Applicability of the torsion test and photogrammetric approach on structural timber beams

Mohamed, Ahmed; Uheida, Kal; Quan, Yanfang; Zhang, Hexin

doi:10.1080/20426445.2021.1952047

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…An increasing number of TCC structures have been applied in the refurbishment of existing timber oors, construction of new oors, or as a deck for timber bridges all around the world [2]. The growing demands from the industry have also attracted increasing research interest in this area and its relevant supporting technologies in recent years [3][4][5][6][7][8][9][10][11][12]. However, growing concerns associated with deforestation's environmental and ecological impact highlight the need for alternatives to traditional wood materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Curved and Straight Laminated Bamboo-Concrete Beams with New Calibration Method for Interface Slip

Deng

Hao

Mohamed

et al. 2023

Preprint

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This study echoes the rising demand for bio-based material in concrete composite structures in the race to accelerate carbon neutrality in construction. Noticing that most previous studies are focused on straight timber or engineered bamboo-to-concrete composite beams, this study focuses on: 1) developing unique and practical curved laminated bamboo-concrete (LBC) composite beams; 2) experimentally investigating and comparing the structural performances of the curved and straight LBC composite beams; 3) developing a novel and proper in-member interface shear slip calibration method that captures the longitudinal after-slip strain redistribution, validated by stain gauge measurements. This study also highlights the interlayer shear bonding strength of laminated bamboo as the thresholding parameter that determines the composite beams' overall flexural strength, evidenced by detailed failure mode analysis. The proposed interface shear slip calibration method can be extended to the other types of shear connectors such as screws, shear plates, etc.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Curved and Straight Laminated Bamboo-Concrete Beams with New Calibration Method for Interface Slip

Deng

Hao

Mohamed

et al. 2023

Preprint

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“…This test is the only method that imposes a state of pure shear stress on a specimen, and it has been proven to have more advantages for measuring the shear modulus value of timber and glulam beams. Recently, the torsion test has been adopted more frequently by researchers to evaluate the shear modulus of structural-size timber and glulam beams (Gupta et al 2002; Gupta and Siller 2005; Hindman et al 2005; Khokhar et al 2010; Zhang et al 2011; Mohamed et al 2015; Mohamed, A., et al 2021; Mohamed, A., et al 2021; Gharavi et al 2017; Gharavi et al 2018; Gharavi, N. and H. Zhang, 2018), as well as laminated structural glass beams (Uheida, K., et al 2021; Zhang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Verification of the photogrammetric approach on the torsion test method for timber beams

Mohamed

Uheida

Quan

et al. 2021

International Wood Products Journal

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The photogrammetric approach was proposed in this study to evaluate torsional behaviour of glulam timber beams during the torsion test. The main objectives were to investigate the applicability of the photogrammetric approach and to monitor more details of angles of twist of glulam timber beams. Experiments were conducted and the twists on long and short sides of the cross section were measured using the photogrammetric approach and inclinometer sensors, which were used to validate the accuracy. The test results showed that the optical system allowed monitoring the rotations of the samples at different locations which would not be possible to obtain using the traditional techniques. The results also showed that there is a non-linearity from the measurement of the shear displacements along the long side of the cross-section. However, the average rotation shows clear agreements with the inclinometer readings.

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“…One of the most important design considerations is in the lateral torsional buckling (LTB) phenomena. This has been a hot topic [1]in the field as several recent studies have focused on the LTB mode in glass beams [2][3][4][5][6][7][8][9][10], and analytical models have been proposed in the pre-normative glass design code [11]. One of the key factors in modelling the structural behaviour of the glass beam in lateral buckling failure is the estimation of the shear modulus, G, which is an important mechanical property when determining the recovery torque in the governing equation of the lateral stability.…”

Section: Introductionmentioning

confidence: 99%

Evaluate equivalent-sectional shear modulus for laminated glass beams using in torsion tests and photogrammetry method

Uheida

Deng

Zhang

et al. 2021

Preprint

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This paper proposes a concise concept for quantifying the shear/torsional stiffness of the laminated glass beams experimentally by introducing the Equivalent-Sectional Shear Modulus (ESSM), that is directly measured from the torque and sectional-rotation correlation with the torsion test and tailor-made photogrammetry technique. The advantage of this method is originated from the concept of measuring the overall rotation to torque response of a laminated glass beam altogether rather than the component individually. This eliminates the uncertainties of analytical approximations that are commonly adopted by most existing methods in which the composite shear/torsion stiffness is derived from its component mechanical properties. The photogrammetry technique increased the accuracy of the sectional rotation measurement by acquiring dense displacement sample points on the glass beam simultaneously. The accuracy of the photogrammetry setup and efficacy of the test design were proven by a micrometre and a monolithic glass beam test. One sample each for the polyvinyl butyral (PVB) and SentryGlas Plus (SGP) laminated glass beams were tested multiple times non-destructively to determine the ESSM. The result of the SGP laminated glass beam showed a closer agreement with the previous studies, however the result of the PVB laminated glass beam exhibited a larger difference from the previous studies. It also suggested that mechanical properties of the interlayer played an important role in the composite behaviour of the laminated glass beam. The experimental outcomes have demonstrated the proposed method is an accurate and effective technique for measuring the ESSM of laminated glass beams.

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Applicability of the torsion test and photogrammetric approach on structural timber beams

Cited by 6 publications

References 19 publications

Experimental Investigation of Curved and Straight Laminated Bamboo-Concrete Beams with New Calibration Method for Interface Slip

Experimental Investigation of Curved and Straight Laminated Bamboo-Concrete Beams with New Calibration Method for Interface Slip

Verification of the photogrammetric approach on the torsion test method for timber beams

Evaluate equivalent-sectional shear modulus for laminated glass beams using in torsion tests and photogrammetry method

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