Author: Ford, R F;Lilley, C
First published: N/A
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Ford, R F;Lilley, C
Ron Watermeyer, the incoming chairman of the Joint Structural Division of the Institution of Structural Engineers and the South African Institution of Civil Engineers, graduated in civil engineering from the University of the Wit-watersrand in 1978.
In the previous issue sponsored by the South African Division, in 1990, Trevor Geach (an ex Vice-president) commented on the changes which had occurred in South Africa since the creation of the Division by a group of enthusiastic members in 1937. At that time, and up to the end of World War 2, it was accepted that the sign of a competent structural engineer was membership of the Institution of Structural Engineers. A.E. Goldstein
The extent of ground movements and stress concentrations in the vicinity of the reef in the deep mineshafts used in the South African gold mining industry have led to the requirement that special tower structures be developed to span the reef intersection zone in several new shafts. In order that structural engineers are able to design these towers, the dynamic behaviour of conveyances traversing them has been modelled to provide a means of determining the magnitude of the forces generated. This paper describes the design procedures arising from this analysis. An equation is derived which gives the minimum tower length and the minimum second moment of area that are required to ensure satisfactory operation of the shaft. Finally, an example of a typical tower design is given. G.J. Krige