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A method is given for the minimum cost design of rigidly jointed, multistorey steel sway frames in which economic and some architectural requirements determine their final shape. Appropriate ‘differential’ deflection constraints are imposed to control the sway in each storey. The object is to minimise the total cost of the constnrction, including material and any other handling costs. The latter is expressed as a Tied charge ’ to penalise a member retained in the final topology. The problem turns out to be that of non-linear, mixed variable integer programming. Suggestions are made to simplifr the mathematical approach, and examples are given to demonstrate the flexibility of the method.
K.I. Majid, P. Stojanovski and M. P. Saka
A brief survey of design practice reveals different design methods in Britain and America and some difference of opinion among engineers in Britain. The results of 18 tests are reported which show that American practice gives reasonable safety and economy. They indicate, however, that British practice gives conservative results if CP I10 bond stresses are used but, where base thicknesses are determined from consideration of shear stresses, results with varying margins of safety are obtained. It is suggested that CP 110 should be modified so that safe, but reasonably economical, base thicknesses are obtained.
A.W. Astill and D. K. Absajir