EVALUATION OF SINGLE BUCKLING AND COUPLED BUCKLING LOAD OF COLUMNS IN BRACED FRAME

In general, single buckling model is applied to deal with buckling analysis of slender columns in complex frame in order to provide a handy method to evaluate buckling load and effective length. However, buckling behaviors of columns are affected by each other. The effect of coupled instability may be considerable especially in non-uniform frame. This study aims to propose a parametric method to evaluate the buckling load considering the effect of coupled instability subjected to columns in braced frame. The correlation between single buckling and coupled buckling is revealed through theoretical analysis. The critical load of single buckling and coupled buckling are formulated based on the examination. In the process, the lower limit and upper limit of buckling load are found effective and important.