AISC LRFD 1.pdf

SYMBOLSxixS eff Effective section modulus about major axis, in. 3 (mm 3 ) . . . . . . App. F1S xt , S xc Elastic section modulus referred to tension and compressionflanges, respectively, in. 3 (mm 3 ) . . . . . . . . . . . . . . . . . . . App. F1T Tension force due to service loads, kips (N) . . . . . . . . . . . . J3.9T b Specified pretension load in high-strength bolt, kips (N) . . . . . . J3.9T u Required tensile strength due to factored loads, kips (N). . . . . . J3.9U Reduction coefficient, used in calculating effective net area . . . . B3V n Nominal shear strength, kips (N) . . . . . . . . . . . . . . . . . . F2.2V u Required shear strength, kips (N) . . . . . . . . . . . . . . . . . . App. G4W Wind load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Comm. A4X 1 Beam buckling factor defined by Equation F1-8 . . . . . . . . . . F1.2X 2 Beam buckling factor defined by Equation F1-9 . . . . . . . . . . F1.2Z Plastic section modulus, in. 3 (mm 3 ) . . . . . . . . . . . . . . . . . F1.1a Clear distance between transverse stiffeners, in. (mm) . . . . . . . App. F2.2a Distance between connectors in a built-up member, in. (mm) . . . E4a Shortest distance from edge of pin hole to edge of membermeasured parallel to direction of force, in. (mm) . . . . . . . . . . D3a r Ratio of web area to compression flange area . . . . . . . . . . . App. G2a Weld length, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . B10b Compression element width, in. (mm) . . . . . . . . . . . . . . . B5.1b e Reduced effective width for slender compression elements,in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App. B5.3b eff Effective edge distance, in. (mm) . . . . . . . . . . . . . . . . . . D3b f Flange width, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . B5.1b s Stiffener width for one-sided stiffeners, in. (mm) . . . . . . . . . C3.4c 1 , c 2 , c 3 Numerical coefficients . . . . . . . . . . . . . . . . . . . . . . . I2.2d Nominal fastener diameter, in. (mm) . . . . . . . . . . . . . . . . J3.3d Overall depth of member, in. (mm) . . . . . . . . . . . . . . . . . B5.1d Pin diameter, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . D3d Roller diameter, in. (mm) . . . . . . . . . . . . . . . . . . . . . . J8.2d L Depth at larger end of unbraced tapered segment, in. (mm) . . . . App. F3d b Beam depth, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . K1.7d b Nominal diameter (body or shank diameter), in. (mm) . . . . . . . App. K3.3d c Column depth, in. (mm). . . . . . . . . . . . . . . . . . . . . . . K1.7d o Depth at smaller end of unbraced tapered segment, in. (mm) . . . App. F3e Base of natural logarithm = 2.71828. . . . . . . . . . . . . . . . . Comm. E2f Computed compressive stress in the stiffened element, ksi (MPa) . App. B5.3f b1 Smallest computed bending stress at one end of a taperedsegment, ksi (MPa) . . . . . . . . . . . . . . . . . . . . . . . . . App. F3f b2 Largest computed bending stress at one end of a taperedsegment, ksi (MPa) . . . . . . . . . . . . . . . . . . . . . . . . . App. F3f c Specified compressive strength of concrete, ksi (MPa) . . . . . . . I2.2f o Stress due to 1.2D + 1.2R, ksi (MPa) . . . . . . . . . . . . . . . . App. K2f un Required normal stress, ksi (MPa) . . . . . . . . . . . . . . . . . H2f uv Required shear stress, ksi (MPa) . . . . . . . . . . . . . . . . . . H2f v Required shear stress due to factored loads in bolts or rivets,ksi (MPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J3.7g Transverse center-to-center spacing (gage) between fastenergage lines, in. (mm) . . . . . . . . . . . . . . . . . . . . . . . . . B2h Clear distance between flanges less the fillet or corner radius forLRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION