By P.R. Knowles
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Extra resources for Design of structural steelwork
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.
Design of structural steelwork by P.R. Knowles