基于曲率模态的钢管混凝土拱桥吊杆损伤识别

为研究曲率模态参数在吊杆损伤状态下的响应情况，以某钢管混凝土拱桥为研究对象，进行基于曲率模态的吊杆损伤识别模拟.利用ANSYS软件建立桥梁有限元模型并得到其动力特性，模拟各种不同工况，比较结构曲率模态参数的变化情况.结果表明：采用曲率模态指标可以识别吊杆损伤位置，综合考虑多阶振动情况下的平均曲率模态指标可以提高识别的准确性，并初步估计损伤程度；多吊杆损伤情况可以看成单一吊杆损伤情况的累加.
In order to study the response of curvature mode parameter during the suspender damage, taking a concrete-filled steel tube arch bridge as study object, the damage identification of suspender was studied based on curvature mode. The finite element model was established by using ANSYS software and the dynamic characteristics were calculated. The conditions of suspender damage were simulated, and the curvature modes of structure were compared under different conditions. Result shows that the damage location of suspender can be identified by the index of curvature mode. The average index of curvature mode under multi-frequency vibration should be considered so as to improve the accuracy of damage identification, and the damage degree is preliminarily determined. The multiple suspenders damage can be considered as the accumulation of single suspender damage.