EXPERIMENTAL VALIDATION OF THE USE OF ENERGY TRANSFER RATIO (ETR) FOR DAMAGE DIAGNOSIS OF STEEL-CONCRETE COMPOSITE BEAMS

The paper presents changes of modal parameters such as natural frequencies, damping ratios and energy transfer ratios (ETR) following damage of the connection of a steel-concrete composite beam. Sensitivity analysis of the parameters is conducted both for numerical simulation and experimental results. The energy transfer ratio ETR is determined: i) for the whole beam - as a global parameter which can be used for damage detection, ii) for segments of the beam - as a local parameter which can be used for damage localisation.