ABSTRACT
This chapter discusses the behaviour and design of isolated beam-columns. Beam-columns are structural members which combine the beam function of transmitting transverse forces or moments with the compression member function of transmitting axial forces. Theoretically, all structural members may be regarded as beam-columns, since the common classifications of tension members, compression members, and beams are merely limiting examples of beam-columns. Beam-columns of more general cross-section may be analysed to determine the axial load and moment at full plasticity. The ultimate strengths of beam-columns with unequal end moments may be approximated by suitable interpolations between the linear and parabolic approximations for beam-columns in uniform bending and double curvature bending. The chapter analyses the elastic flexural–torsional buckling of symmetrically restrained beam-columns with equal and opposite end moments. The elastic biaxial bending of isolated beam-columns with equal and opposite end moments acting about each principal axis has been analysed.
