基于灰色系统理论的系杆拱桥吊杆损伤识别研究

Research on Damage Identification of Suspension Rod of Tie Arch Bridge Based on Gray System Theory

传统损伤识别研究中往往不能对系杆拱桥吊杆损伤进行较为准确的诊断,凭借系杆拱桥有限元实例模型,提出基于挠度影响线曲率差值结合灰色系统理论对桥梁吊杆损伤进行诊断的方法。研究发现:系杆拱桥损伤前后挠度影响线曲率差值可以对损伤位置进行准确定位,曲率差值突变位置就是桥梁损伤位置;灰色相关系数和桥梁损伤程度成反比且具有一定鲁棒性,灰色相关系数越大,则损伤程度越小。

The traditional damage identification research often can not be more accurate diagnosis of the tie arch bridge boom damage,by virtue of the tie arch bridge finite element example model,proposed based on the deflection line curvature difference combined with the gray system theory of the bridge boom damage diagnosis method.It is found that the curvature difference of the deflection influence line before and after the damage of the teth⁃ered arch bridge can accurately locate the damage location,and the location of the curvature difference muta⁃tion is the damage location of the bridge.The gray correlation coefficient is inversely proportional to the degree of bridge damage,and the larger the gray correlation coefficient is,the smaller the degree of damage is.