Prediction of the mechanical properties of timber members in existing structures using the dynamic modulus of elasticity and visual grading parameters

Arriaga, Francisco J.; Osuna-Sequera, Carlos; Bobadilla, Ignacio; Esteban, Miguel

doi:10.1016/j.conbuildmat.2022.126512

Cited by 21 publications

(5 citation statements)

References 22 publications

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“…A similar analysis was conducted with the static modulus of elasticity (Figure 5, right). The goodness of prediction lowered (R 2 = 0.53), but it was comparable with that reported for the newly sawn [26] and old timber [38]. Regarding the stiffness values, on average, the dynamic MOE determined by the Microsecond Timer was 40% higher than the static MOE.…”

Section: Idsupporting

confidence: 76%

Density Estimation by Drilling Resistance Technique to Determine the Dynamic Modulus of Elasticity of Wooden Members in Historic Structures

Brunetti

Aminti

Vicario

et al. 2023

Forests

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(1) The assessment of the mechanical properties of old timber is essential for the proper maintenance of wooden structures. (2) Among the non-destructive properties, the dynamic modulus of elasticity is one of the best predictors of the mechanical characteristics of the members, but it requires the determination of wood density to be determined. (3) Thus, wood density was estimated by drilling resistance measurements, developing species-specific prediction equations for silver fir, chestnut and poplar. (4) The estimated density was combined with the stress wave velocity propagating longitudinally through the wooden piece, and the dynamic modulus of elasticity was calculated. (5) Medium-high coefficient determinations (R2 from 0.79 to 0.94) were found for density estimation, and medium coefficient determinations (R2 from 0.53 to 0.60) were found for the estimation of the static modulus of elasticity using the dynamic modulus.

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Section: Idsupporting

confidence: 76%

Density Estimation by Drilling Resistance Technique to Determine the Dynamic Modulus of Elasticity of Wooden Members in Historic Structures

Brunetti

Aminti

Vicario

et al. 2023

Forests

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“…This technique is also applied for the production of engineered wood products (Bucur 2006, Ross 2015. According to Arriaga et al (2022), velocities measured with the ultrasonic and stress wave methods had similar average value.…”

Section: Introductionmentioning

confidence: 89%

Mechanical characterization of visually graded boards from turkish fir and black pine by nondestructive and destructive tests

Kurul,

Şişman,

Dündar

2023

Maderas-Cienc Tecnol

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For the mechanical characterization of Turkish fir and black pine, 400 board specimens with 22 mm× 50 mm × 420 mm were visually graded according to TS 1265 standard. Nondestructive tests were here upon performed using the stress wave method. After specimens were intentionally tested under flatwise bending to research the applicability as an alternative to tension and edgewise bending tests in European strength grading system. According to analyses of variance, the mean values of MOR and MOE differed in four groups at a p<0,05 significance level for visually graded boards. High correlations were found between MOR-MOE (R2=0,837) for fir and MOR-MOE (R2=0,776) for black pine. In addition, correlations of MOR-Knot rate for fir and black pine were respectively R2=0,669 and R2=0,660 showing the effectiveness of flatwise bending tests with the visual grading standard. For nondestructive tests, the mean values of the dynamic modulus of elasticity were very close in between fir and black pine grades while the usage of defect-free density performed better than the density of the whole specimen. Higher strength classes were found for black pine boards (Class 1= C40, Class 2= C27 and Class 3= C22) compared to fir boards (Class 1= C24, Class 2= C22 and Class 3= C18), respectively. Moreover, a simplified nonlinear material model was proposed for numerical modelling, and the results were found in good agreement in terms of the bending stiffness, strength, and deformation capacity of boards especially for class 1 and class 2 in both softwood species.

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“…The rubber material has a hardness of 60, an elastic modulus of 445 N/cm 2 , a shear modulus of 106 N/cm 2 , a correction factor of 0.57, and a Poisson’s ratio of 0.4. Note that the influence of elastic properties of materials on non-homogeneous structures and their determination play an important role in the estimation of the structural response of heterogeneous materials such as CLT [ 25 , 26 ]. In this study, the elastic properties are obtained based on Ref.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Research on Lateral Resistance Performance of Prestressed Cross-Laminated Timber–Concrete Composite Structures under Reciprocating Loads

Xu,

Huang,

Zhang

et al. 2024

Materials

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Cross-Laminated Timber (CLT) and concrete composite structures represent an architectural system that integrates the strengths of both materials. In this innovative configuration, the CLT and concrete collaborate synergistically, harnessing their individual merits to achieve enhanced structural performance and functionality. Specifically, the CLT offers a lightweight design, superior bending resistance, and immense engineering plasticity, while concrete boasts exceptional compressive strength and durability. This study investigates the mechanical performance of CLT–concrete composite structures through quasi-static reciprocating loading tests in three full-scale CLT shear wall samples. Designed with varying initial prestressing forces and dimensions of the CLT panel, the prestressed CLT–concrete structures demonstrated a reduced dependence on the steel nodes, resulting in an increase in yield load, yield displacement, and maximum load-carrying capacity. Maximum capacity increased by 39.8% and 33.7% under initial prestressing forces of 23 kN and 46 kN on steel strands. Failure occurred due to localized compressive failure on prestressed steel strands and anchor plates. ABAQUS finite element analysis established three refined models, revealing that the increased initial prestressing force moderately enhanced stiffness but reduced ductility under similar cross-sectional dimensions. Furthermore, under consistent CLT material, dimensions, prestressing force, and loading conditions, prestressed CLT–concrete structures exhibited a higher maximum load-bearing capacity than prestressed CLT–steel composite structures. This study proposes structural design recommendations based on experimental and simulation results, incorporating specific assumptions.

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Prediction of the mechanical properties of timber members in existing structures using the dynamic modulus of elasticity and visual grading parameters

Cited by 21 publications

References 22 publications

Density Estimation by Drilling Resistance Technique to Determine the Dynamic Modulus of Elasticity of Wooden Members in Historic Structures

Density Estimation by Drilling Resistance Technique to Determine the Dynamic Modulus of Elasticity of Wooden Members in Historic Structures

Mechanical characterization of visually graded boards from turkish fir and black pine by nondestructive and destructive tests

Research on Lateral Resistance Performance of Prestressed Cross-Laminated Timber–Concrete Composite Structures under Reciprocating Loads

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