![]() ![]() The applied load is the sum of the factored external loads plus the tension, if any resulting from prying action caused by deformation of connected parts. The design strength of bolts or threaded parts is Rn (tabulated in Table 7.26) applied to the nominal body area of bolts and threaded parts except upset rods (see footnote h for Table 7.26). If hardened washers are required, they should be placed over the outer surface of a plate washer or bar. Washers or bars for A325 or A490 bolts should be 5â„16 in or more thick but need not be hardened. When the slot is in an outer ply, plate washers or a continuous bar with standard holes should be installed to cover the entire slot. Long-slot holes may be used in only one ply of the connected parts at an individual faying surface. Washers, hardened when used with high-strength bolts, should be placed over oversize and short-slot holes. In slip-critical connections, slots may be formed without regard to the direction of loading but in bearing-type connections, slot length should be placed normal to the direction of loading. Oversize holes are permitted only in slip-critical connections. Table 7.25 tabulates maximum sizes for standard, oversize, and slotted bolt holes. The allowable bearing load at a bolt hole is 1.5Fudt, where Fu is the specified tensile strength, d is the nominal bolt diameter, and t = thickness of connected part. Both bearing-type and slip-critical bolted connections are proportional for the shear forces on the gross area of bolts.Īllowable tension and shear stresses for bolts are listed in Table 7.24. The load capacities specified in AISC ASD and LRFD specifications are closely related and are based on the Specification for Structural Joints Using ASTM A325 or A490 Bolts, Research Council on Structural Connections of the Engineering Foundation. Under service conditions, bolts may be loaded in tension, shear, or a combination of tension and shear. ![]()
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