Study on the strength of glued laminated timber beams with round holes: proposal of the design formula for the splitting strength

Okamoto, Shigefumi; Akiyama, Nobuhiko; Araki, Yoshihiro; Aoki, Kenji; Inayama, Masahiro

doi:10.1186/s10086-022-02013-w

J Wood Sci

2022

DOI: 10.1186/s10086-022-02013-w

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Study on the strength of glued laminated timber beams with round holes: proposal of the design formula for the splitting strength

Shigefumi Okamoto

Nobuhiko Akiyama

Yoshihiro Araki

et al.

Abstract: When a glued laminated timber (GLT) beam with a round hole is subjected to a shear force and bending moment, the hole will crack and fail due to a large tensile stress perpendicular to the grain and shear stresses. If the stresses acting on the hole are known, it is possible to estimate the fracture load. However, it is necessary to obtain the stresses acting on the hole by finite element analysis, which is very time consuming. In this study, to easily estimate the fracture load, we proposed a formula to estim… Show more

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Cited by 3 publications

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Stress and deformation control of prestressed concrete beams with corrugated web

Zhang¹,

Xu²,

Chang³

et al. 2023

mat express

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Under unidirectional loading, the material composition and joint arrangement of prestressed concrete beams with corrugated steel webs are determined by deformation stress parameters. Furthermore, using the combined analysis method of longitudinal loading and mechanical parameters, a stress and deformation control model of prestressed concrete beams with corrugated steel webs under unidirectional loading is established. In this paper, the corrugated steel webs are studied experimentally and theoretically, and numerical simulations are carried out. In this paper, by establishing the relationship between the grain friction angle and roughness of corrugated steel web prestressed concrete beams under uniaxial strain and using concrete loading mode, the forces of corrugated steel web prestressed concrete beams under uniaxial strain are calculated and adaptively regulated. The experimental results show that the algorithm can accurately estimate and control the deformation and stress of Prestressed concrete beams under uniaxial strain. The grain size parameters of prestressed beams with corrugated steel webs under unidirectional loading were studied, and their mechanical properties were optimized.

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Stress and deformation control of prestressed concrete beams with corrugated web

Zhang¹,

Xu²,

Chang³

et al. 2023

mat express

View full text Add to dashboard Cite

show abstract

Study on Strength of Glued Laminated Timber Beams With Two Round Holes

Okamoto¹,

NISHIMURA²,

Nakatani

et al. 2023

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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The purpose of this study is to establish a design method for the splitting strength of glued laminated timber beam with two round holes. In this paper, a design method for splitting strength is proposed by formulating the ratio of the maximum tensile stress perpendicular to the grain acting around the hole as the distance between the holes decreases, using finite element analysis. Then, a three-point bending tests were conducted on a glued laminated wood beam with two round holes, and the experimental and calculated values were compared to confirm the validity of the proposed design method.

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Asymmetric Flexural Behavior of Glulam Beams Based on Bamboo-Inspired Functionally Graded Structure for High Bending Load Applications

Ramful

2024

Journal of Green Building

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Natural materials are being further processed into functionally engineered products to reduce their natural variability and enhance their performance for use in construction, given their noteworthy recyclability, availability and sustainability traits. To date, the mechanical strengths of natural and engineered wood products are limited by their inherent micromechanical characteristics which are outclassed by homogeneous materials like steel and concrete. This study proposes a less process-intensive technique to improve the strength of engineered wood products by considering glulam based on a bio-inspired functionally graded structure. The finite element method was considered to investigate the effects of the functionally graded arrangement on the asymmetric flexural deformation and on the underlying fracture mechanisms in glulam beams. The numerical results showed that the functionally graded arrangements across the cross-section led to an improvement in the bending strength and consequently enhanced the resistance to transverse crack propagation. In the functionally graded glulam beam, the stiffer layers at the bottom were found to promote the onset for longitudinal crack initiation. Moreover, transverse cracks tended to propagate sideways in an orthogonal direction in the beam layers with a high longitudinal to transverse stiffness ratio whereby the tangential normal stress was a maximum. The improvement in performance, which resulted from a shift of the neutral axis and redistribution of stress within the glulam beams, was attributed to the degree of graded arrangement across their cross-section besides the orthotropic characteristics of their individual layers. Key findings of this study could be useful to further develop high-strength engineered wood products based on bio-inspired solutions to replace conventional materials in the construction industry for improved sustainability.

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Study on the strength of glued laminated timber beams with round holes: proposal of the design formula for the splitting strength

Cited by 3 publications

References 6 publications

Stress and deformation control of prestressed concrete beams with corrugated web

Stress and deformation control of prestressed concrete beams with corrugated web

Study on Strength of Glued Laminated Timber Beams With Two Round Holes

Asymmetric Flexural Behavior of Glulam Beams Based on Bamboo-Inspired Functionally Graded Structure for High Bending Load Applications

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