Energy Absorption Capacity of Composite Beams

Local buckling may occur in the compression flange of rectangular hollow-section beams under cyclic repeated loading arising from earthquakes.Once a local mechanism forms, residual strength rapidly reduces within a few cycles.This is true even for compact sections under static bending.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, loaddeflection response, moment-strain behaviour, first cycle peak load, ductility, stiffness degradation and energy absorption of concrete -filled RHS beams are studied.