The withdrawal resistance of a nail driven into the end grain of a wood member i
ID: 1714605 • Letter: T
Question
The withdrawal resistance of a nail driven into the end grain of a wood member is. A. Lower than the withdrawal resistance when driven into the side grain. B. The same as the withdrawl resistance when driven into the side grain. C. Greater than thewithdrawl resistance when driven into the side grain. D. Greater than the shear resistance. Which of the following effects could be attributed to longitudinal shrinkage of members in wood-framed buildings? L.Unequal vertical movements at different points Il. Cracking of plaster III. Cracking of glass IV. Opening up of joists A. I and II only B. I, II and IlI only C. I1, III, and IV only D. I, I1, III, and IV In the detail shown, the wood members are loaded in A. ension perpendicular to the grain. B. tension parallel to the grain C. compression parallel to the grain D. horizontal shearExplanation / Answer
1. A
The extraction resistance of a nail driven into the ending grain of a wooden menber is lesser than the extraction resistance when motivated into the side grain.
The withdrawal resistance is the most, when the nails are driven perpendicular to the grain of the wood, i.e through side grain.
When nails are drive into the end grain, i.e parallel to the wood fibres, the extraction resistance reduced by the 50-75% compared to the extraction resistance when driven into a side grain.
2. D
The effects of the longitudinal reduction are uneven vertical activities at dissimilar points, cracking of the plaster, glass and the opening up of joists.
3. B
In detail shown, wooden members are loaded in the stress parallel to the grain, because it is loaded through the end grain.
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