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Wood - Fastening


Quiz Questions

1.The strength and stability of any structure depend heavily on the fastenings that hold its parts together.
True
False
2. What does LRFD stand for?
Load and Resistance for Factor Design
Lumber and Resistance for Factor Design
Load Resistance for Factor Development
None of the above
3.Nails are the most common mechanical fastenings used in wood construction
True
False
4.What does figure 7-2 illustrate about?
(Refer Pg 7-1)
Various types of nails
Steel Side Plates
Metal Plate Connectors
None of the above
5.The resistance of a nail shank to direct withdrawal from a piece of wood depends on the density of the wood, the diameter of the nail, and the depth of penetration.
True
False
6.The surface condition of nails is frequently modified during the manufacturing process to improve withdrawal resistance.

True
False
7.The form and magnitude of the deformations along the shank does not influence the performance of the nails in various wood species.
True
False
8.Fasteners with properly applied nylon coating tend to retain their initial resistance to withdrawal compared with other coatings, which exhibit a marked decrease in withdrawal resistance within the first month after driving.
True
False
9.In dry or green wood, a clinched nail provides 45% to 170% more withdrawal resistance than an unclinched nail when withdrawn soon after driving.
True
False
10.The nailing characteristics of plywood are not greatly different from those of solid wood except for plywood’s greater resistance to splitting when nails are driven near an edge.
True
False
11.The resistance of nails to withdrawal is generally lowest when they are driven perpendicular to the grain of the wood.
True
False
12.As a general rule, nails should be driven no closer to the edge of the side member than one-half its thickness and no closer to the end than the thickness of the piece.
True
False
13.The load in lateral resistance varies approximately as the 3/2 power of the diameter when other factors, such as quality of metal, type of shank, and depth of penetration, are similar to nails.
True
False
14.What does figure 7-5 illustrate about?
(Refer Pg 7-9)

Common types of wood screws
Steel Side Plates
Metal Plate Connectors
None of the above
15.Deformed-shank nails carry somewhat lower minimum lateral loads than do the same pennyweight common wire nails, but both perform different at small distortions in the joint.
True
False
16.The resistance of wood screw shanks to withdrawal from the side grain of seasoned wood varies directly with the square of the specific gravity of the wood.
True
False
17.The proportional limit loads obtained in tests of lateral resistance for wood screws in the side grain of seasoned wood are given by the empirical equation
p = KD2
What does D mean in the above formula?
Diameter of the screw shank
Design formula
Design value of the screw
None of the above
18.Lag screws are commonly used because of their convenience, particularly where it would be difficult to fasten a bolt or where a nut on the surface would be objectionable.
True
False
19.What does figure 7-10 illustrate about?
(Refer Pg 7-12)
Multiplication factors for loads computed from Equation
A, Clean-cut, deep penetration of thread
Scholten nomograph
None of the above
20.The bearing stress under a bolt is computed by dividing the load on a bolt by the product LD, where L is the length of a bolt in the main member and D is the bolt diameter.
True
False
21.Both the properties of the wood and the quality of the bolt are factors in determining the strength of a bolted joint.
True
False