基于位移差曲率的下承式拱桥吊杆损伤识别

Damage Identification for Suspender of Through Arch Bridge Based on Curvature of Displacement Differences

依据摄动有限元理论研究了拱桥吊杆损伤对拱桥位移的影响,提出了基于吊杆损伤前后拱桥位移差曲率的吊杆损伤识别方法,即先测出吊杆损伤前后的拱桥位移,求出位移差曲率,再依据位移差曲率曲线进行损伤识别。通过某下承式拱桥的有限元模型分析,表明该方法不仅能准确识别出损伤吊杆的位置,而且还能大致判断出吊杆的损伤程度,验证了该方法的正确性。该方法不仅适用于单根吊杆损伤的识别,而且还适用于多根吊杆损伤的识别,测试简单、精度较高,适合于工程应用。

Based on the perturbation finite element theory, the effect of arch bridge on the displacement of arch bridge was studied, and the method of boom damage identification based on displacement difference of arch bridge before and after the damage of boom was put forward. The displacement of the arch bridge was measured before and after the damage of the boom, and the displacement difference curvature was obtained, and then the damage was identified according to the displacement curve. Through the finite element model analysis of a certain through arch bridge, it was shown that this method not only could accurately identify the position of the damaged boom, but also could judge the damage degree of the suspender. The correctness of the method was verified. The method is simple, accurate and suitable for engineering application.