Planar shear and bending properties of hybrid CLT fabricated with lumber and LVL

Wang, Zhiqiang; Hongmei, Fu; Gong, Meng; Luo, Jiayan; Dong, Weiqun; Wang, Ting; Chui, Ying Hei

doi:10.1016/j.conbuildmat.2017.04.205

Cited by 68 publications

(28 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The average out-of-plane shear strength values of CLT specimens calculated based on shear analogy method using the maximum load from FPB and TPB tests were 1.15 and 1.36 MPa, respectively. These values agree well with the values of the three-layer CLT specimens obtained from the modified compression shear testing method in previous studies [11,27]. The RS strength of 2 × 4'' and 2 × 6'' SPF dimension lumber obtained by Gong et al [11] were 0.92 and 1.29 MPa, and the RS strength of SPF dimension lumber measured by Wang et al [27] was 1.41 MPa.…”

Section: Out-of-plane Shear Strength Of Clt Specimens Using Differentsupporting

confidence: 90%

Evaluation of the Out-of-Plane Shear Properties of Cross-Laminated Timber

Yang¹,

Cao²,

Wang³

et al. 2019

Journal of Renewable Materials

Self Cite

View full text Add to dashboard Cite

The out-of-plane shear properties of cross-laminated timber (CLT) substantially influence the overall mechanical properties of CLT. Various testing methods and theories related to these properties have recently been developed. The effects of the number of layers (three and five layers) and testing method (shortspan three-and four-point bending tests) on the out-of-plane shear properties of CLT were evaluated. The out-of-plane shear strength values were calculated based on different theories for comparison. The failure mode in the short-span four-point bending (FPB) method was mainly the rolling shear (RS) failure in the cross layers, indicating that the FPB method was appropriate to evaluate the RS strength of CLT. The out-of-plane shear capacity obtained using the three-point bending (TPB) method was higher than that tested by the FPB method. The testing methods significantly influenced the out-of-plane shear capacity of the three-layer specimens but not that of the five-layer specimens. With an increase in the number of layers, the out-of-plane shear strength of the specimens decreased by 24%. A linear correlation was found among the shear strength values obtained from different theories.

show abstract

Section: Out-of-plane Shear Strength Of Clt Specimens Using Differentsupporting

confidence: 90%

Evaluation of the Out-of-Plane Shear Properties of Cross-Laminated Timber

Yang¹,

Cao²,

Wang³

et al. 2019

Journal of Renewable Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…where d is the depth of the panel, G RT is the rolling shear modulus, and L is the span length. The rationale for this form of equation for Equation (9) are the conclusions that were explained in Section 5.1, which are that the magnitude of c with increasing length approaches 1 and is positively correlated to depth of the panel and the rolling shear modulus. The summary of the results obtained from the parametric study is illustrated in Figure 15.…”

Section: The Form Of the Equation Was Chosen To Bementioning

confidence: 99%

“…Timber boards are orthotropic in nature, where the mechanical properties vary along the longitudinal, tangential, and radial direction [7]. To improve performance of CLT under out-of-plane bending, some researchers investigated the use of engineered wood product such as laminated strand lumber (LSL) and laminated veneer lumber (LVL), as cross-layers [8,9].…”

Section: Introductionmentioning

confidence: 99%

Evaluating Timoshenko Method for Analyzing CLT under Out-of-Plane Loading

et al. 2020

View full text Add to dashboard Cite

Cross-laminated timber (CLT) is an engineered wood product made up of layers of structurally graded timber, where subsequent layers are oriented orthogonally to each other. In CLT, the layers oriented in transverse direction, generally termed as cross-layer, are subjected to shear in radial–tangential plane, which is commonly known as rolling shear. As the shear modulus of cross-layers is significantly lower than that in other planes, CLT exhibits higher shear deformation under out-of-plane loading in contrast to other engineered wood products such as laminated veneer lumber (LVL) and glue laminated timber (GLT). Several analytical methods such as Timoshenko, modified gamma and shear analogy methods were proposed to account for this excessive shear deformation in CLT. This paper focuses on the effectiveness of Timoshenko method in hybrid CLT, in which hardwood cross-layers are used due to their higher rolling shear modulus. A comprehensive numerical study was conducted and obtained results were carefully analyzed for a range of hybrid combinations. It was observed that Timoshenko method could not accurately predict the shear response of CLTs with hardwood cross layers. Comprehensive parametric analysis was conducted to generate reliable numerical results, which were subsequently used to propose modified design equations for hybrid CLTs.

show abstract

“…They suggested that use of hardwoods as cross layer(s) in fabrication of CLT could significantly improve its planar shear performance. Wang et al [7] evaluated the bending properties (in major strength direction) of hybrid CLT (HCLT) fabricated using lumber and/or LVL. It was found that SPF had higher planar shear strength and modulus than LVL.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Sound Insulation for Hybrid CLT Fabricated with Lumber and LVL and comparison with experimental data.

Zhang

et al. 2019

MATEC Web Conf.

View full text Add to dashboard Cite

The insulated predictions were carried out for LVL, CLT and HCLT in order to evaluate their sound properties, in which the theoretical value of sound insulation was predicted by regarding the substances in wood cell wall as equivalence to specific medium based on Biot model, and the wood anatomical characteristics, such as the length and diameter of tracheid, diameter of pit, and porosity, were taken into account for determining the equivalent density and bulk modulus of elasticity of wood cell wall. By comparing the tested and predicted values of sound insulation, the conclusion were drawn as follows: the predicted values of sound insulation were significantly correlated with the tested values for LVL, CLT and HCLT. As for Masson pine and Southern pine, the adjacent of earlywood and latewood was considered as sandwich structure for the calculation of sound insulation. Meanwhile, the bonding interface was creatively introduced to improve the accuracy of sound insulation prediction. The transfer function involved in sound insulation prediction provide an effective method to characterize the sound insulation volume of wood composite in construction and decoration areas.

show abstract

Planar shear and bending properties of hybrid CLT fabricated with lumber and LVL

Cited by 68 publications

References 6 publications

Evaluation of the Out-of-Plane Shear Properties of Cross-Laminated Timber

Evaluation of the Out-of-Plane Shear Properties of Cross-Laminated Timber

Evaluating Timoshenko Method for Analyzing CLT under Out-of-Plane Loading

Calculation of Sound Insulation for Hybrid CLT Fabricated with Lumber and LVL and comparison with experimental data.

Contact Info

Product

Resources

About