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This paper is concerned with a simplified analysis of the bursting forces occurring in the transition zones close to a single prestressing anchorage in the centre of a square concrete prism. M. Gaynor
An elastic-plastic analysis of plane frameworks loaded up to collapse by proportionally increasing loads has been described by Jennings and Majid. Their analysis, which was programmed for the digital computer, was limited by the fact that no treatment was suggested for considering the irrcvcrsible nature of plastic deformations and thc analysis had to be terminated should a plastic hinge be found to ‘ unload ’. This paper describes how the work of Jennings and Majid has been extended to include this effect and also to consider the response of plane frameworks to cyclic or programme loading. A general computer programme has been written in order to carry out the analyscs. This programme also takes into account the effect of train hardening in the plastic hinges. Some results obtained by using the programme are included in the discussion. J.M. Davies
Fluctuating-tension tests have been undertaken to assess the fatigue strength of a new form of splice for joining 0.2-in-diameter high tensile steel wire. The mean stress level for most of the tests was that appropriate to the suspension bridge main cable higher mean stresses more relevant to prestressed concrete condiapplication, 40 tons/in2. In a more limited number of tests, however, higher mean stresses more relevant to prestressed concrete conditions were used. The results obtained indicate a probable safe stress fluctuation for a limited life. M.S.G. Cullimore