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Dr. Gunaratnam has undertaken a useful service for designers in comparing curvature and deflection calculated according to CP 110 Appendix A with the values obtained by simpler methods. However, his statement that the latter ‘lead to an underestimation of the curvature in all cases’ is startling for, if I have understood him correctly, he is saying that, by taking account of the stiffening effect of the concrete in tension, the calculated curvature is actually increased !
1. The Panel is extremely conscious of the ongoing nature of the work necessary to put
limit-state design using partial safety factors on a consistent and logical basis and of the amount of research that will be required to provide a sound basis for this. This second report is directed at offering some general recommendations to Code drafting committees when dealing with partial safety factors, suggest in guidelines for the experimental calibration of these on the lines of the suggestions made in paragraphs 4, 5, 6 and 7 of the first report*, and indicating subjects where further study and research is desirable.
John Derrington, BSc(Eng), DIC, FEng. FIStructE, FICE, FCIArb, succeeds Professor A. J. Harris as President of the Institution on 4 October next, and will give his Presidential Address 'The contractor's place' at an Ordinary Meeting 6.0 pm that evening at 11 Upper Belgrave St., London SWlX 8BH.