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AISC LRFD 1.pdf

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138 DESIGN FOR CYCLIC LOADING (FATIGUE) [App. K3.Description8.1 Base metal at stud-type shearconnectors attached by fillet orelectric stud welding.TABLE A-K3.1 (Cont’d)Fatigue Design ParametersStressCategoryConstantC fSECTION 8 - MISCELLANEOUSThresholdF THKsi(MPa)C 44 10 8 10(69)Potential CrackInitiation PointAt toe of weld inbase metal8.2 Shear on throat of continuous orintermittent longitudinal or transversefillet welds.F 150 10 10(Eqn.A-K3.2 orA-K3.2M)8(55)In throat of weld8.3 Base metal at plug or slot welds. E 11 10 8 4.5(31)At end of weld inbase metal8.4 Shear on plug or slot welds. F 150 10 10(Eqn.A-K3.2 orA-K3.2M)8(55)At faying surface8.5 Not fully-tightened high-strengthbolts, common bolts, threaded anchorrods and hanger rods with cut, groundor rolled threads. Stress range ontensile stress area due to live loadplus prying action when applicable.E¢3.9 10 8 7(48)At the root of thethreads extendinginto the tensilestress area<strong>LRFD</strong> Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION

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