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The paper deals with a direct method of solution for conoidal shells and discusses the present concept of choosing the number of boundary conditions for solution of the general equation of such shells.
Santi P. Banerjee
Mr. Husband presented the paper. He showed pictures of cantilever stadia abroad and many more of the Sheffield Wednesday stand in varioustages of its erection and after completion.
In 1952 a series of tests were carried out on a reinforced concrete building and unexpected results were obtained from two tests to destruction on interior slab panels.
In both tests the collapse load was more than twice the load predicted by the yield-line method. In a later paper Professor Ockleston, who carried out the tests, showed that this unexpected result can be explained by an arching action due to the development of compressive membrane stresses in the concrete. It was, however, not possible at that time to predict the extent to which arching action will affect the strength of a slab. This paper presents an analysis of arching action in beams and one-way slabs with lateral restraints and a method of estimating the ultimate strength of interior slab panels due to the combined effect of bending and membrane stresses. The ultimate strength is presented in graphical form as a function of the steel ratio and the ratio of span to effective depth. The results of a short series of tests show good agreement with values calculated according to the theory.
K. P. CHRISTIANSEN