Truss Design Module HelpSteel design criteria for AISI Steel design criteria for AISI Axial tension An. Axial compression CFT Restraint L33 L22 L Torsion K33 K22 K Torsion Bending Cb33 Cb22 CLT restraint Bypass R. Span type. Attached flange User R. Shear Loc. Shear. a (Stiffeners) Combined forces Cm33 Cm22 Braced minor (Frame type 2) Braced major (Frame type 3) Web crippling Bear. L. Load. Cond. Fl. Sup. Cond. Distortional buckling (available for 2007 and 2012 versions of AISI code) Braced Buck. kPhi. Lm. An.This parameter defines the net Area of the cross section used when tensile rupture limit state applies.CFT RestraintThis options indicates whether the member has continuous torsional and flexural-torsional buckling restraint. If so, the limit state of flexural-torsional and torsional buckling (section E4) will be ignored in the compression design.L33This is the unbraced length measured between centers of gravity of the bracing members in the 3-3 (strong) axis. L33 is used for flexural buckling about the 3-3 axis. If L33 = 0, the program will assume the length L between nodes. If, for analysis, the physical member has been subdivided, the values of these parameters should reflect the real length of the member. Rigid end zones are assumed to reduce the length of the members.L22L TorsionThis is the unbraced length measured between centers of gravity of the bracing members for torsion. If Ltorsion = 0, the program will assume the length between nodes. If, for analysis, the physical member has been subdivided, the values of these parameters should reflect the real length of the member. Rigid end zones are assumed to reduce the length of the members.K33This is the effective length factor for bending about axis 3-3 (major). The objective of this variable is to calculate the axial capacity of the member considering the buckling effect. If K has its default value of (0), the program will assume a value of K=1. K22This is the effective length factor for bending about 2-2 (minor). The objective of this variable is to calculate the axial capacity of the member considering the buckling effect.K TorsionCb33The bending coefficient is used in steel design and depends on the moment gradient in the 3-3 direction. Cm22CLT restraintSets the member with continuous lateral-torsional restraint. This flag affects only the design calculations and when it is used the lateral torsional buckling (LTB) is not considered in the design.Bypass R.The check box defines or allow the member to avoid the reduction of the nominal flexural strength according to AISI design code provisions for members having one flange fastened to deck or sheathing when the member region to consider for design is between inflection points adjacent to support, or when it is a cantilever member.Span type.Parameter that defines or specifies the type of the beam span used to calculate the bending reduction factor according to AISI design code provisions for members having one flange through-fastened to deck or sheathing.Attached flangeThis parameter defines if the member has one flange through fastened to deck or sheathing.User R.This parameter allows the user to define the reduction factor for the bending capacity due to the rotational stiffness provided by the panel-to-purling connection, covering the AISI specifications for members having one flange through-fastened to deck or sheathing.Loc. Shear.The parameter defines if the shear is calculated in the member local axis.a (Stiffeners)It is the clear distance between stiffeners. It is used for the shear check (Section G2)Cm33Braced major (Frame type 3)This parameter defines if the member belongs to a frame with sidesway inhibited or sidesway uninhibited in direction of the member local axis 3.Braced minor (Frame type 2)This parameter defines if the member belongs to a frame with sidesway inhibited or sidesway uninhibited in direction of the member local axis 2.Bear. L.This parameter defines the bearing length that will be considered to check the crippling strength ( Section C3.4, Section 3.10). The minimum value should be 0.75 in or 19 mm for cold formed and 0.5 in or 12 mm for wood.Load. Cond.Fl. Sup. Cond.Braced Buck.The check box allows the calculation of the distortional buckling strength.kPhi.This parameter defines the rotational stiffness provided by restraining elements as defined in the AISI design code and used for distortional buckling calculations.Lm.This parameter defines the distance between discrete restraints that restrict distortional buckling as defined in the AISI design code.