EWPAA Structural Plywood and LVL Design Manual - Engineered ...

FIGURE A6.3: Continuous restraint along the tension edge combined with discrete torsional restraintsBeams that bend only about their minor axisFor all cases, the slenderness co-efficient, denoted by S 2 , may be taken to be –S 2 = 0.0Beams that bend about both axisThe design of such beams, described in Section 6.8, is based on an interaction of the two special cases forbending about single axis only, and hence no special definition of slenderness is required for this case.Slenderness co-efficient for lateral buckling under compressionGeneralFor the general case, and for several useful specific cases, equations for evaluating the slenderness coefficientare given in Paragraph E4, Appendix E. For the case of solid columns of rectangular cross-sectionas shown in FIGURE A6.4. The simple approximations given in Clause 3.3.2.2 may be used.Columns of rectangular cross-sectionFor columns of rectangular cross-section, the slenderness co-efficients may be taken as follows:(a)Slenderness co-efficient for buckling about the major axis.For the case of discrete restraint systems, the slenderness co-efficient, denoted by S 3 , shall betaken to be the lesser of the following:L axS3 =dandwhereSL ax3 =g13Ld= the distance between points of effectively rigid restraint betweenwhich bending about the major (x) axis would be produced bybuckling under load. See FIGURE A6.4.g 13= the co-efficient given in Table 3.2, AS1720.1-1997For restrain systems that restrain movement in the direction of the y-axis, and are continuous alongthe length of the column, the slenderness co-efficient may be taken to be:51