基于柔度曲率差的桥梁健康诊断方法

Damage evaluation of bridge structures based on flexibility curvature difference

本文在柔度矩阵基础上,用柔度曲率差为识别指标研究了桥梁结构多位置的健康诊断,并以几种梁式桥为例进行有限元仿真验证。结果表明,柔度曲率差具有良好的坐标指示能力,在损伤位置处,指纹有明显突变,损伤增大突变也相应增加,利用该方法进行梁式桥损伤识别可获得很好的识别精度,采用三次样条函数拟合柔度值的方法可有效解决解决噪声的干扰问题。

Based on the curvature difference of flexibility, multiple - position damage evaluation of bridge structures is presented. The effectiveness of the approach is verified by the numerical examples of bridge structures. This approach has the advantage that completeness of the modal parameters is not required, and only observation data of the lowest mode shape can give sufficiently accurate results. The higher the degree of damage, the larger curvature change takes place. The Three - spline function fitting technique is used to improve the accuracy of damage evaluation when noise increases to some extent.