depends on empirical parameters. There is no systematic theoretical method to predict the stiffness and shear distribution of glulam beams in elastic-plastic stage, and consequently, the failure of such glulam beams cannot be predicted effectively. To address these issues, an analytical method considering material nonlinearity was proposed for glulam beams, and the calculating equations of deflection and shear stress distribution for different failure modes were established. The proposed method was verified by experiments and numerical models under the corresponding conditions. Results showed that the theoretical calculations were in good agreement with experimental and numerical results, indicating that the equations proposed in this paper were reliable and accurate for such glulam beams with wood material in the elastic-plastic stage ignoring the influence of mechanic properties in radial and tangential directions of wood. Furthermore, the experimental results reported by the previous studies indicated that the method was applicable and could be used as a theoretical reference for predicting the failure of glulam beams.

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Section: Theoretical Assumptionsmentioning

confidence: 99%

Stiffness and Shear Stress Distribution of Glulam Beams in Elastic-Plastic Stage: Theory, Experiments and Numerical Modelling

Luo¹,

Xie²,

Zhang³

et al. 2023

Journal of Renewable Materials

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“…Moreover, moisture levels are also influenced by temperature and moisture fluctuations, which can lead to wood shrinkage and swelling [14]. These variations, in turn, may result in delamination and cracks, compromising the load-bearing capacity of glulam structures [12,20].…”

Section: Introductionmentioning

confidence: 99%

“…Damage caused by insects can be mechanical or aesthetic and may not be visible on the surface. Exit holes, left by adult insects vacating their nests [18,20], can be used to identify the type of insect that caused the damage and can compromise the structural stability of the wood.…”

Section: Introductionmentioning

confidence: 99%

Mind-Mapping Assessment of Reuse Potential of Glulam: An Experimental Study

Yahmi,

Nouri,

Tahlaiti

et al. 2023

Buildings

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The goal of this work is to suggest a method for assessing the state of salvaged glued laminated timber and deciding whether it is appropriate for reuse. After conducting a thorough analysis of the wood pathology, a decision tree mind map was created. This was followed by the application of this methodology to evaluate a salvaged glulam frame obtained from a demolition site. To ensure the reliability of this approach, laboratory-based ex situ tests were carried out. A working protocol was established for obtaining a sample of the salvaged timber, and its characteristics were identified by examining the species, density, type of adhesive and its shear resistance, as well as the mechanical properties in the bending of both single and double laminates of timber. The results concluded that the glulam under investigation can be reused. The results revealed that the wood was spruce, with a density of 420 ± 45 kg/m3 under dry conditions. The glue used was melamine–urea–formaldehyde with a shear strength of 7.37 ± 1.79 MPa, which is below the standard threshold. The results of the bending strength and modulus of elasticity show that the single laminations and glulam are class C16 and class GL20H, respectively.

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“…Most of these phenomena are expressed in the by-support area. [12,13] The analysis of the works shows that the testing of standard samples does not provide an adequate picture of the nature of the distribution of forces in the body of the structure. Full-scale testing of elements has a high cost and complexity, which entails a rise in design cost.…”

Section: Introductionmentioning

confidence: 99%

Studying the influence of the cross section height on the distribution of the internal efforts of wooden glued beams

Prokhorov

2019

E3S Web Conf.

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Since ancient times, wooden structures have been used by man for the construction of buildings and facilities. For many centuries, the structural elements of buildings and facilities made of wood have been the main ones, and still have broad prospects for use in modern capital construction, as they have sufficient high strength and stiffness, are reliable and durable, while having a small mounting weight. In particular, a number of Western countries are already erecting high-rise buildings using a framework of laminated wood constructions. The indisputable advantage of wooden structures is environmental friendliness. However, with all the harmony of the wood structure, its tracheid’s are not standard, which is the main reason for the variability of its mechanical properties. With alteration of a cross-section of flexural member, the nature of the load distribution, as well as the nature of the fracture, changes. An additional factor that affecting the force distribution is the nature of the reinforcement and methods of the reinforcement fixing methods. The methods used to calculate the “low” reinforced beams often give a large error in the calculation of “high” beams. In the work, a rational methodology for calculating wooden glued reinforced beams with symmetrical reinforcement is determined.

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Modeling the influence of delamination on the mechanical performance of straight glued laminated timber beams

Cited by 11 publications

References 17 publications

Stiffness and Shear Stress Distribution of Glulam Beams in Elastic-Plastic Stage: Theory, Experiments and Numerical Modelling

Stiffness and Shear Stress Distribution of Glulam Beams in Elastic-Plastic Stage: Theory, Experiments and Numerical Modelling

Mind-Mapping Assessment of Reuse Potential of Glulam: An Experimental Study

Studying the influence of the cross section height on the distribution of the internal efforts of wooden glued beams

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