Introduction - The Behaviour and Design of Steel Structures to EC3 - page 30

1.7.4 Stiffness design
In the stiffness design of steel structures, the designer seeks to make the structure
sufficiently stiff so that its deflections under the most adverse working load con-
ditions will not impair its strength or serviceability.These deflections are usually
calculatedbyafirst-orderlinearelasticanalysis,althoughtheeffectsofgeometri-
cal non-linearities should be included when these are significant, as in structures
whicharesusceptibletoinstabilityproblems.Thedesigncriteriausedinthestiff-
ness design relate principally to the serviceability of the structure, in that the
flexibilityofthestructureshouldnotleadtodamageofanynon-structuralcompo-
nents, while the deflections should not be unsightly, and the structure should not
vibrate excessively. It is usually left to the designer to choose limiting values for
use in these criteria which are appropriate to the structure, although a few values
are suggested in some design codes. The stiffness design criteria which relate to
thestrengthofthestructureitselfareautomaticallysatisfiedwhentheappropriate
strength design criteria are satisfied.
References
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