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The Structural Engineer, Volume 58, Issue 8, 1980
A method has recently been proposed for the design of unbraced, multistorey steel frames to limiting values of horizontal deflection. It is shown that this permits an approximate value for the lowest elastic critical load to be quickly calculated. Study of a typical frame demonstrates that in many cases the result can be expected to be sufficiently accurate for use in design. D. Anderson
Mr B. B. Russoff (F) (Phillips Consultants): Clause 9.6.2 of CP 110 states, ‘when testing prestressed concrete, allowance should be made for the effect of prestress at the time of testing being above the final value’. I should like to hear how the authors interpret this practically, when making load tests.
Methods are now available for the design of composite columns with concrete casings of normal density aggregates for the design of both bridges and buildings. Here the counterparts of these methods are given for casings of lightweight aggregate concretes. The full report describing their derivation is held in the Institution’s library under reference X70. D.G.E. Smith