摘要
为了满足混凝土结构健康监测的需求,根据尾波干涉技术对介质内部损伤微小变化的反应灵敏的特性,制备一种埋入式传感器,结合传统外贴式传感器,采用尾波干涉技术,在3种监测模式下监测不同养护龄期混凝土试块的应力,分析应力变化引起的混凝土试块时域信号的尾波相位变化特性,并探讨不同养护龄期的混凝土试块尾波相对波速随应力的变化规律。结果表明:相对于传统外贴式传感器,埋入式传感器监测的混凝土试块的去相关系数较小,并且随着混凝土试块养护龄期的增加,混凝土试块的尾波相对波速逐渐增大,说明埋入式传感器对混凝土内部损伤变化的反应更灵敏,能更好地监测应力;埋入式传感器的埋入对不同养护龄期混凝土试块抗压强度的影响可忽略不计,可以用于实际工程中的混凝土应力监测而不影响混凝土结构自身强度。
To meet requirements of health monitoring for concrete structures,a kind of embedded sensors were prepared according to the sensitive response characteristic of coda interferometry to subtle changes in internal damage of medium.In combination with traditional surface contact sensors,coda interferometry technology was utilized to monitor stress of concrete specimens at different curing ages in three monitoring patterns.Phase change characteristics of codas in time-domain signals of the concrete specimens caused by the stress variation were analyzed,and variation regulation of coda relative wave velocity of concrete specimens at different curing ages with stress was discussed.The results show that compared to traditional surface contact sensors,the decorrelation coefficient of the concrete samples monitored by using embedded sensors is smaller,and as the curing age of the concrete specimens increases,the coda relative wave velocity of the concrete specimens gradually increases.It is indicated that the embedded sensors are more sensitive to response of internal damage changes in concrete and can better monitor stress.Effects of embedded sensors on compressive strength of the concrete specimens are negligible,allowing their use for stress monitoring for concrete in actual projects without affecting strength of the concrete structure itself.
作者
范志瑞
谷传耀
秦磊
徐伟伟
孙明
丁蔚健
FAN Zhirui;GU Chuanyao;QIN Lei;XU Weiwei;SUN Ming;DING Weijian(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;School of Traffic and Environment,Shenzhen Institute of Information Technology,Shenzhen 518172,Guangdong,China;College of Engineering,Southern University of Science and Technology,Shenzhen 518055,Guangdong,China)
出处
《济南大学学报(自然科学版)》
北大核心
2025年第5期750-758,769,共10页
Journal of University of Jinan(Science and Technology)
基金
国家自然科学基金项目(52308271)
深圳市高层次人才科研启动项目(RC2022-004)
2023年广东省普通高校特色创新类项目(2023KTSCX321)。
关键词
应力监测
埋入式传感器
尾波干涉技术
混凝土
尾波相对波速
去相关系数
stress monitoring
embedded sensor
coda interferometry
concrete
relative wave velocity of coda
decorrel-ation coefficient
作者简介
第一作者:范志瑞(1999-),男,山东临沂人。硕士研究生,研究方向为无损检测。E-mail:173650051@qq.com;通信作者:谷传耀(1971-),男,山东潍坊人。副教授,硕士,硕士生导师,研究方向为岩土锚固。E-mail:cea_gucy@ujn.edu.cn。
