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1、CHAPTER 1 GENERAL1.1 Scope of ApplicationThis Standard applies to the structural design of steel buildings. The Standard, however, need not apply to structural designs based on special research studies.1.2 Structural Safety Verification TestsWhere a design in involves connection and other structural
2、 details not expressly prescribed in this Standard, the structural safe& of such details shall be proved by tests or by other appropriate means.1.3 Enlargement of SectionSections of various structural elements shall be enlarged as required, with due consideration for practical limitation in precisio
3、n of structural designs, inadequacy in constructional workmanship, and such adverse factors as rusting, corrosion and wear of steel materials.1.4 NomenclatureAGross sectional area; nominal body area of a high-strength bolt; or sum of sectional areas of column components (mm2)ANNet section (mm2)AdSec
4、tional area of lacing element; or total sectional area of a pair of lacing elements in the case of double lacing (mm2)AfCross-sectional area of compression flange; or cross-sectional area of either flange (mm2)ApSectional area of parts in contact (mm2)AsCross-sectional area of vertical or horizontal
5、 stiffeners (mm2)AwCross-sectional area of web plate (mm2)aEquivalent area loss due to rivet, bolt or high-strength bolt holes(mm2); or spacing of intermediate stiffeners (mm)a0Net area loss due to rivet, bolt or high-strength bolt holes (mm2)bWidth of compression element free at one edge and fixed
6、at the other; width of rocker or roller; or longitudinal spacing or pitch of consecutive holes (mm) , but not larger than 2.3Bending coefficient dependent upon moment gradientDNominal outside diameter of steel pipe; or outside diameter of main steel pipe (mm)dWidth of element stiffened along two edg
7、es; outside diameter of branch pipe; width of web plate; or diameter of pin (mm)d1Minimum width of the portion of web plate divides by vertical or horizontal stiffener (mm)EModulus of elasticity (N/mm2)eDistance between axes of gravity of components (mm)FBasic value used in determining allowable str
8、esses (N/mm2) (N/mm2)fAllowable stress in members subject to repeated stress variation (N/mm2)fbAllowable bending stress (N/mm2)fb1Allowable bending stress in bearing plates and similar elements subject to out-of-plane bending (N/mm2)fb2Allowable bending stress in pins subject to bending (N/mm2)fcAl
9、lowable compressive stress (N/mm2)fcAllowable compressive stress in the toe of the web fillet of rolled shapes or build-up I-shaped members (N/mm2)flAllowable bearing stress in plates in riveted or bolted joints (N/mm2)fp1Allowable bearing stress for contact area of pins and for other milled surface
10、s (N/mm2)fp2Allowable bearing stress for rockers or rollers (N/mm2)fsAllowable shear stress (N/mm2)fs0Allowable shear stress for high-strength bolts (N/mm2)fstAllowable shear stress for high-strength bolts subject to combined tension and shear (N/mm2)ftAllowable tensile stress (N/mm2)ft0Allowable te
11、nsile stress for rivets or bolts (N/mm2)ftsAllowable tensile stress for rivets or bolts subject to combined tension and shear (N/mm2)gTransverse spacing between fastener gage lines (mm)hDepth of beam (mm)I0Moment of inertia of intermediate stiffeners (mm4)ILMoment of inertia of horizontal or vertica
12、l stiffener (mm4)ISRequired moment of inertia of the stiffeners on compression flanges (mm4)iRadius of gyration, taken about an axis in the plane of web, of a tee section comprising the compression flange plus one-sixth of beam depth radius of gyration of a section with respect to axis subject to bu
13、ckling; or radius of gyration of horizontal or vertical stiffeners on the web (mm)i1The least radius of gyration of sectional elements of compression members (mm)LEffective length of weld in branch connection of steel pipes (mm)lLength of member; or length of distributed load (mm)lbUnsupported lengt
14、h of compression flange (mm)ldLength of lacing element (mm)lkEffective length of compression member subject to buckling (mm)l1Spacing of separators or tie plates; or length of hole in members with cover plates having holes (mm)l2Longitudinal component of the length of lacing of a built-up member (cm
15、)MBending moment (Nmm)M1Larger bending moment about the strong axis at the end of a member (Nmm)M2Smaller bending moment about the strong axis at the end of a member (Nmm)mNumber of components or groups of components connected by lacing or tie platesNCompression (N)N1Larger compression (N)N2Smaller compression (N)nNumber of structural planes formed by lacing or tie plates in built-up members; or number of vertical or horizontal stiffenersPConcentrated transverse load or reaction; or compression for computation of bearing stress (N)pSpacing of holes (mm)QShear (N)rRadius of curvature o
