Truss Design Module HelpSteel design criteria for BS5950 - 2000 Steel design criteria for BS5950 - 2000 Bending mLT33 mLT22 LE pos (effective length for lateral-torsional buckling) (effective length for lateral-torsional buckling) LE neg. (effective length for lateral-torsional buckling) (effective length for lateral-torsional buckling) Compression Lv Cnx type (connection type) (connection type) Combined m33 m22 Restr. Flange (flange laterally restrained) (laterally restrained flange) LE pos (effective length for lateral-torsional buckling)It is used in positive moment regions. This length is related to the length of the compression flange between restraints, see Section 4.3.5 of the Code. If LE=0 the program will adopt LE=L (flexural length between nodes). In I-sections members and one flange laterally restrained, the flag “Restrained flange” should be enabled to adopt Annex G in the out-of-plane stability calculations. In this case LE should consider the distance between intermediate restraints.LE neg. (effective length for lateral-torsional buckling)This parameter is for hogging moment regions. This length is related to the length of the compression flange between restraints; see Section 4.3.5 of the Code. If LE = 0 the program will adopt LE = L (flexural length between nodes). In members with I-sections and one flange laterally restrained, the flag “Restrained flange” should be enabled to adopt Annex G in the out-of-plane stability calculations. In this case LE should consider the distance between intermediate restraints.m33This factor relates the real moment diagram of a member with its equivalent uniform moment diagram. This coefficient is applied to the bending term in the interaction equations, and is dependent upon the member curvature caused by applied moments. If m33 = 0, the program will calculate the values of these parameters following the specification given in Table 26 for either a first order or second order analysis. However, the user may manually enter any value. m22This factor relates the real moment diagrams of a member with its equivalent uniform moment diagrams. This coefficient is applied to the bending term in the interaction equations, and is dependent upon the member curvature caused by applied moments. If m22 = 0, the program will calculate the values of these parameters following the specification given in Table 26 for either a first order or second order analysis. However, the user may manually enter any value. mLT33The equivalent uniform moment factors are used for lateral-torsional buckling calculations. If mLT33 = 0, the program will calculate a mLT33 in accordance with Table 18 of the Code. It is recommended to use the default value, mLT33 = 0, and allow the automatic calculate of this parameter.mLT22The equivalent uniform moment factors are used for lateral-torsional buckling calculations. If mLT22 = 0, the program will calculate a mLT22 in accordance with Table 18 of the Code. It is recommended to use the default value, mLT22 = 0 and allow the automatic calculate of this parameter.LvIt is the distance between the intersection of centroidal axis or the intersections of setting out lines of bolts considering normally the axis of the minimum radius of gyration in angle, channel or T-section struts. This parameter is used with the design process detailed in Section 4.7.10 considering the values of Table 25 in the calculation of the slenderness.Cnx type (connection type)It is a variable that describes the type of connection that it is being used with the struts. See Table 25.Restr. Flange (flange laterally restrained)When this flag is enabled (Yes), Appendix G is adopted for the design, considering that the member has one flange laterally restrained. This is only valid for I–section uniform, tapered or haunched members.