Numerical modelling of wood under combined loading of compression perpendicular to the grain and rolling shear

Akter, Shaheda T.; Serrano, Erik; Bader, Thomas K.

doi:10.1016/j.engstruct.2021.112800

Cited by 15 publications

(12 citation statements)

References 27 publications

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“…A recent numerical study by Akter et al [15] confirmed the findings of Madsen et al [16] and Hoffmeyer et al [12] that CPG strength is lowest when the annual rings are orientated at 45 • to the loading direction. Stiffness and strength in the radial direction were found to be higher than in the tangential direction.…”

Section: Introductionsupporting

confidence: 54%

“…Hall [11], Hoffmeyer et al [12], Farruggia and Perré [13], Shipsha and Berglund [14] and Akter et al [15] investigated annual ring structure effects on CPG stiffness and strength.…”

Section: Introductionmentioning

confidence: 99%

“…Classical flow theory of plasticity using Hoffman [20] or Tsai and Wu [21] failure criteria can be used to represent the ductile behavior of wood under compression. Hill's plasticity model [22], as an apparently simpler criterion, and often implemented in commercial finite element software, was shown to be unsuitable for wood because the difference in strength under tensile and compressive loading and the volumetric change of the material under plastic loading are not considered [15,23]. The single-surface criteria can be extended to multi-surface criteria by combining several singlesurface limits [24][25][26][27] or by a so-called Quadratic multi-surface (QMS) failure criterion [28].…”

Section: Introductionmentioning

confidence: 99%

“…The single-surface criteria can be extended to multi-surface criteria by combining several singlesurface limits [24][25][26][27] or by a so-called Quadratic multi-surface (QMS) failure criterion [28]. The latter is composed of several ellipsoidal surfaces and was shown suitable for predicting biaxial loading of wood in the radial-tangential plane of spruce clear wood [15]. Further types of material models used for investigating CPG, such as overlay models that combine elastic material model with a foam plasticity model to account for the plastic volume change [29], are reviewed in Akter et al [15].…”

Section: Introductionmentioning

confidence: 99%

“…The latter is composed of several ellipsoidal surfaces and was shown suitable for predicting biaxial loading of wood in the radial-tangential plane of spruce clear wood [15]. Further types of material models used for investigating CPG, such as overlay models that combine elastic material model with a foam plasticity model to account for the plastic volume change [29], are reviewed in Akter et al [15].…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study of the Stiffness and Strength of Cross-Laminated Timber Wall-to-Floor Connections under Compression Perpendicular to the Grain

et al. 2021

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The use of cross-laminated timber (CLT) in multi-story buildings is increasing due to the potential of wood to reduce green house gas emissions and the high load-bearing capacity of CLT. Compression perpendicular to the grain (CPG) in CLT is an important design aspect, especially in multi-storied platform-type CLT buildings, where CPG stress develops in CLT floors due to loads from the roof or from upper floors. Here, CPG of CLT wall-to-floor connections are studied by means of finite element modeling with elasto-plastic material behavior based on a previously validated Quadratic multi-surface (QMS) failure criterion. Model predictions were first compared with experiments on CLT connections, before the model was used in a parameter study, to investigate the influence of wall and floor thicknesses, the annual ring pattern of the boards and the number of layers in the CLT elements. The finite element model agreed well with experimental findings. Connection stiffness was overestimated, while the strength was only slightly underestimated. The parameter study revealed that the wall thickness effect on the stiffness and strength of the connection was strongest for the practically most relevant wall thicknesses between 80 and about 160 mm. It also showed that an increasing floor thickness leads to higher stiffness and strength, due to the load dispersion effect. The increase was found to be stronger for smaller wall thicknesses. The influence of the annual ring orientation, or the pith location, was assessed as well and showed that boards cut closer to the pith yielded lower stiffness and strength. The findings of the parameter study were fitted with regression equations. Finally, a dimensionless ratio of the wall-to-floor thickness was used for deriving regression equations for stiffness and strength, as well as for load and stiffness increase factors, which could be used for the engineering design of CLT connections.

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Section: Introductionsupporting

confidence: 54%

“…Hall [11], Hoffmeyer et al [12], Farruggia and Perré [13], Shipsha and Berglund [14] and Akter et al [15] investigated annual ring structure effects on CPG stiffness and strength.…”

Section: Introductionmentioning

confidence: 99%