Author: Studzinski, S H
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Studzinski, S H
The Structural Engineer, Volume 41, Issue 8, 1963
Composite construction in structural steel and concrete slab in the early years was mostly designed for medium-span highway bridges in which steel beams were seldom fully encased and for which shear connectors were necessary to maintain the composite action against the vibration due to traffic. In consequence the majority of the experimental investigations were concerned with the behaviour of composite beams provided with shear connectors and the load-carrying capacity of various types of shear connector. Very little has been done on the determination of horizontal shear resistance of composite Tee-beams in which the fully encased steel joist has no shear connectors. F. K. C. Wong
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
During the last decade the electronic digital computer has come to be increasingly used for large-scale accountancy and for the solution of complex scientific calculations. Many problems in structural analysis and design can now be performed very easily on the electronic computers which have been installed up and down the country, particularly at the universities and at research institutions. The purpose of this paper is to explain briefly how these machines work and how they are actually operated to analyse various kinds of structure. E. LIGHTFOOT