Statistical technique for grouping tropical timbers into similar strength groups

Abdul Wahab, M.J. and Jumaat, Mohd Zamin and Mohamad Khaidzir, M.O. (2012) Statistical technique for grouping tropical timbers into similar strength groups. Modern Applied Science, 6 (3). pp. 73-80. ISSN 1913-1852, DOI

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This paper focuses on statistical technique for the assessment of grouping tropical timbers into similar strength groups. The Student's t-test was conducted to evaluate whether the values of mean MOE in bending of two timbers are statistically different from each other. A total of 23 Malaysian hardwoods of different strength classes were assessed by comparing MOE value of one timber to the next. The assessment is limited to species of data obtained from at least 40 specimens and from at least 5 trees. However, more species can be added by conducting extra test based on the similar test procedure. The results showed that from 23 timbers evaluated, they fall into 6 different levels, indicating 6 different timber groups of similar MOE. The outcome is almost similar to the previous groupings done through different methods. The grouping will serves as a guideline for converting small size specimens' data into the equivalent structural timber test values.

Item Type: Article
Additional Information: Export Date: 6 January 2013 Source: Scopus Language of Original Document: English Correspondence Address: Wahab, M.J.A.; Forest Research Institute Malaysia, Kepong 52109, Selangor, Malaysia; email: References: Alik, D., Badorul, H.A.B., Strength Performance of Full-size Structural Timber of Dryrobalanops Species of Sarawak, Malaysia (2006) 9th World Conference Timber Engineering, , WCTE 2006; Burgess, H.J., Strength grouping of Malayan timbers (1956) Malayan Forester, 19 (1), pp. 33-36; Chu, Y.P., (1997) Timber Design Handbook, , Forest Research Institute Malaysia, Kepong, Selangor; Structural timber (2009) Strength classes, , EN 338; Structural timber (2004) Determination of characteristic values of mechanical properties and density, , EN 384; Engku Abdul Rahman, C., Basic and Grade Stresses for Some Malaysian Timbers (1971) Malayan Forester, 34 (4), pp. 131-134; Engku Abdul Rahman, C., Basic and Grade Stresses for Strength Groups of Malaysian Timbers (1972) Malayan Forester, 35 (2), pp. 131-134; Geert, R., van de Kuilen, J.W., Comparison of methods of strength classification of tropical hardwood timber (2010) Proceedings of the Eleventh World Conference on Timber Engineering, pp. 20-24. , Riva Del Garda, Italy; Mansfield-Williams, H., (2010) Assistance with a route to CE marking for Malaysian structural timber, , Report for Forest Research Institute Malaysia Kepong, Malaysia. Report reference TE//F10260. TRADA Technology Ltd; Kliger, I.R., Perstorper, M., Johansson, G., Pellicane, P.J., Quality of timber products from Norway spruce (1995) Wood Science and Technology, 29 (6), pp. 397-410. ,; Lee, Y.H., Engku Abdul Rahman, C., (1993) The Strength Properties of Some Malaysian Timbers, , Timber Trade Leaflet No.34. Forest Department, Kuala Lumpur. (Reprinted); (2001) Code of practice for structural use of timber: Part 2 - Permissible stress design of solid timber, , MS 544. (First revision); Okai, R., Frimpong-Mensah, K., Yeboah, D., Characterization of strength properties of branchwood and stemwood of some tropical hardwood species (2004) Wood Science and Technology, 38 (2), pp. 163-171. ,; Tan, Y.E., Mohamad Omar, M.K., Chong, S.Y., Mohd Jamil, A.W., Current strength grouping for structural timbers in Malaysia - its derivation? (2010) Proceedings of the International Symposium on Forestry and Forest Products 2010, pp. 5-7. , The Legend Hotel, Kuala Lumpur; Wong, T.M., (1982) A Dictionary of Malaysian Timbers, , Malayan Forest Records No. 30. Forest Department, Kuala Lumpur
Uncontrolled Keywords: CE marking, Strength group, Tropical timber.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 25 Apr 2013 01:10
Last Modified: 05 Feb 2020 04:38

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