Abstract
Background:In the current paper the origin of steelIbeams has been analysed from historical-technological and structural points of view.Method:First, the way leading to discover the most famous structural member of the modern Steel Engineering has been reconstructed. Later on, parameters of structural efficiency, allowing for a quick numerical evaluation of the effects produced by the rolling process on the semi-finished casting products, have been defined as a function of the difference in terms of weight between the solid billet and the member final shape on the basis of the more or less raw material centrifugation. By using the above mentioned structural efficiency parameters, the design criteria used for development of the European list of sections, with particular reference to IPE and HE profiles, have been comprehended.Result and Conclusion:Finally, the proposed method, if applied to members having the same area, allows defining, without considering local buckling phenomena, the best profile for each performance category of steel members.
Highlights
Used as member with either wide or narrow flanges subjected to bending moment and/or axial forces, the undisputed star of the steelwork is certainly the I profile, defined according to the code EN 10079:2007 [1] as I or H beam
After an accurate analysis of the genesis of the hot-rolled steel I profiles, some parameters related to the profile structural efficiency, giving information about the effects that the material centrifugation generated by the lamination process induces on the structural performance of such profiles, have been provided
It has been investigated the efficiency trend of the main geometric properties related to the structural performances at the Ultimate Limit State and at the Serviceability Limit State
Summary
In the current paper the origin of steel I beams has been analysed from historical-technological and structural points of view. Method: First, the way leading to discover the most famous structural member of the modern Steel Engineering has been reconstructed. Parameters of structural efficiency, allowing for a quick numerical evaluation of the effects produced by the rolling process on the semi-finished casting products, have been defined as a function of the difference in terms of weight between the solid billet and the member final shape on the basis of the more or less raw material centrifugation. By using the above mentioned structural efficiency parameters, the design criteria used for development of the European list of sections, with particular reference to IPE and HE profiles, have been comprehended. Result and Conclusion: the proposed method, if applied to members having the same area, allows defining, without considering local buckling phenomena, the best profile for each performance category of steel members
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