Determination of shear modulus on construction size timber

被引：45

作者：

Divos F. ^{[1
]}

Tanaka T. ^{[2
]}

Nagao H.

Kato H. ^{[3
]}

机构：

[1] University of Sopron, P.O. Box 132

[2] Forest. and Forest Prod. Res. Inst., P.O. Box 16, Tsukuba

[3] Timber Laboratory, Forest. and Forest Prod. Res. Inst., Tsukuba

来源：

Wood Science and Technology | 1998年 / 32卷 / 6期

关键词：

Shear Modulus; Timber; Torsional Vibration; Frequency Determination; Industrial Environment;

D O I：

10.1007/BF00702796

中图分类号：

学科分类号：

摘要：

Shear modulus determination of construction size timber was examined. Three different Techniques were used: torsional vibration, simultan E&G, and variation of span technique. We found that the simultan E&G technique is quite sensitive to the error of natural frequency determination and provides only an estimate for G. Better shear modulus determinations are the static and torsional techniques, but the torsional technique is most precise. The torsional vibration technique can be a good solution for shear modulus determination in an industrial environment because it provides quick and precise etermination, but standardization of the method would first be necessary. We found a high correlation coefficient (0.80) between the screw withdrawal resistance and shear modulus of 2 by 4 timber. Based on this result it is possible to estimate the shear modulus of timber even if the timber is installed in a structure.

引用

页码：393 / 402

页数：9

共 11 条

[1]

Standard Method of Static Tests of Timbers in Structural Size (1984) Annual Books of ASTM Standards, Section 4, Construction, , volume 04.09 Wood

[2]

Chui, Y.H., Smith, I., Influence of rotary inertia and shear deformation and support condition on natural frequencies of wooden beams (1989) Wood Sci. Technol., 24, pp. 233-245

[3]

Divos, F., Screw Withdrawal Force as Strength Predictor (1994) Proc. First Europen Symposium on Nondestructive Evaluation of Wood, p. 531. , Sopron, Hungary

[4]

(1995) Timber Structures - Structural Timber and Glued Laminated Timber - Determination of Some Physical and Mechanical Properties

[5]

Hammersley, J.M., (1964) Monte Carlo Methods, , Methuen, London

[6]

Hearmon, R.F.S., Vibration Testing of Wood (1966) Forest Prod. J., 16 (8), pp. 29-40

[7]

Perstorper, M., (1994) Quality of Structural Lumber, , Chalmers University, Department of Structural Engineering, Thesis, Goteborg, Sweden

[8]

Schneider, H., Verfahren zur Berechnung von Elastizitats- und Schubmodul aus Eigenfrequenzen stabförmiger Proben (1966) Materialprüf., 8 (5), pp. 169-174

[9]

Tanaka, T., Nagao, H., Nakai, T., Nondestructive evaluation of bending and tensile strength by longitudinal and transverse vibration of lumber (1991) Proc. 8th International Symposium on Nondestructive Testing of Wood, , Washington State university, Pullman, USA

[10]

Timoshenko, S., (1954) Vibration Problems in Engineering, , Van Nostrand, New York

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