Characteristic Evaluation of Bending Strength Distributions on Revised Korean Visual Grading Rule

방성준,; 오정권,; 박천영,; Park, Joo-Saeng; 박문재,; 이전제,

doi:10.5658/wood.2011.39.1.1

Cited by 8 publications

(3 citation statements)

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“…As such, 50 MPa were applied as the Fb, which was the approximate bending strength value of Larix kaempferi Carr. (Pang et al 2011). Next, the γ value for the concrete and CLT combined with the epoxy adhesive was considered to behave as a full composite, so it was set to 1.…”

Section: 𝛾-Methodsmentioning

confidence: 99%

Evaluation of the bending performance of glued CLT-concrete composite floors based on the CFRP reinforcement ratio

Song

Baek

et al. 2022

BioRes

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A study was conducted on the reinforcement of cross-laminated timber (CLT) concrete composite floors with carbon fiber reinforced plastic (CFRP) to improve its mechanical performance and reliability in wood composite structures. A four-point bending test evaluation was completed on three types of cross-laminated timber concrete composite floors produced with different carbon fiber reinforced plastic reinforcement ratios (33%, 66%, and 100%) on the entire surface of the tensile portion. An increase in the carbon fiber reinforced plastic reinforcement ratio of the composite floors led to an increased bending capacity and a slightly improved yield performance. In the case of a composite floor with a reinforcement ratio of 33%, premature failure occurred in the elastic region due to defects of the CLT such as knots and slopes of the grain. Failure mode analysis revealed that tensile and shear failure coexist when the composite floor has a CFRP reinforcement ratio of 33%. In contrast, reinforcement ratios of 66% and 100% prevented premature failures in the elastic region caused by defects and induced a consistent failure mode. These reinforcement effects reduced the variability in the increased bending capacity of the composite floors and improved the accuracy of the theoretical prediction design via the γ-method. Meanwhile, the shear connections between the cross-laminated timber and concrete via epoxy adhesive exhibited full-composite behavior without being affected by the reinforcement ratio.

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Section: 𝛾-Methodsmentioning

confidence: 99%

Evaluation of the bending performance of glued CLT-concrete composite floors based on the CFRP reinforcement ratio

Song

Baek

et al. 2022

BioRes

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show abstract

“…Association 2001). After, the samples were classified into four grades by visual strength grading (Grade-1–Grade-4) following the provisions given in KS F 3021.2013 (Pang et al 2011; K.S. Association 2013).…”

Section: Methodsmentioning

confidence: 99%

Improved bending strength of Douglas fir (Pseudotsuga menziesii) timber relative to Japanese larch (Larix kaempferi Carr) grown in Korea

Jang

Kang

Kolya

2021

International Wood Products Journal

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Small-diameter logs are intended to function as high-value structural timber. Bending strength properties is an essential phenomenon for structural lumber. Herein, the modulus of elasticity, the modulus of rupture and the allowable bending stress (ABS) of domestic (Korea) small and large-diameter larch and large diameter Douglas fir timber were measured and compared according to the standard of ASTM D 2915. Samples were visually graded as Grade 1 to Grade 4 following the provisions included in KS F 3021.2013. The large-diameter Douglas fir timber (Grade 1 to Grade 4) exhibited the highest MOE value, but in Grade 4, it showed the lowest MOR value compared with the small and large diameter of larch timber. The ABS of small-diameter larch was 12.0 MPa, higher relative to KBC 2009 Grade 1 structural lumber (8.0 MPa). The ABS of large-diameter of larch and Douglas fir timber exhibited 15.5 and 18.1 MPa, respectively.

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“…The compressive strengths of laminas are required to predict the compressive resistance of the CLT. Several researchers [15][16][17][18] investigated to find suitable parametric models for representing strength properties of Korean species. Two parameter (2P) weibull distribution was revealed as a suitable model and Oh et al [8] and Pang et al [19] used this model to generate the compression and tensile strength of larch laminas.…”

Section: Generation Of the Lamina Compressive Strengthmentioning

confidence: 99%

Load sharing and weakest lamina effects on the compressive resistance of cross-laminated timber under in-plane loading

Pang

Jeong

2018

J Wood Sci

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A new approach was developed to predict the compressive resistance of cross-laminated timber (CLT) using the compressive strength of small samples of different grade lamina from E12 and E8 larch, and E10 and E6 nut pine. CLT of three different thicknesses was manufactured using different grades of laminas from each species. To evaluate the compressive resistance of CLT, three different methods were employed. The first method was used to determine the compressive resistance, which was predicted by multiplying the compressive strength of lamina aligned with the loading direction, and the cross-sectional areas of the lamina. The second method is similar to the first method, but additionally considering the stiffness ratio of the laminas. The third method developed from the current study accounts for load sharing and weakest lamina effects in the prediction of compressive resistance. When the lower 5th percentile compressive resistance in a major direction was predicted using the first two methods, the difference between the experimental test and the predicted value ranged from 2.5 to 43.4%. However, when the compressive resistance in a major direction was predicted using the developed method from the current study, the difference between the experimental test and predicted value ranged from − 8.7 to 10.8%.

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Characteristic Evaluation of Bending Strength Distributions on Revised Korean Visual Grading Rule

Cited by 8 publications

References 0 publications

Evaluation of the bending performance of glued CLT-concrete composite floors based on the CFRP reinforcement ratio

Evaluation of the bending performance of glued CLT-concrete composite floors based on the CFRP reinforcement ratio

Improved bending strength of Douglas fir (Pseudotsuga menziesii) timber relative to Japanese larch (Larix kaempferi Carr) grown in Korea

Load sharing and weakest lamina effects on the compressive resistance of cross-laminated timber under in-plane loading

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