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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
Mr. A. Pillai (Associate-Member) said that he was involved on a small job where a culvert had been floated out and they had had trouble synchronizing the winches, the hawsers breaking when they got into position. How had the author managed to synchronize all the winches?