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The Ordinary Meeting of the Institution at 6 pm on Thursday 12 February 1970 is to be a Joint Meeting with the British Section of the Societe des lngenieurs Civils de France. A number of French guest speakers have been invited, including M. Yves Saillard, the Technical Director of the Syndicat National du Beton Arme et des Techniques Industrialisees.
Mr. John M. Rolfe: ‘It is pleasing to see the use of Johansen’s yield line theory being given some publicity, since it’s power and versatility are not as widely appreciated as they deserve. However, there a few points on which I would like to comment.'
The paper describes the application of the finite element method of analysis for the determination of deflection and moment values in rectangular slabs supported at the four corners. Two types of corner boundary conditions were investigated: simple supports and fixed supports. Various loading conditions were studied for three aspect ratios within the range 1 to 2. A method allowing for column slab interaction is described in the Appendix.