基于静力测量数据的桥梁结构损伤定位研究

基于灰色理论的相关性分析方法将静态位移曲率置信因子SDCACi应用到大型桥梁结构的静力损伤识别中,通过该因子沿桥的横向节点、纵向节点的变化曲线实现了对桥梁结构损伤的准确定位.由识别结果可以证明:不论测量数据(用有限元仿真计算并加上了一个正态分布的随机扰动考虑测量误差)的多少,该方法对结构中的单损伤和多损伤都能进行准确的定位,因此该方法在大型结构及复杂结构的损伤识别中具有广阔的应用前景.

Damage Detection of Bridge Based on Static Measurement Data Ⅰ: Damage Location

A new structural damage identification method using limited test static displacement based on the grey relation theory is applied to the damage detection of the large scale bridge.The displacement curvature and static displacement curvature assurance coefficient is defined and used to locate damage in the structure.A numerical example of a two-fixed bridge with single or multiple damages is used to examine the capability of the proposed method to localize and identify damages.The factors of measurement noise and incomplete test data are also discussed.The numerical results showed that the damage in the structure can be localized correctly through static displacement curvature assurance coefficient,regardless of the number of measured displacement nodes.This proposed method only requires limited static test data,which is easily available in practice,and has wide applications in structural damage detection.