Critical Buckling load and Effective Length of Concrete Filled Steel Tube Column (CFST)
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Date
2019-10
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Addis Ababa University
Abstract
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.
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Keywords
Concrete filled steel tube (CFST), effective length factor, finite element method (FEM), linear buckling analysis, non-linear buckling analysis, Euro code 4