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The analysis and tests of cold-formed thin-walled channel frames including nonlinear flexible or semi-rigid connection behaviour is presented. The semi-rigid connection behaviour is modelled using a mathematical approximation of the connection flexibility or moment-rotation relationship. Local instability in the form of local buckling of members is included in the analysis. The full response of the...
This paper reviews the existing methods of collapse analysis for thin-walled rectangular section tubes subjected to bending about a principal axis and suggests a new collapse mechanism that gives an improved analytical solution for the moment-rotation relationship. The new model is kinematically admissible and completely analytical. It involves two unknown constants, half the length of the folding...
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