Touch and close fasteners. Determination of longitudinal shear strength

2004 ◽  
Keyword(s):  
Shear Strength ◽  
Longitudinal Shear

Longitudinal shear strength of Douglas-fir

1976 ◽  
Vol 3 (2) ◽  
pp. 198-208 ◽  
Author(s):  
Ricardo O. Foschi ◽  
J. D. Barrett
Keyword(s):  
Shear Strength ◽  
Longitudinal Shear ◽  
Douglas Fir ◽  
Shear Stresses ◽  
Loading Conditions ◽  
Theoretical Predictions ◽  
The Difference ◽  
American Society ◽  
Shear Block

Weibull's theory of brittle fracture is applied to the determination of strength of Douglas-fir wood in longitudinal shear. Ultimate stresses, at a given survival probability, are derived for beams under different loading conditions. The theory allows an explanation for the difference in shear strength between beams and the standard American Society for Testing Materials shear block, as well as for the dependence of shear strength upon beam size. The theory is verified by comparing theoretical predictions and test results on Griplam nailed connections loaded parallel to the grain and shear tests on torque tubes. Very good agreement is shown. Finally, allowable shear stresses for beams under different loading conditions are derived.

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