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A unique facility for structural and wind engineering research on steel portal framed building behaviour is described. The Silsoe Structures Building is an intensively instrumented full-scale building structure, the frames of which can be connected to their pad foundations by any one of three interchangeable bolted joint arrangements which are representative of those joints used in practice and also of the pinned condition normaily assumed in design.
The elastic behaviour of simply supported beams subject to mixed gravity loading is considered. This loading comprises a full uniformly distributed load acting in conjunction with various patterns of equally spaced concentrated loads. The results of the investigation are presented in the form of a design chart and general equation. These demonstrate the interaction between the distributed and concentrated loads, and may be used in practice to determine the critical values of the individual loads at which buckling will occur.
Professor B.K. Dougherty
Mr J. K. Botterill of Chessington has some queries about the lapping requirements for fabric in the concrete Codes, which he sees as giving quite inadequate guidance. Would any of our readers feel emboldened to offer their own opinions as to what should be done, and whether what Mr Botterill suggests can be justified?