Abstract
This paper gives theoretical and experimental analysis for the lateral stability of trusses, which are considered as a whole, not as a part. In the first half of this report approximate solutions are derived by using the similar methods applied to the stability of compression chords of pony truss bridges. In the latter half of it experimental results of built-up columns, some of which are composed of steel tubes and others of angle-section beams, are presented. And they show good agreement with the caluculated ones. In short the result obteined is that trusses as well as open-web I-beams (see No. 66) can be regarded to be the same as rolled I-beams.
