The withdrawal resistance of a nail driven into the end grain of a wood member i
ID: 1714606 • 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? I.Unequal vertical movements at different points II. Cracking of plaster III. Cracking of glass IV. Opening up of joists A. I and II only B. I, II and III only C. II, III, and IV only D. I, II, III, and IV In the detail shown, the wood members are loaded in STEEL PLATE A. ension perpendicular to the grain. B. tension parallel to the grain C. compression parallel to the grain D. horizontal shear
Explanation / Answer
1. A
The withdrawal resistance of a nail driven into the end grain ofa awooden menber is lower than the withdrawal resistance when driven into the side grain. Withdrawal resistance is greatest when the nails are driven perpendicular to the grain of wood, i.e through the side grain. When the nails are driven into the end grain, i.e parallel to the wooden fibres, thw withdrawal resistance reduces by 50-75% compared to the withdrawal resistance when driven into the side grain.
2. D
Effects of longitudinal shrinkage are unequal vertical movements at different points, cracking of plaster, glass and opening up of joists.
3. B
In the detail shown, wood members are loaded in tension parallel to the grain, because it is loaded through the end grain.
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