Author: Ford, R F;Lilley, C
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Ford, R F;Lilley, C
One of the major challenges facing the new South Africa is that of providing shelter for its burgeoning urban population. Current estimates of housing needs vary considerably because of the differences in assumptions on which they are based. One of the most authoritative commissions in recent years, the de Loor Commission, concluded that the existing housing backlog is 1 299 000 units and the number of shelters to be put up for new family formations amounts to 198 000 units p.a. Thus in order to provide for new family formation and to eradicate the existing backlog over 10 years, approximately 300 000 units have to be provided p.a. R.B. Watermeyer
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.
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