G.L. Hutchinson, Reader in Civil Engineering, University of Melbourne and John L. Wilson, formerly State Electricity Commission of Victoria, Melbourne, now of Ove Arup & Partners, London, examine the design of typical medium-rise steel-framed industrial buildings. Such buildings usually possess a non-uniform distribution of mass and stiffness and consequently respond in more than one mode under earthquake excitation, thus making the application of Article 16 of the Chinese Earthquake Code appropriate