In-plane shear modulus of cross-laminated timber by diagonal compression test

Berg, Sven; Turesson, Jonas; Ekevad, Mats; Björnfot, Anders

doi:10.15376/biores.14.3.5559-5572

Cited by 7 publications

(12 citation statements)

References 6 publications

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“…In the diagonal compression test method, a square CLT panel was compressed in one diagonal direction by a displacement controlled hydraulic jack. Please refer to [5,6] for more details on the test procedure. During a diagonal compression test, only one diagonal was compressed, and the second diagonal was left without control of the displacement.…”

Section: Diagonal Compression Testmentioning

confidence: 99%

“…One is to glue only the flat sides of the boards, and the other one is to glue both flat and side edges. For the CLT panels glued on both flat and side edges of the boards, G will be equal to the shear modulus of solid wood [5]. Omitting side edge gluing means that G will be lower than the shear modulus for solid wood.…”

Section: Introductionmentioning

confidence: 99%

“…Other studies have concluded that board dimensions affect G but not analysed how much. Some studies have calculated G from different variants of the picture frame testing method; see [6][7][8][9], and others have used the diagonal compression test method [5,6,10,11]. Recently, a method similar to the diagonal compression test has been used, but in a more sophisticated way [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In [6], this was the reason for the less accurate result from the diagonal compression test. The isotropic shear stress has been adjusted in [5] where the equation for calculating G was created based on FE (finite element) simulations. The limited scope in [5] 0 resulted in a restricted equation which is only valid for the specific sizes and conditions occurring in the study and not in a general case.…”

Section: Introductionmentioning

confidence: 99%

“…The isotropic shear stress has been adjusted in [5] where the equation for calculating G was created based on FE (finite element) simulations. The limited scope in [5] 0 resulted in a restricted equation which is only valid for the specific sizes and conditions occurring in the study and not in a general case. In [10], an equation suitable for a perfect shear condition has been used, but this situation does not occur during a diagonal compression test [6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of laminate direction and glue area on in-plane shear modulus of cross-laminated timber

et al. 2020

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The use of cross-laminated timber (CLT) in constructing tall buildings has increased. So, it has become crucial to get a higher in-plane stiffness in CLT panels. One way of increasing the shear modulus, G, for CLT panels can be by alternating the layers to other angles than the traditional 0° and 90°. The diagonal compression test can be used to measure the shear stiffness from which G is calculated. A general equation for calculating the G value for the CLT panels tested in the diagonal compression test was established and verified by tests, finite element simulations and external data. The equation was created from finite element simulations of full-scale CLT walls. By this equation, the influence on the G value was a factor of 2.8 and 2.0 by alternating the main laminate direction of the mid layer from the traditional 90° to 45° and 30°, respectively. From practical tests, these increases were measured to 2.9 and 1.8, respectively. Another influence on the G value was studied by the reduction of the glue area between the layers. It was shown that the pattern of the contact area was more important than the size of the contact area.

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Section: Diagonal Compression Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of laminate direction and glue area on in-plane shear modulus of cross-laminated timber

et al. 2020

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Diaphragm shear and diagonal compression testing of cross-laminated timber

Sharifi

Berg

et al. 2021

SN Appl. Sci.

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To learn the characteristics of a cross-laminated timber (CLT) panel, it is crucial to perform experimental tests. This study presents two experimental test methods to measure the in-plane shear modulus of CLT panels. This characteristic can be measured by multiple methods such as the picture frame test, the diagonal compression test, and the diaphragm shear test. In this study, the same CLT panels are tested and evaluated in the diaphragm shear test and the diagonal compression test to see if more reliable results can be achieved from the diaphragm shear test. This evaluation is done by experimental tests and finite element simulations. The theoretical pure shear simulation is used as a reference case. Finite element simulations are made for both edge glued and non-edge glued CLT panels. Nine CLT panels are tested in the diaphragm shear test and the diagonal compression test. During ideal conditions (uniform material properties and contact conditions), all three simulated methods result in an almost equal shear modulus. During the experimental testing, the diagonal compression test gives more coherent results with the expected shear modulus based on finite element simulations. Based on the diaphragm shear test results, the CLT panels behave like edge glued, but this situation is dismissed. However, during ideal conditions, the diaphragm shear test is seen as a more reliable method due to the higher proportion of shear in the measured area. Article Highlights• Comparing the two experimental methods: the diaphragm shear test and the diagonal compression test.• Using the theoretical pure shear simulations to verify the experimental methods. • Experimental testing and finite element analysis of the same cross-laminated timber panel. Keywords Cross-laminated timber • CLT • Diagonal compression test • Diaphragm shear test • In-plane shear modulus * Jonas Sharifi,

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Experimental and Analytical Lateral Performance of Posttensioned CLT Shear Walls and Conventional CLT Shear Walls

Sun

2020

J. Struct. Eng.

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In-plane shear modulus of cross-laminated timber by diagonal compression test

Cited by 7 publications

References 6 publications

Influence of laminate direction and glue area on in-plane shear modulus of cross-laminated timber

Influence of laminate direction and glue area on in-plane shear modulus of cross-laminated timber

Diaphragm shear and diagonal compression testing of cross-laminated timber

Experimental and Analytical Lateral Performance of Posttensioned CLT Shear Walls and Conventional CLT Shear Walls

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