The advances of dynamic stress monitoring of concrete structures using piezoelectric smart aggregate sensors
This paper summarizes the advances of dynamic stress monitoring of concrete using piezoelectric smart aggregate(SA)sensors.The fabrication of SA and shear SA(SSA)were firstly proposed,which consists of a piece of PZT patch sandwiched between a pairs of granite hemi-cubes,and the performance of the SA and SSA was tested.Secondly,the charge amplifier for seismic stress monitoring of SA in concrete was developed to solve the problem of commercial charge amplifier in terms of lower frequency limit and maximum charge input.By using this charge amplifier,the SA was tested at three static stress levels with the maximum amplitude up to 45 MPa.Thirdly,the SA was calibrated in three types of concrete,which are normal strength concrete,high-strength concrete and lightweight concrete.The sensitivity curves and the coefficient of variation of SA output were obtained in pre-and postpeak stage,respectively.At last,to verify the feasibility of SA for dynamic stress monitoring in RC members,the SA embedded in three reinforced concrete(RC)columns were tested.It can be concluded that the SA have the potential to monitor the dynamic stress of concrete structures during their full damage process.
Concrete structure Smart aggregate Structural health monitoring Dynamic stress
S.Hou H.B.Zhang J.P.Ou
State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou, Shenzhen Graduate School,Harbin Institute of Technology,Shenzhen,China;Key Lab of Structures Dynamic
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
2647-2656
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）