Cross laminated timber (CLT) diaphragms under shear: Test configuration, properties and design

Brandner, Reinhard; Dietsch, Philipp; Dröscher, Julia; Schulte-Wrede, Michael; Kreuzinger, Heinrich; Sieder, Mike

doi:10.1016/j.conbuildmat.2017.04.153

Cited by 87 publications

(84 citation statements)

References 7 publications

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“…Another different test setup, based on a particular configuration with orientation of 14 • in respect to the compression force, is presented in Brandner et al (2013) (from Hirschmann, 2011 which achieves shear failure in lamellas with a value f v,mean = 9 MPa. Another test which succeeded in obtaining shear failure in lamellas is the one presented in Brandner et al (2017) (taken also from Kreuzinger and Sieder, 2013;Dröscher, 2014;Brandner et al, 2015). It contemplates a compression test on a column specimen which has grain orientation at an angle in respect to the applied force; results are provided for a series tested at TU Graz and another at TU Munich, which are, respectively, f v,mean = 7, 3 MPa and f v,mean = 7, 6 MPa.…”

Section: Discussion and Comparisonmentioning

confidence: 99%

Cross Laminated Timber (CLT) Beams Loaded in Plane: Testing Stiffness and Shear Strength

Boggian

Andreolli²,

Tomasi

2019

Front. Built Environ.

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Cross Laminated Timber (CLT) is a relatively new timber product used in construction that has gained popularity over the last decade. The product itself is constituted by multiple glued layers of juxtaposed boards, usually arranged in an orthogonal direction between one layer and the adjacent ones. This particular structure brings several benefits, such as the possibility to use the same product both for walls and slabs, since it can bear in-plane and out-of-plane loads. However, the mechanical behavior differs from usual timber products, and research is still ongoing to achieve common agreement on standard procedures for testing products and theories for evaluating stresses for safety verifications. This paper focuses on the in-plane shear behavior of CLT and analyzes the existing methods to evaluate shear stresses. An experimental part then presents a four-point bending test of CLT beams with a specific geometry to induce shear failure. Results are reported both for the elastic range test, measuring the Modulus of Elasticity, and for the failure test to investigate shear behavior with regard to different mechanisms. Previously exposed methods are used for the calculation of shear stresses and to analyze the correspondence between them, and the results are then compared with other existing tests and values in literature. A new test setup for future research is eventually proposed.

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Section: Discussion and Comparisonmentioning

confidence: 99%

Cross Laminated Timber (CLT) Beams Loaded in Plane: Testing Stiffness and Shear Strength

Boggian

Andreolli²,

Tomasi

2019

Front. Built Environ.

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“…An equivalent shear modulus G eq which takes into account the number of layers, the total thickness of the panels and the width of boards is considered as proposed by Brandner et al [29]. Figure 3 shows the connection stiffnesses in the PM.…”

Section: The Plane Model -Pmmentioning

confidence: 99%

In-plane elastic flexibility of cross laminated timber floor diaphragms

D’Arenzo

Casagrande

Reynolds

et al. 2019

Construction and Building Materials

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“…GA e f f ,d = kGA gross (3) in which I gross and A gross are the gross moment of inertia and cross-sectional area of the beam and k is the shear correction factor. Since the shear correction factor of a laminated composite such as CLT and CLP is dependent on its layup and the properties of laminates [15], the effective shear stiffness is defined as kGA gross to avoid ambiguity.…”

Section: Modal Testsmentioning

confidence: 99%

“…In addition, edge-gluing is not mandatory in CLT production [1]. The gaps in the non-edge-glued CLT panels not only can reduce the mechanical properties such as in-plane shear strength and modulus [2,3] but also are unfavorable to fire and building physics considerations. SCL is an important category of engineered wood product in North America, which includes laminated veneer lumber (LVL), laminated strand lumber (LSL), oriented strand lumber (OSL), and parallel strand lumber (PSL).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Innovative, Multi-Layer Composite Laminated Panels

2018

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Cross-laminated timber (CLT) possesses both good shape stability and possible two-way force transfer ability due to its crosswise lamination. However, the transverse layers in CLT are prone to rolling shear failure under an out-of-plane load. An innovative multi-layer composite laminated panel (CLP) was developed by combining structural composite lumber (SCL) and dimension lumber to overcome the rolling shear failure while maintaining the high mechanical performance and aesthetic appearance of natural wood. The mechanical properties of 5-layer CLP that consisted of laminated strand lumber (LSL) and dimension lumber with different layups were evaluated by both static and modal tests. The results showed that the shear resistance, bending stiffness, and moment resistance of CLP were up to 143%, 43%, and 87% higher than their counterparts of regular CLT, respectively. The failure modes observed in both shear and bending tests indicated that the use of LSL in transverse layers could eliminate the potential rolling shear failure in CLT. With the lamination properties from components tests as inputs, the validity of shear analogy method was assessed by test results. The mechanical properties can be well predicted by shear analogy method except for the bending moment resistance of CLP and CLT with either rolling failure in the cross layer or tension failure in the bottom layer.

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Cross laminated timber (CLT) diaphragms under shear: Test configuration, properties and design

Cited by 87 publications

References 7 publications

Cross Laminated Timber (CLT) Beams Loaded in Plane: Testing Stiffness and Shear Strength

Cross Laminated Timber (CLT) Beams Loaded in Plane: Testing Stiffness and Shear Strength

In-plane elastic flexibility of cross laminated timber floor diaphragms

Mechanical Properties of Innovative, Multi-Layer Composite Laminated Panels

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