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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
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
The paper deals briefly with the application of reinforced concrete cellular deck for bridges (hereinafter referred to as box girder) in the USA and its wide use in the State of California for structures in urban expressway systems. The history of the box girder structure, its advantages, economy and applications are mentioned. Design specifications both theoretical and practical are discussed and illustrated. Finally a typical example of a box girder detail is shown together with sketches and photographs of box girder application in viaducts and flyovers.
S. H. Studzinski