AISC LRFD 1.pdf

115App. JAPPENDIX JCONNECTIONS, JOINTS, AND FASTENERSAppendix J2.4 provides the alternative design strength for fillet welds. Appendices J3.8and J3.9 pertain to the design of slip-critical connections using service loads.J2. WELDS4. Design StrengthIn lieu of the constant design strength for fillet welds given in Table J2.5, the followingprocedure is permitted.(a) For a linear weld group loaded in-plane through the center of gravity, thedesign strength is fFwAwwhereF w1.5= 0.60F EXX1.0 + 0.50 sin q(A-J2-1) = 0.75F EXX = electrode classification number, i.e., minimum specified strength, ksi(MPa) = angle of loading measured from the weld longitudinal axis, degreesA w = effective area of weld throat, in. 2 (mm 2 )(b) For weld elements within a weld group that are loaded in-plane and analyzedusing an instantaneous center of rotation method, the components of the designstrength are F wx A w and F wy A w ,whereF wx = SF wixF wy = SF wiy15 .F wi = 060 . FEXX (. 10+ 050 . sin q) f( p)03f( p)= [ p( 19 . - 09 . p)] .f = 0.75F wi = nominal stress in any ith weld element, ksi (MPa)F wix = x component of stress F wiF wiy = y component of stress F wip = Di/ Dm, ratio of element i deformation to its deformation at maximumstress-D m = 0. 209( 2) 032 .q+ w, deformation of weld element at maximum stress,in. (mm)= deformation of weld elements at intermediate stress levels, linearlyD i( )LRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION