AISC LRFD 1.pdf

134 DESIGN FOR CYCLIC LOADING (FATIGUE) [App. K3.DescriptionTABLE A-K3.1 (Cont’d)Fatigue Design ParametersStressCategoryConstantC fThresholdF THksi(MPa)Potential CrackInitiation PointSECTION 6 – BASE METAL AT WELDED TRANSVERSE MEMBER CONNECTIONS (cont’d)6.2 Base metal at details of equalthickness attached by complete jointpenetration groove welds subject totransverse loading with or withoutlongitudinal loading when the detailembodies a transition radius R with theweld termination ground smooth:When weld reinforcement is removed:R 24 in. (600 mm)24 in. > R 6 in.(600 mm > 150 mm)6 in. > R 2 in.(150 mm > R 50 mm)2 in. (50 mm) > RWhen weld reinforcement is notremoved:R 24 in. (600 mm)24 in. > R 6 in.(600 mm > R 150 mm)6 in. > R 2 in.(150 mm > R 50 mm)2 in. (50 mm) > R6.3 Base metal at details of unequalthickness attached by complete jointpenetration groove welds subject totransverse loading with or without longitudinalloading when the detail embodiesa transition radius R with the weldtermination ground smooth.When weld reinforcement is removed:R > 2 in. (50 mm)R 2 in. (50 mm)When reinforcement is not removed:Any radiusBCDECCDEDEE120 10 8 16(110)44 10 8 10(69)22 10 87(48)11 10 8 4.5(31)44 10 8 10(69)44 10 8 10(69)22 10 87(48)11 10 8 4.5(31)22 10 87(48)11 10 8 4.5(31)11 10 84.5(31)Near points oftangency ofradius or in theweld or at fusionboundary ormember orattachmentAt toe of theweld eitheralong edge ofmember or theattachmentAt toe of weldalong edge ofthinner materialIn weld terminationin smallradiusAt toe of weldalong edge ofthinner materialLRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION