Browsing by Author "Zewudu, Minwuyelet"

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    Critical Buckling load and Effective Length of Concrete Filled Steel Tube Column (CFST)
    (Addis Ababa University, 2019-10) Zewudu, Minwuyelet; Bedilu, Habte (PhD)
    The effective length and critical buckling load of concrete filled steel tube (CFST) columns are the two key parameters to determine its ultimate strength for engineering design. Design codes such as Euro codes and others have limitations regarding to critical buckling load and effective length values for the CFST columns. Hence, in this thesis, to determine the critical buckling load and effective length factor based on linear and non -linear buckling analysis, isolated CFST columns with different end conditions were investigated. By comparing the results of linear and non-linear finite element analysis result with the current design practice, possible recommendations have been given to referring to effective length factor, and consequent critical buckling load for concrete filled steel tube (CFST) column. The results indicate that the current theoretical and recommended effective length factors given on the EC4 is a conservative estimate which gives uneconomical design so that the currently adopted code underestimates the critical Buckling load of the CFST column.