A contribution to the design of composite beams to satisfy deflexion criteria R. TAYLOR 81 J. FRODIN M r J. Morrison, Buro Happold In the discussion of reference 4, Taylor@ questioned whether or not span/depth ratios were necessary and sufficiently accurate; he preferred to see deflexions calculated from first principles. It is, therefore, disappointing to find that the Authors are now advocating the use of charts as being preferable to simple direct calculations. 61. The main difficulty with the use of design charts is the loss of accuracy. Even after the span/depth ratio R, has been evaluated, there is a wide range of sections which can be adopted. For example, the initial value of R, selected by the Authors gave a minimum overall depth of 474 mm or 474-125= 349 mm as the minimum depth of the steel section. There are five universal beam sections with depths of 353-364mm. Further standard charts cannot deal with the unique or special composite beams, for example, beams with asymmetrical flanges.
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