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论文类型：期刊论文

发表时间：2018-02-01

发表刊物：SMART MATERIALS AND STRUCTURES

收录刊物：SCIE、EI

卷号：27

期号：2

ISSN号：0964-1726

关键字：smart concrete structures; tubular piezoceramic transducers; delay-and-sum imaging method; damage imaging; active acoustic sources monitoring; structural health monitoring

摘要：The objective of this study is to develop a new concept and methodology of smart concrete slab (SCS) with embedded tubular lead zirconate titanate transducer array for image based damage detection. Stress waves, as the detecting signals, are generated by the embedded tubular piezoceramic transducers in the SCS. Tubular piezoceramic transducers are used due to their capacity of generating radially uniform stress waves in a two-dimensional concrete slab (such as bridge decks and walls), increasing the monitoring range. A circular type delay-and-sum (DAS) imaging algorithm is developed to image the active acoustic sources based on the direct response received by each sensor. After the scattering signals from the damage are obtained by subtracting the baseline response of the concrete structures from those of the defective ones, the elliptical type DAS imaging algorithm is employed to process the scattering signals and reconstruct the image of the damage. Finally, two experiments, including active acoustic source monitoring and damage imaging for concrete structures, are carried out to illustrate and demonstrate the effectiveness of the proposed method.