基于嵌入式传感技术的混凝土结构概率损伤成像方法
Probabilistic damage imaging approach of concrete structures based on embedded sensing technology
张明辉 1周德源 1何斌 2陈洪兵 3孔庆钊4
作者信息
- 1. 同济大学结构防灾减灾工程系,上海 200092
- 2. 同济大学电子与信息工程学院,上海 200092
- 3. 北京科技大学土木与资源工程学院,北京 100083
- 4. 同济大学结构防灾减灾工程系,上海 200092;上海韧性城市与智能防灾工程技术研究中心,上海 200092
- 折叠
摘要
混凝土结构损伤的早期预警与精准量化是土木工程结构健康监测领域的热点.提出了一种基于嵌入式传感技术的混凝土结构概率损伤成像方法,通过对混凝土材料中骨料、砂浆基体以及界面过渡区的二维细观有限元建模,揭示了探测应力波在不均匀性混凝土材料及损伤界面的传播机制.结合传感器阵列的损伤可视化机理,设计了一种嵌入式压电传感器阵列模块,为精准量化混凝土损伤,结合概率损伤成像方法,通过基线相减法和希尔伯特变换从探测信号中提取损伤散射波的传播时间信息,引入累积分布函数,实现对混凝土损伤区域的可视化重构.试验结果表明,嵌入式传感模块可实现对混凝土结构的三维损伤成像,且识别出损伤中心位置与真实损伤中心位置在二维投影面上的误差为1.0 cm,验证了该方法对混凝土损伤感知的有效性与准确性.相比于现有嵌入式稀疏分布传感器,多传感单元集成的阵列模块可明显提升对混凝土局部损伤的探知能力,同时降低传感器系统在服役期的运维成本.
Abstract
Early warning and accurate quantification of the concrete structure damage is a hotspot in the field of structural health monitoring(SHM)in civil engineering.In this paper,a probabilistic damage imaging method for concrete structures based on embedded sensing technology was proposed.Through two-dimensional meso-level finite element modeling of the aggregate,mortar matrix and interface transition zone in concrete material,the propagation mechanism of probing stress waves in inhomogeneous concrete material and damage interfaces was revealed.Combined with damage visualization mechanism of transducer array,an embeddable piezoelectric transducer array module was designed.In order to accurately quantify concrete damage,combined with probabilistic damage imaging method,the damage information of propagation time was extracted from the probing signal by baseline subtraction method and Hilbert transform,and the cumulative distribution function was introduced to realize visual reconstruction of concrete damage area.The experimental results show that the embeddable transducer array module could achieve three-dimensional damage imaging of concrete structures,and the error between the identified damage center location and the real damage center location on the two-dimensional projection plane is 1.0 cm,which verifies the effectiveness and accuracy of the method for concrete damage perception.Compared with the existing embeddable sparse distribution transducers,the array-based module with integrated multiple sensing units can significantly improve the detection capability of concrete local damage,and reduce the operation and maintenance cost of the transducer system during the service life.
关键词
结构健康监测/混凝土结构/细观有限元模型/压电传感器/嵌入式压电传感阵列模块/概率损伤成像Key words
structural health monitoring/concrete structure/meso-level finite element model/piezoelectric transducer/embeddable piezoelectric transducer array module/probabilistic damage diagnostic imaging引用本文复制引用
基金项目
国家自然科学基金国际(地区)合作与交流重点项目(52020105005)
国家自然科学基金面上项目(51978507)
出版年
2024
国家科技期刊平台
NSTL
万方数据