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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
It is often found in the design of bridges, and sometimes in the design of floor slabs and beams for buildings, that the spans are of uniform section and symmetrically placed. C. Lawrence
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. B. Rawlings