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Abstract
This Thesis presents a study of the structural design of beam-columns in accordance with the latest Egyptian steel codes (ASD & LRFD) under the effect of different live to dead load ratios. Extracted design charts are produced to determine the relation between different Live to dead load ratios versus different unsupported member lengths. While focusing on regions where either LRFD or ASD shall give an optimum designed section based on the different design parameters. Different cross sections, member spans, steel grade and buckling lengths are introduced. It is shown clearly the significant effect of different sharing of axial compression force to the applied moment for the output results. Great influence is also observed for the unsupported length 2Lu3 and of course the live to dead load ratio. Generally it is concluded that, ASD” method is more reliable than ”LRFD” method for beam-column section with bigger unbraced length ”Lu2, and for higher N ratios, while LRFD method is much optimum for smaller Lu values, smaller N ratios, smaller cross sections and smaller L/D ratios