Numerical and Experimental Verification of a Multiple-Variable Spatiotemporal Regression Model for Grout Defect Identification in a Precast Structure

Due to the increased service life, environmental corrosion, unreasonable construction, and other issues, local defects inevitably exist in civil structures, which affect the structural performance and can lead to structural failure. However, research on grout defect identification of precast reinfor...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-06, Vol.20 (11), p.3264
Main Authors: Zhang, Xuan, Tang, Hesheng, Zhou, Deyuan, Chen, Shanshan, Zhao, Taotao, Xue, Songtao
Format: Article
Language:English
Subjects:
Algorithms
Beam-columns
beam–column connection
Columnar structure
Computer simulation
Concrete
concrete frame structure
damage indicator
Experiments
Frame structures
Grout
Identification
linear regression model
local defect identification
Methods
Nondestructive testing
Precast concrete
Regression analysis
Reinforced concrete
Service life
Simulation
Sleeves
Statistical analysis
Structural failure
Structural vibration
Variables
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Summary:Due to the increased service life, environmental corrosion, unreasonable construction, and other issues, local defects inevitably exist in civil structures, which affect the structural performance and can lead to structural failure. However, research on grout defect identification of precast reinforced concrete frame structures with rebars spliced by sleeves faces great challenges owing to the complexity of the problem. This study presents a multiple-variable spatiotemporal regression model algorithm to identify local defects based on structural vibration responses collected using a sensor network. First, numerical simulations were carried out on precast beam–column connection models by comparing the identification results based on a single-variable regression model, two-variable spatial regression model, and two-variable spatiotemporal regression model; furthermore, a multiple-variable spatiotemporal regression model was proposed and robustness analysis of the damage indicator was carried out. Then, to explore the validity of the proposed method, a nondestructive vibration experiment was considered on a half-scaled, two-floor, precast concrete frame structure with column rebars spliced by defective grout sleeves. The results show that local defects were successfully identified based on a multiple-variable spatiotemporal regression model.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20113264