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The Chairman: ' We are indebted to Mr. Williams and Mr. Rutter for their practical and informative paper. The authors have taken account of forces which only ten or 20 years ago would have been discussed only in a university laboratory. They have had concern with deflection which until quite recently was quite unthinkable. I think this is a sign of things to come, both in concrete and in steel. We are going to have to know things very much more, we are going to have to know very much more about the behaviour under working conditions as soon as we go over to what is known as the limit state method of design. '
The paper describes a general analysis of stress in short, reinforced concrete members having any shape in cross section and subject to any combination of bending moments and axial load. Soil pressures under spread footings may also be determined. All materials are assumed to behave elastically when in compression but only the steel reinforcement can carry tension. Stability, torsion and shear are not considered. The analysis is iterative and can be carried to any required accuracy. The means of programming the analysis for a computer are described and the use of an existing program is illustrated.
The self-weight of a cantilever tower that is deflected from its stable vertical position, will, in contributing to the loading on the structure, magnify the deflections and bending moments throughout the structure.
F.A. Gaydon and W.J. Lanarch