摘要
为了提高对桥梁结构损伤位置的识别精度及准确性,利用应变对结构局部损伤敏感的特性,提出了基于小波分析和变异系数的简支梁桥损伤识别新方法。在移动荷载作用下,对简支梁桥动态应变响应进行二进离散小波变换,将叠加在一起的多阶模态响应进行分离;根据差分法和统计参数,构建出低阶应变响应的变异系数双重曲率(Double Curvature of Variation Coefficient,DCVC)损伤指标。以简支梁桥作为研究对象,将所提方法通过有限元数值模拟和模型实验给予验证。研究结果表明:该方法成功摆脱了对健康结构响应数据的依赖,可以准确识别出简支梁桥不同位置不同程度的单处、多处损伤,且受移动荷载行驶速度的影响较小,在简支梁桥损伤识别研究中具有很好的识别效果。
In order to improve the identification precision and accuracy for damage position of bridge structure, a new method of damage identification for simply supported beam bridge based on wavelet analysis and variation coefficient is proposed by using the sensitivity of strain to structure local damage. Firstly, under the action of moving load, the binary discrete wavelet transform is carried out on the dynamic strain response signal of simply supported beam bridge, separating the multi-order modal response. And according to the difference principle and statistical parameter, the double curvature of the low frequency strain response variation coefficient(Double Curvature of Variation Coefficient, DCVC) is constructed as injury index. Taking the simply supported beam bridge as the research object, the proposed method is verified by finite element numerical simulation and model test. The results show that this method has successfully escaped the dependence on the health structure response, can accurately identify the single or multiple damage of the different positions for simply supported beam bridge, and isless affected by the driving speed of the moving load, which has a good identification effect in the damage identification for simply supported beam bridge.
作者
刘光耀
刘习军
张素侠
温立平
Liu Guangyao;Liu Xijun;Zhang Suxia;Wen Liping(School of Mechanical Engineering,Tianjin University,300354,Tianjin,China;Department of Geological Engineering,Institute of Disaster Prevention,065201,Sanhe,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2020年第5期1915-1922,I0005,I0006,共10页
Chinese Journal of Applied Mechanics
基金
天津市自然科学基金(17JCYBJC18700)
天津市交通运输科技发展计划项目(2018B-33)。
关键词
小波分析
简支梁桥
应变响应
变异系数
损伤识别
wavelet analysis
simply supported beam bridge
strain response
variation coefficient
damage identification
