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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 reviews classic examples of historic bridge refurbishment and then considers some of the difficulties that are arising in the refurbishment of the postwar concrete and steel bridge stock. From this the needs for research and development on the assessment of deterioration and on the strength and durability of remedial works are identified. Some suggestions for bridge designers are made.
Jonathan G.M. Wood