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THIS PAPER PRESENTS AN EXACT MODEL FOR STUDYING THE GLOBAL BUCK-LING OF CONCRETE-FILLED STEEL TUBULAR (CFST) COLUMNS WITH COMPLI-ANT INTERFACES BETWEEN THE CONCRETE CORE AND STEEL TUBE. THIS MOD-EL IS THEN USED TO EVALUATE EXACT CRITICAL BUCKLING LOADS AND MODES OF CFST COLUMNS. THE RESULTS PROVE THAT INTERFACE COMPLIANCE CAN CONSIDERABLY REDUCE THE CRITICAL BUCKLING LOADS OF CFST COLUMNS. A GOOD AGREEMENT BETWEEN ANALYTICAL AND EXPERIMENTAL BUCKLING LOADS IS OBTAINED IF AT LEAST ONE AMONG LONGITUDINAL AND RADIAL INTERFACIAL STIFFNESSES IS HIGH. THE PARAMETRIC STUDY REVEALS THAT BUCKLING LOADS OF CFST COLUMNS ARE VERY MUCH AFFECTED BY THE INTERFACIAL STIFFNESS AND BOUNDARY CONDITIONS.

Buckling of Slender Concrete-Filled Steel Tubes with Compliant Interfaces