11.7 c and d Use the appropriate expressions from Example 11.4 to compute the dowel bear- ing strengths for the fo...

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11.7 c and d

Use the appropriate expressions from Example 11.4 to compute the dowel bear- ing strengths for the following lag bolt (lag screw) connections. Compare the results with values in NDS Table 11.3.2. a. %-in. diameter lag bolt in Southern Pine with load applied parallel to grain b. %-in.-diameter lag bolt in Southern Pine with load applied perpendicular to 11.7 grain c. d·28-in.-diameter lag bolt in DF-L with load applied parallel to grain s-in-diameter lag bolt in Southern Pine with angle of load to grain of 55 degrees e. %-in.-diameter lag bolt in DF-L with load applied perpendicular to grain f. ⅝-in.-diameter lag bolt in DFL with angle of load to grain of 45 degrees

EXAMPLE 11.4 Formulas for Dowel Bearing Strength Numerical values of dowel bearing strength are listed in the NDS Sawn lumber and glulam Plywood and OSB NDS Table 11.3.2 NDS Table 11.3.2B

LARGE DIAMETER FASTENER SMALL DOWEL WooD MEMBER ее Fell-PARALLEL TO GRAIAN Fe PERPENDICULAR TO GRAIAN ee - ANGLE TO GRAIN θ -ANY ANGLE TO GRAIN LARGE DOWELS SMALL DOWELS Figure 11.5 Definition of dowel bearing strength depends on relative size of fas- tener. The dowel bearing strength F, for large-diameter fasteners is a function of angle of load to grain. Specific gravity and diameter are also important. The F, for small-diameter fasteners depends only on specific gravity The values in the NDS tables are based on the following expressions: LARGE DOWELS (D 2 0.25 in.): Parallel-to-grain loading: F 11,200(G) Perpendicular-to-grain loading: Fi 6100(G145) The Hankinson formula gives Fe at an angle of load to grain θ See Fig. 11.5 Fee = Felsin ell Fe1 SMALL DOWELS (D2 0.25 in.): All angles of load to grain: F. 16,600 G14 where F-dowel bearing strength; subscripts ll, l, and θ indicates strengths parallel to grain, perpendicular to grain, and at an angle to G- specific gravity (dry) of wood member D - diameter of dowel-type fastener

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11.7 c and d Use the appropriate expressions from Example 11.4 to compute the dowel bear- ing strengths for the fo...

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11.7 c and d Use the appropriate expressions from Example 11.4 to compute the dowel bear- ing strengths for the fo...

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Wood Timber Design Use the appropriate expressions from Example 11.4 to compute the dowel bea ing strengths for th...

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11.7 c and d Use the appropriate expressions from Example 11.4 to compute the dowel bear- ing strengths for the fo...