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

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Wood Timber Design
Use the appropriate expressions from Example 11.4 to compute the dowel bea ing strengths for the following bolt connections. Compare the results with th values in NDS Table 11.3.2 a, 12-in.-diameter bolt in Hem-Fir with load applied parallel to grain b. 7-in.-diameter bolt in Hem-Fir with load applied perpendicular to grain 11.6

Use the appropriate expressions from Example 11.4 to compute the dowel bea ing strengths for the following bolt connections. Compare the results with th values in NDS Table 11.3.2 a, 12-in.-diameter bolt in Hem-Fir with load applied parallel to grain b. 7-in.-diameter bolt in Hem-Fir with load applied perpendicular to grain 11.6

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

WOOD MEMBER LARGE DIAMETER FASTENER SMALL DOWEL ce FellPARALLEL TO GRAIN Fe PERPENDICULAR TO GRAIA ee - ANGLE TO GRAIN θ FE 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: Perpendicular-to-grain loading: Fi 6100(G F 11,200(G) -0 The Hankinson formula gives F, at an angle of load to grain θ See Fig. 11.5. Fe Fe FeFeS SMALL DOWELS (D2 0.25 in.): e Cos2 All angles of load to grain: F. 16,600 G1L4 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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Data from the a ven aquestfon Spectfic gravty of ttem- fir Doael bearing strengt786 aratte r ain pphed load faralle to rain 186x (6u8 1862 X6 o8888 - 4036 88 Ps

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