Truss Design Module HelpSteel design criteria for AS 4100 -1998 Steel design criteria for AS 4100 -1998 In this worksheet the parameters needed for steel design according to AS 4100 are provided: General parameters RSC (Residual stress category) BHA (Bolt holes area) Moment amplification Betam33 Betam22 Bending FLR (Full Lateral restraint) RA Top (Restraint arrangement top) RA Bot (Restraint arrangement bottom) LLP (Load longitudinal position) LHP (Load height position) LRR Top (Top ends with lateral rotation restraints) Lb Top (Top unbraced length for bending) Lb Bot (Bottom unbraced length for bending) Shear s (Spacing between stiffeners) Axial tension kt Combined actions lz RSC (Residual stress category)BHA (Bolt holes area)Area of bolts holes that reduce the section gross area according to Clause 6.2.1 (axial compression) and 7.2 (axial tension).Betam33Ratio of the smaller to the larger bending moment about major principal axis at the ends of the member, taken as positive when the member is bent in reverse curvature. This value is calculated by default according to Clause 4.4.2.2.Betam22Ratio of the smaller to the larger bending moment about minor principal axis at the ends of the member, taken as positive when the member is bent in reverse curvature. This value is calculated by default according to Clause 4.4.2.2.FLR (Full Lateral restraint)RA Top (Restraint arrangement top)RA Bot (Restraint arrangement bottom)LLP (Load longitudinal position)LHP (Load height position)LRR Top (Top ends with lateral rotation restraints)Lb Top (Top unbraced length for bending)Lb Bot (Bottom unbraced length for bending)s (Spacing between stiffeners)ktSets the correction factor for distribution forces in a tension member according to Clause 7.3. Its value may be obtained from Table 7.3.2.lzSets the distance between partial or full torsional restraints used to determine the combined actions out of plane capacity according to Clause 8.4.4.1.