Download PDF by P.R. Knowles: Design of structural steelwork

By P.R. Knowles

ISBN-10: 0903384590

ISBN-13: 9780903384599


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A circular argument of this kind can be resolved by making a guess at the dead load (based on, for example, a similar scheme), and then checking the dead load of the resulting structure. If the initial guess is not grossly different then a second calculation should be sufficient. The problem should not, in any case, be over emphasized; for modest size structures the dead load is only a small portion of the total loading (1). The imposed (live) loading arises from a number of sources, not only external to the structure (stored material, snow, people, wind) but also from internal effects such as temperature differential.

1 Instability of a compression number The satisfactory performance of a structure depends not only on its ability to withstand the loads imposed on it (resistance to rupture) but also on its remaining stable under these loads. Instability can take a number of forms: (a) total instability of the structural system (b) instability of a component in the system (c) instability of an element forming part of a component. Element and component stability problems may arise at points where there is partial or complete compressive load on the cross-section, conditions which must occur somewhere in all practical structures.

Welded plate girder profiles are under the designer’s control; he can, within reason, adjust the depth and flange to web thickness ratio to give as economical a solution as possible. 3 Stability The relatively slender profile of steel beams gives rise to a marked tendency to local or overall instability under certain conditions. 5). The slenderness of a beam, λ, is expressed as the ratio in which LE, the effective length, is based on the distance between lateral supports modified for the type of restraint given by these supports.

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Design of structural steelwork by P.R. Knowles

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