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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).
A method is presented for the analysis of rigid space frames using iterative techniques. In no case are matrices larger than 3 x 3 used, so that the procedure may be carried out by manual methods or may, if desired, be programmed for computation using an electronic computer. The method is illustrated by two examples, one without sway and one involving sway of the frame.