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The behaviour at collapse of mild steel beams of rectangular section is examined for the case of transverse loading applied in the planes of both major and minor axes. The usual criteria for the plastic failure of a two-dimensional flexural structure are applied to these problems. The yield criterion will be found to involve the development of the full plastic moment about axes other than the principal axes and the mechanism condition requires the formation of two, three or four bar linkages, the kinematics of which have to be taken into account. Solutions determining the collapse loads are obtained and tests are described which enable a comparison of predicted and observed collapse loads to be made.
Mr. Bowen, in opening the proceedings, recalled that National Productivity Year began in November. Of its aims, the one which many people regarded as of paramount importance was to explore possible means of, and draw attention to the need for, raising efficiency in all industries. Whether or not Britain joined the European Common Market, she must expect to face fierce international competition in all spheres of activity.
In Part 1 of this series1 a computer programme which determines the equilibrium geometry of a free suspension cable under a pattern of vertical loading was described.
D. M. BROTTON and G. ARNOLD