Study on Concrete–Filled Steel Member Subjected to Cyclic Loading

Local buckling may occur in the compression flange of rectangular hollow-section beam under cyclic repeated loading arising from earthquakes. Once a local mechanism forms, residual strength rapidly reduces within a few cycles. This paper aims to study the experimental behaviour and ultimate moment capacity of unfilled and concrete-filled rectangular hollow sections subjected to cyclic reversible loading. Two types of filler material were used - normal mix concrete and fly ash concrete. The effect of filler materials, section slenderness, load-deflection response, moment-strain behaviour, ductility, stiffness degradation and energy absorption of concrete –filled RHS beams are studied. From this study it is understood that void filling increase the capacity of the section.