Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Residual Strength Estimation of Decayed Wood by Insect Damage through in Situ Screw Withdrawal Strength and Compression Parallel to the Grain Related to Density

  • Received : 2021.03.22
  • Accepted : 2021.07.21
  • Published : 2021.11.25
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Abstract

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.

Keywords

Acknowledgement

This research was supported by Daegu University Research Grant 2017.

References

  1. Ahn, K.S., Pang, S.J., Oh, J.K. 2021. Prediction of withdrawal resistance of single screw on Korean wood products. Journal of the Korean Wood Science and Technology 49(1): 93-102. https://doi.org/10.5658/WOOD.2021.49.1.93
  2. Kim, G.C., Kim, J.K. 2020. Changes in mechanical properties of wood due to 1 year outdoor exposure. Journal of the Korean Wood Science and Technology 48(1): 12-21. https://doi.org/10.5658/WOOD.2020.48.1.12
  3. Bodig, J., Jayne, B.A. 1982. Mechanics of wood and wood Composites. Van Nostrand Reinhold Com, pp. 712.
  4. Cruz, H., Machado, J.S. 2013. Effects of beetle attack on the bending and compression strength properties of pine wood. Advanced Materials Research 778: 145-151. https://doi.org/10.4028/www.scientific.net/amr.778.145
  5. Fakopp Enterprise Bt. 2018. Users guide- Screw resistance meter.
  6. Gilfillan, J.R., Gilbert, S.G. 2001. Development of a technique to measure the residual strength of woodworm infested timber. Construction and Building Materials 15(7): 381-388. https://doi.org/10.1016/S0950-0618(01)00004-6
  7. Hwang, S.W., Tazuru, S., Sugiyama, J. 2020, Wood identification of historical architecture in Korea by synchrotron X-ray microtomography-based three-dimensional microstructural Imaging. Journal of the Korean Wood Science and Technology 48(3): 283-290. https://doi.org/10.5658/WOOD.2020.48.3.283
  8. Iniguez-Gonzalez, G., Monton, J., Arriaga, F., Segues, E. 2015. In-situ assessment of structural timber density using non-destructive and semi-destructive testing. BioResources 10(2): 2256-2265.
  9. Iniguez, G., Arriaga, F., Esteban, M., Bobadilla, I., Gonzalez, C., Martinez, R. 2010. In situ non- destructive density estimation for the assessment of exiting timber structures. Proceeding of WCTE 2010.
  10. Jasienko, J., Nowak, T. Hamrol, K. 2013. Selected methods of diagnosis of historic timber structures: principles and possibilities of assessment. Advanced Materials Research 778: 225-232. https://doi.org/10.4028/www.scientific.net/AMR.778.225
  11. Kasal, B, Anthony, R.W. 2004. Advances in in situ evaluation of timber structures. Progress in Structural Engineering and Materials. John Wiley & Sons Ltd. London. UK 6(2): 94-103.
  12. Kloiber, M., Tippner, J. Tippner, Hrivnak, J. 2014. Mechanical properties of wood examined by semi-destructive devices. Materials and Structures 47(1-2): 199-212. https://doi.org/10.1617/s11527-013-0055-z
  13. Korean Standard Association. 2019. Determination of nail and screw withdrawal resistance for wood under axial load. KS F ISO 9087.
  14. Korean Standard Association. 2020. Method of compression test for wood. KS F 2206.
  15. Lee, H.W., Jang, S.S., Kang, C.W. 2021. Evaluation of withdrawal resistance of screw-type fasteners depending on lead-hole size, grain direction, screw size, screw type and species. Journal of the Korean Wood Science and Technology 49(2): 181-190 https://doi.org/10.5658/WOOD.2021.49.2.181
  16. Mizumoto, S. 1966. The effect of decay caused by Gloeophyllum trabeum on the strength properties of Japanese red pine sapwood. Journal of the Japan Wood Research Society 48(1): 7-11.
  17. Nunes. L., Parracha, J.L., Paria, Palma, P. 2019. Towards an assessment tool of anobiid damage of pine timber structures. Proceedings of IABSE Symposium 2019 Guimaraes Towards a Resilient Built Environment - Risk and Asset Management 1734-1741.
  18. Oh, S.C. 2020. Comparison of ultrasonic velocities between direct and indirect methods on 30 mm × 30 mm spruce lumber. Journal of the Korean Wood Science and Technology 48(4): 562-568. https://doi.org/10.5658/WOOD.2020.48.4.562
  19. Park, Y., Han Y., Park, J.H., Chung, H., Kim, H., Yang, S.Y., Chang, Y.S., Yeo, H. 2018. Evaluation of deterioration of Larix kaempferi wood heat-treated by superheated steam through field decay test for 12 Months. Journal of the Korean Wood Science and Technology 46(5): 497-510. https://doi.org/10.5658/WOOD.2018.46.5.497
  20. Parracha, J.L., Pereira, M.F.C., Mauricio, A., Machado, J.S., Faria, P., Nunes, L. 2019. A semi-destructive assessment method to estimate the residual strength of maritime pine structural elements degraded by anobiids. Materials and Structures 52(3): 1-11. https://doi.org/10.1617/s11527-018-1302-0
  21. Riggio, M.R., Anthony, W., Augelli, F., Kasal, B., Lechner, T., Muller, W., Tanner, T. 2014. In situ assessment of structural timber using non-destructive techniques. Materials and Structures 47(5): 749-766. https://doi.org/10.1617/s11527-013-0093-6
  22. Ross, R.J., Pellerin, R.F. 1994. Non-destructive testing for assessing wood members in structures: A review. Forest Products Laboratory General technical report FPL GTR-70, pp. 42.
  23. Sousa, H.S., Branco, J.M., Lourenco, P.B. 2014. Characterization of cross sections from old chestnut beams weakened by decay. International Journal of Architectural Heritage 8(3): 436-451. https://doi.org/10.1080/15583058.2013.826303
  24. Stalnaker J.J., Harris, E. 1997. Structural Design in Wood. 2nd Ed. Kluwer Academic Publisher, pp. 459.
  25. Suprapt, S., Djarwanto, Dewi, L.M. 2020. Determining the wood (Parashorea spp.) decaying and metal corroding abilities of eight fungi. Journal of the Korean Wood Science and Technology 48(1): 50-60. https://doi.org/10.5658/WOOD.2020.48.1.50
  26. Tannert, T. Anthony, R. W., Kasal, B., Kloiber, M., Piazza, M., Riggio, M., Rinn, F., Widmann, R., Yamaguchi, N. 2014. In situ assessment of structural timber using semi-destructive techniques. Materials and Structures 47(5): 767-785. https://doi.org/10.1617/s11527-013-0094-5
  27. Yamaguchi, N. 2013. In situ assessment method of wood using normalized withdrawal resistances of metric-screw type probes. Advanced Material Research 778: 217-224. https://doi.org/10.4028/www.scientific.net/AMR.778.217