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The Structural Engineer, Volume 44, Issue 9, 1966
Mr. C. B. Stone (Vice-president) said it was a common failing of consultants not to admit that their Structures leaked; however, he himself did not know of any case of leakage due to shutter ties. Mr. Jackson had shown there was a weakness but Mr. Stone thought that, if there had been a low water/cement ratio and thorough compaction by vibration, the cavity would not have formed.
Mr. D. G. ,Alcock (Associate-Member) writes:- ‘The authors claim to present a unified approach for the determination of the degrees of freedom or indeterminacy of plane and space frames. In fact the claim is rather ambitious as it can only yield the degree of indeterminacy of a structure which is already known to be stable.'
The paper describes tests on twenty-seven Lytag concrete columns. Sixteen of the columns were reinforced with varying percentages of square twisted steel and the remaining eleven were unreinforced. It was found that, although the ultimate loads of reinforced Lytag concrete columns are slightly less than those of equivalent gravel concrete columns, the load factors are satisfactory. It is therefore safe to design reinforced Lytag concrete columns with the permissible stresses specified in CP l14 (1957). C.O. Orangun