AISC LRFD 1.pdf

xxSYMBOLSrolled shapes; and for built-up sections, the distance betweenadjacent lines of fasteners or the clear distance between flangeswhen welds are used, in. (mm) . . . . . . . . . . . . . . . . . . . B5.1h Distance between centroids of individual components perpendicularto the member axis of buckling, in. (mm). . . . . . . . . . . . . . E4h c Twice the distance from the centroid to the following: the insideface of the compression flange less the fillet or corner radius, forrolled shapes; the nearest line of fasteners at the compression flangeor the inside faces of the compression flange when welds are used,for built-up sections, in. (mm) . . . . . . . . . . . . . . . . . . . B5.1h o Distance between flange centroids, in. (mm) . . . . . . . . . . . . C3h r Nominal rib height, in. (mm) . . . . . . . . . . . . . . . . . . . . I3.5Factor used in Equation A-F3-6 for web-tapered members. . . . . App. F3h sh wFactor used in Equation A-F3-7 for web-tapered members. . . . . App. F3j Factor defined by Equation A-F2-4 for minimum moment ofinertia for a transverse stiffener . . . . . . . . . . . . . . . . . . . App. F2.3k Distance from outer face of flange to web toe of fillet, in. (mm) . . K1.3k v Web plate buckling coefficient . . . . . . . . . . . . . . . . . . . App. F2.2l Laterally unbraced length of member at the point of load, in. (mm) B7l Length of bearing, in. (mm). . . . . . . . . . . . . . . . . . . . . J8.2l Length of connection in the direction of loading, in. (mm). . . . . B3l Length of weld, in. (mm) . . . . . . . . . . . . . . . . . . . . . . B3m Ratio of web to flange yield stress or critical stress in hybridbeams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App. G2n Number of nodal braced points within the span . . . . . . . . . . C3n Threads per inch (per mm) . . . . . . . . . . . . . . . . . . . . . App. K3.4r Governing radius of gyration, in. (mm) . . . . . . . . . . . . . . . B7r To For the smaller end of a tapered member, the radius of gyration,considering only the compression flange plus one-third of thecompression web area, taken about an axis in the plane of the web,in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App. F3.4r ir ibr mr or ox , r oyr x , r yr ycsMinimum radius of gyration of individual component in a built-upmember, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . E4Radius of gyration of individual component relative to centroidalaxis parallel to member axis of buckling, in. (mm) . . . . . . . . . E4Radius of gyration of the steel shape, pipe, or tubing in compositecolumns. For steel shapes it may not be less than 0.3 times theoverall thickness of the composite section, in. (mm) . . . . . . . . I2Polar radius of gyration about the shear center, in. (mm). . . . . . E3Radius of gyration about x and y axes at the smaller end of atapered member, respectively, in. (mm). . . . . . . . . . . . . . . App. F3.3Radius of gyration about x and y axes, respectively, in. (mm) . . . E3Radius of gyration about y axis referred to compression flange, orif reverse curvature bending, referred to smaller flange, in. (mm) . App. F1Longitudinal center-to-center spacing (pitch) of any two consecutiveholes, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . B2t Thickness of element, in. (mm) . . . . . . . . . . . . . . . . . . . B5.1t HSS design wall thickness, in. (mm) . . . . . . . . . . . . . . . . B5.1t f Flange thickness, in. (mm) . . . . . . . . . . . . . . . . . . . . . B5.1t f Flange thickness of channel shear connector, in. (mm). . . . . . . I5.4LRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION