As C and Z sections become more complex with features such as additional multiple longitudinal web stiffeners and return lips as designed on SupaCee and SupaZed sections, the computation of the effective widths becomes more complex. The Direct Strength Method appears to be more beneficial and simpler that the Effective Width Method by using the elastic buckling stresses of the whole sections. By Pham, C.H. and Hancock, G.J., University of Sydney School of Civil Engineering Research Report R925. http://sydney.edu.au/engineering/civil/publications/2012rreps.shtml
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