摘要
损伤识别是目前桥梁健康监测领域中研究的热点问题。为进一步提升桥梁监测中的损伤识别精度,根据目前研究现状,以振动分析中的曲率模态参数为基础,利用模态二阶求导后的损伤因子DF指标进行桥梁的损伤识别研究。通过对一座连续梁桥预设不同位置、不同程度的单损伤、多损伤工况,并采用曲率模态损伤因子DF指标进行识别,结果表明该指标方法在大体上能较为准确地识别出单损伤、多损伤工况,但同时该指标曲线在二阶、四阶模态下的未损伤部位会出现突变,这在一定程度上会影响损伤位置判别。依据这一识别缺陷,提出了一种平均各阶次损伤因子曲线的识别方法,算例验证结果表明,该方法能有效降低未损伤部位的突变,具有较好的识别效果。
Damage identification is a hot research topic in bridge health monitoring.In order to further improve the damage identification accuracy in bridge monitoring,based on the current research status and the curvature modal parameters in vibration analysis,the damage factor DF index after the second-order modal derivation was used to carry out the bridge damage identification research.By presetting single damage and multiple damage conditions at different positions and different degrees for a continuous girder bridge,the damage factor DF index of curvature mode was used to identify the damage.The results show that the index method could identify single damage condition and multiple damage condition accurately in general,but at the same time,the undamaged part of the index curve might have mutations in the second and fourth order modes,which would affect the identification of damaged location to a certain extent.According to this identification defect,an identification method for the average damage factor curve of each order was proposed in the present paper.The verification results show that the method proposed in this paper could effectively reduce the mutation of the undamaged part and had a satisfactory identification effect.
作者
俞鹏骏
周方赛
吴多
王晨昊
胡志豪
万卫红
Yu Pengjun;Zhou Fangsai;Wu Duo;Wang Chenhao;Hu Zhihao;Wan Weihong(School of Civil and Architectural Engineering,Nanchang Institute of Technology,Nanchang Jiangxi 330099,China)
出处
《山西建筑》
2023年第12期176-179,共4页
Shanxi Architecture
基金
2022年江西省大学生创新创业训练计划资助项目(S202211319011)
2021年国家大学生创新创业训练计划资助项目(202111319006)
江西省教育厅科学技术研究项目(GJJ190980)。
关键词
桥梁健康监测
损伤识别
曲率模态
频率
bridge health monitoring
damage identification
curvature mode
frequency
