[논문]Residual Strength Estimation of Decayed Wood by Insect Damage through in Situ Screw Withdrawal Strength and Compression Parallel to the Grain Related to Density

OH, Sei Chang

doi:10.5658/wood.2021.49.6.541

Residual Strength Estimation of Decayed Wood by Insect Damage through in Situ Screw Withdrawal Strength and Compression Parallel to the Grain Related to Density 원문보기

목재공학 = Journal of the Korean wood science and technology, v.49 no.6, 2021년, pp.541 - 549

OH, Sei Chang (Department of Forest Resources, Daegu University)

Abstract ▼ AI-Helper

This paper reports a method to evaluate the residual strength of insect-damaged radiata pine lumber, such as the screw withdrawal strength as a semi-destructive method and a compression parallel to the grain test to assess the density changes after exposure to outdoor conditions. The screw withdrawal strength test was used as a semi-destructive method to estimate the residual density of decayed lumber. A compression parallel to the grain test was applied to evaluate the residual density. Three variables, such as the screw withdrawal strength, compression parallel to the grain, and residual density, were analyzed statistically to evaluate their relationships. The relationship between the residual density and screw withdrawal strength showed a good correlation, in which the screw withdrawal strength decreased with decreasing density. The other relationship between the residual density and compression parallel to the grain was also positively correlated; the compression parallel to the grain strength decreased with decreasing density. Finally, the correlation between the three variables was statistically significant, and the mutual correlation coefficients showed a strong correlation between the three variables. Hence, these variables are closely correlated. The test results showed that the screw withdrawal strength could be used as a semi-destructive method for an in situ estimation of an existing wood structure. Moreover, the method might approximate the residual density and compression parallel to the grain if supplemented with additional data.

주제어

표/그림 (10)

그림 Fig.1. Samples: (a) exposed state; (b) cross section of samples after the first cut; (c) cutting region and sample dimension (unit; mm).
그림 Fig. 2. Compression parallel to the grain (a) and in situ screw withdrawal test (b).
표 Table 1. Average moisture content and density
그림 Fig. 3. Relationship between the compression strength parallel to the grain and density.
그림 Fig. 4. Percentage of the failure type of decayed wood samples (a) and main failure types of samples in compression parallel to the grain (b). (C, crushing; W, wedge splitting; Sh, shearing; Sp, splitting; C&S, crushing & splitting; Br/Er, brooming or end rolling)
표 Table 2. Test results of compression parallel to the grain
그림 Fig. 5. Relationship between the screw withdrawal strength and density.
표 Table 3. Average of screw withdrawal strength of the tested samples
그림 Fig. 6. Correlation between screw withdrawal strength and density.
표 Table 4. Statistical analysis of the correlation between the three variables

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