vvThere has been much work published in recent years on the use of vibration characteristicsto detect damage in bridges. Almost all of this work has been based on theassumption that the vibration is linear, i.e. the natural frequencies are not dependent onthe amplitude of oscillation. The aim of the work presented here was to investigate thepossibility of using changes in the non-linear vibration characteristics to detect damagein reinforced concrete bridges.These changes in the non-linear ...