基于曲率模态方法的钢桁架桥梁损伤识别

由于曲率模态（CurvatureModeShabe）是一个能反映局部特征变化的模态参数,它可以通过各阶振型来得到,所以在桥梁结构状态监测中有着良好的应用前景。论文对曲率模态方法理论进行研究,建立钢桁架铁路桥梁的有限元模型,进行曲率模态的研究。通过研究得到：随着损伤的加剧,各阶固有频率均呈下降的趋势,但变化不明显;从振型的变化也难以看出损伤的位置;随着损伤的加剧,曲率模态变化较明显,因此通过曲率模态的变化容易识别损伤的位置及损伤程度。

Method of Steel Truss Bridge Damage Identification Based on Curvature Mode Shade

Because of the Curvature Mode Shape is a model parameter which can reflect the local characteristic changes,it can be got through each other modes,so it has a good application prospect in bridge structure condition monitoring.In this paper,the method and theory of the curvature mode is studied,the finite element model of the steel truss railway bridge is established.Through the research,we get：along with the damage intensifies,the order natural frequency are in a downward trend,but does not change significantly;from the change of vibration model,it can also be difficult to see the damage location;and along with the damage intensifies,the curvature mode change is more apparent.Therefore,through the change of curvature mode,the damage location and damage degree are easy to identify.