Structural, economic and material comparison of various steel grades under fatigue loading

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dc.contributor.author Amobi, Ikechukwu Ugochukwu
dc.date.accessioned 2008-03-28T09:49:56Z
dc.date.available 2008-03-28T09:49:56Z
dc.date.issued 2008-03-28T09:49:56Z
dc.identifier.uri http://hdl.handle.net/10539/4714
dc.description.abstract ABSTRACT As industries are upgrading rapidly from a lower steel grade to higher ones it has become necessary to study the effect of changing from lower steel grades to higher grades. This thesis reports on fatigue life and behaviour, economic implications and material composition of these higher strength steels (HSS) as compared to the conventional grades. Three grades are commercially available in South Africa: 300W, 350W and 460W. These different steel grades (conventional and HSS) with the same moment capacities where subjected to constant dynamic stresses and the fatigue crack growth of the overloading and unloading were monitored and compared with each other. The influences of the overloading and unloading made standard grades perform better under repeated loading than the HSS, since HSS have been proved to have poor ductility, resulting in lower number of cycles to failure. An 85% increase in material cost was generated as HSS replaces the conventional lower steel grades. Reduction in number of cycles to failure in HSS was over 500%. A space analysis for a multi-storey building with 10 beam floors was conducted for the various steel grades using a software package. The buckling and linear behaviours of these structures were compared. Although the deflections were not too far apart, it was shown clearly that grade lower steel grades performed better than the higher grades. An optimization was conducted using the parameters discussed in the text or obtained from experiment and computer modelling, in order to aid in the selection criterion of general purpose steel. Grade 300W was the optimal grade although the result was based mainly on the cost and fatigue behaviour of the three grades. en
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dc.language.iso en en
dc.subject fatigue en
dc.subject steel grades en
dc.subject ductility en
dc.subject HSS en
dc.subject stresses en
dc.subject moment capacity en
dc.subject crack growth en
dc.subject cycles to failure en
dc.subject optimization en
dc.subject buckling en
dc.subject general purpose steel en
dc.title Structural, economic and material comparison of various steel grades under fatigue loading en
dc.type Thesis en


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