Durability in Design. Discussion on the paper by T. O’Brien MA BSc

Mr. K. F. Simm (of Freeman Fox & Partners) writes: ' The computer program described by the author greatly simplifies the analysis of reinforced concrete columns subject to bi-axial bending. It has been used in my office for some time and the data preparation is very much easier than the laborious hand calculation involved in Saville's method. '

As most of the piers of viaducts act as cantilevers for horizontal loads at top, requiring greater rigidity at base along longitudinal direction, a new type of structural element is suggested which is expected to serve as pier with reasonable efficiency. Rigidity at bottom is not much needed if piers act as a whole, being framed by top capping beam. S.K. Kundoo and B.B. Maiti

A method is presented in which the differences in stay tensions necessary to maintain equilibrium in a mast subjected to wind loading are related to the actual tensions developed in the stays as a result of changes in length of the stay chords caused by a displacement of the mast from an initial position. E.H. Rowland