This article summarizes the key aspects of the 20th Symposium of the International Society for Engineering Education (IGIP), held in Dresden from 11 to 14 September 1991. The conference papers have been published in two volumes and all the references quoted in this overview appear in this publication.
The design of composite beams to SABS 0162 is compared with other international codes. The basis of the different methods is presented and reasons for differences in approach are identified. It is shown that similar ultimate moment resistances and load capacities are achieved for full and partial shear connection, but considerable differences exist in the serviceability requirements. The specified resistance of stud shear connectors also differs and recent tests have cast doubts on the adequacy of the reduction factors that are appropriate for certain shapes of steel decks. An alternative formulation is proposed for this influence that compares favourably with the test results.
Great emphasis has been placed on the provision of adequate mass housing. The large number of these houses that would be constructed on active clay places a responsibility on the engineer to come up with an optimum foundation design. In this paper a clay model, with which it is possible to explain the free swell of an active clay, was presented. The clay model was used to postulate the existence of a swell threshold suction in active clay and then to prove it using laboratory results. This threshold suction holds implications for the more advanced heave prediction methods. Lastly, a few simple but rational free swell prediction equations were also presented.