埋入式传感器在不同养护龄期混凝土应力监测中的优势
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中图分类号：TU317 文献标志码：A
Advantages of Embedded Sensors in Stress Monitoring for Concrete at Different Curing Ages
FAN Zhirui ，GU Chuanyao ，QIN Lei ， XU Weiwei ， SUN Ming ， DING Weijian
（1.School of Civil Engineering and Architecture，University of Jinan，Jinan 25OO22，Shandong，China; 2.Scholof TraficandEnvironment，Shenzhen Instituteof Information Technology，Shenzhen518172，Guangdong，China; 3.College of Engineering，Southern Universityof Scienceand Technology，Shenzhen，Guangdong，China）
Abstract：To meetrequirements of health monitoring for concrete structures，a kindof embedded sensors wereprepared according to thesensitive responsecharacteristic ofcoda interferometryto subtlechanges in internal damage of medium. Incombination withtraditional surfacecontactsensors，coda interferometry technologywasutilized to monitor stresof concrete specimens at diferent curing ages in three monitoring paterns.Phase change characteristics of codas in timedomain signalsof theconcretespecimens caused bythe stressvariation wereanalyzed，and variation regulationof coda relative wave velocityof concrete specimens at diffrent curing ages with stress was discussed.Theresults show that compared to traditional surface contact sensors，the decorelation coeffcient of the concrete samples monitored by using embedded sensors issmaller，andas thecuring age oftheconcrete specimens increases，thecoda relative wavevelocity ofthe concretespecimens graduallincreases.Itisindicated thattheembeddedsensorsaremoresensitivetoresponseof internal damage changes inconcrete andcan beter monitor stress.Effcts of embedded sensors oncompressve strength of theconcrete specimensare negligible，allowing theiruse for stress monitoring for concrete in actual projects without affecting strength of the concrete structure itself.
Keywords：stress monitoring；embedded sensor；coda interferometry；concrete；relative wave velocityofcoda；decorrelation coefficient
荷载和恶劣环境的影响使得混凝土结构不可避免地产生变形、缺陷，甚至倒塌[1]，及时、可重复地检测变形和初始缺陷可以降低累积损坏的高昂成本，并避免最终的结构失效。（剩余8489字）
