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A simple diagonal stiffener is proposed as a solution to premature local flange and web buckling of plastically designed members in pitched-roof portals and continuous beams. This solution is developed from theoretical predictions and experimental results, which also show that existing Codes do not allow for certain effects which significantly reduce the rotation capacity of members under moment gradient, particularly the influences of span and coincident axial force. A new model is proposed for the interaction between local flange, local web, and lateral-torsional buckling of plastically designed members, which compares favourably with earlier test results. The stiffener arrangement approximately doubled the rotation capacity in five pairs of stiffened and unstiffened test specimens in which the critical modes were local flange or web buckling. Professor A.R. Kemp
The Engineering Council recently published a discussion document ‘Continuing education and training’, the foreword of which states bluntly that data on continuing education and training in the United Kingdom are inadequate to form the basis for either a coherent policy or a plan for future action. Nevertheless, they state that the matter has become one of urgency by comparison with the efforts of some of our foreign industrial competitors who are very active in this field.
The paper makes some observations and suggestions about developing an approach to conservation that includes the consideration of a building’s anatomy and structure. It describes the reconstruction of the Great Hall roof of Bedford School as an example of this approach. D. Sugden and C. Wymer