ABSTRACT
In this chapter, the moment-curvature behavior of a short, fabricated cylindrical column is first studied considering the effects of residual stresses and out-of-roundness caused by forming and welding. This is followed by the study of elastic–plastic behavior of long columns, considering the effect of out-of-straightness. A realistic design for axially loaded fabricated cylindrical columns must consider the fact that an actual cylindrical column is geometrically and materially imperfect and is frequently subjected to bending moments resulting from unavoidable end eccentricities and lateral forces. Thus, all fabricated cylindrical columns must be designed as beam-columns. The basic relation required in any long beam-column analysis is the relation between moment and curvature for a given thrust. The tangent stiffness method is effective in numerically obtaining the non-linear moment-curvature-thrust relationship when the cross section is partially yielded.
