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Smart Structures and Systems Volume 34, Number 5, November 2024 , pages 33-351 DOI: https://doi.org/10.12989/sss.2024.34.5.033 |
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Effect of mesoscale randomness of various aggregates on stress wave propagation for debond detection of RCFSTs |
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Jiang Wang, Bin Xu, Qian Liu, Ruiqi Guan, Xiaoguang Ma and Genda Chen
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| Abstract | ||
| Concrete core in concrete-filled steel tubes (CFSTs) is heterogeneous at mesoscale and the heterogeneity affects stress wave propagation within CFSTs. Coupling homogenization finite element models (CHFEMs) corresponding to traditional coupling mesoscale finite element models (CMFEMs) of rectangular CFSTs (RCFSTs) with randomly distributed elliptical and polygonal aggregates are established. The influences of concrete core heterogeneity and an interface debond defect on stress wave field and the responses of piezoelectric-lead-zirconate-titanate (PZT) sensors at different measurement distances are distinguished using homogenization finite element models (HFEMs) and the CHFEMs, respectively. A comparative test on thirty RCFST cross sections with and without an interface debond defect is performed to quantitatively evaluate the effect of concrete core heterogeneity on the responses of PZT sensors at different measurement distances and to distinguish it with that of the designed interface debond defect. Both mesoscale homogenization numerical simulation and test results show that the heterogeneity and mesoscale randomness of concrete core locally affect the response of PZT sensors that are close to the PZT actuator mounted on the surface of the steel tube of the CFSTs at certain levels. The influence of the interface debond defect on the stress wave fields within the cross sections of RCFSTs and the response of PZT sensors with measurement distances over 160 mm is dominant. The findings further illustrate the rationality of the interface debond defect detection method using stress wave measurement of PZT sensors with a suitable measurement distance for RCFSTs even concrete core in RCFSTs in practice is a heterogenous material with randomly distributed aggregates of different shapes at mesoscale. | ||
| Key Words | ||
| acoustic; concrete/reinforced concrete; dynamic analysis; experiment; finite element method; nondestructive evaluation; numerical material modelling; piezoelectric sensors and actuators; time domain | ||
| Address | ||
| (1) Jiang Wang, Bin Xu, Qian Liu, Ruiqi Guan: College of Civil Engineering, Huaqiao University, Xiamen 361021, China; (2) Bin Xu, Ruiqi Guan: Key Laboratory for Intelligent Infrastructures and Monitoring of Fujian Province (Huaqiao University), Xiamen 361021, China; (3) Xiaoguang Ma: Foshan Graduate School, Northeastern University, Foshan 528311, China; (4) Genda Chen: Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA; (5) Genda Chen: INSPIRE University Transportation Center, College of Engineering and Computing, Missouri University of Science and Technology, Rolla, MO 65401, USA. | ||