Abstract
If columns and beams of deep but narrow cross section such as I-Beams are loaded in the plane of the web, they may buckle sideway. But, when they are braced laterally at some points, the critical loads of them may be affected by lateral supports. This chapter gives an approximate analysis, using the energy method, for the lateral buckling of elastic columns and beams with lateral bracing. And then the author has presented numerical solutions of some examples and discussed about characteristics of effective bracing.