The second book of the set of works by the CIDECT under the general title “Construction with Hollow Steel Sections” is dedicated to phenomena of instability: buckling, distortion, spreading. Because of the shape of its section and the particularly favourable distribution of matter in the straight section, a hollow profile, of circular or rectangular shape, behaves distinctly better than an open profile section under the demands of compression. In remaining within the limits of the relation of the diameter or the width of side divided by the thickness of partition, given in this dimensioning guide, the local hollow profile distortion can be disregarded. On the other hand, the resistance to spreading is, in practice, not verified because hollow profiles possess a distinctly larger polar rigidity than open section profiles.
While using this book, architects, engineers and constructors will be able to extract to the maximum the advantage of the remarkable properties of hollow profile stability. The computer examples illustrated in the guide and permit a better understanding of the topic.