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Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers

Some of the most severe structural loadings come in the form of blast loads, which may be caused by severe accidents or even terrorist activities. Most commonly after exposure to explosive forces, a structure will suffer from different degrees of damage, and even progress towards a state of collapse...

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Autores principales: Xu, Kai, Deng, Qingshan, Cai, Lujun, Ho, Siuchun, Song, Gangbing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5982847/
https://www.ncbi.nlm.nih.gov/pubmed/29710807
http://dx.doi.org/10.3390/s18051377
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author Xu, Kai
Deng, Qingshan
Cai, Lujun
Ho, Siuchun
Song, Gangbing
author_facet Xu, Kai
Deng, Qingshan
Cai, Lujun
Ho, Siuchun
Song, Gangbing
author_sort Xu, Kai
collection PubMed
description Some of the most severe structural loadings come in the form of blast loads, which may be caused by severe accidents or even terrorist activities. Most commonly after exposure to explosive forces, a structure will suffer from different degrees of damage, and even progress towards a state of collapse. Therefore, damage detection of a structure subject to explosive loads is of importance. This paper proposes a new approach to damage detection of a concrete column structure subjected to blast loads using embedded piezoceramic smart aggregates (SAs). Since the sensors are embedded in the structure, the proposed active-sensing based approach is more sensitive to internal or through cracks than surface damage. In the active sensing approach, the embedded SAs act as actuators and sensors, that can respectively generate and detect stress waves. If the stress wave propagates across a crack, the energy of the wave attenuates, and the reduction of the energy compared to the healthy baseline is indicative of a damage. With a damage index matrix constructed by signals obtained from an array of SAs, cracks caused by blast loads can be detected throughout the structure. Conventional sensing methods such as the measurement of dynamic strain and acceleration were included in the experiment. Since columns are critical elements needed to prevent structural collapse, knowledge of their integrity and damage conditions is essential for safety after exposure to blast loads. In this research, a concrete column with embedded SAs was chosen as the specimen, and a series of explosive tests were conducted on the column. Experimental results reveal that surface damages, though appear severe, cause minor changes in the damage index, and through cracks result in significant increase of the damage index, demonstrating the effectiveness of the active sensing, enabled by embedded SAs, in damage monitoring of the column under blast loads, and thus providing a reliable indication of structural integrity in the event of blast loads.
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spelling pubmed-59828472018-06-05 Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers Xu, Kai Deng, Qingshan Cai, Lujun Ho, Siuchun Song, Gangbing Sensors (Basel) Article Some of the most severe structural loadings come in the form of blast loads, which may be caused by severe accidents or even terrorist activities. Most commonly after exposure to explosive forces, a structure will suffer from different degrees of damage, and even progress towards a state of collapse. Therefore, damage detection of a structure subject to explosive loads is of importance. This paper proposes a new approach to damage detection of a concrete column structure subjected to blast loads using embedded piezoceramic smart aggregates (SAs). Since the sensors are embedded in the structure, the proposed active-sensing based approach is more sensitive to internal or through cracks than surface damage. In the active sensing approach, the embedded SAs act as actuators and sensors, that can respectively generate and detect stress waves. If the stress wave propagates across a crack, the energy of the wave attenuates, and the reduction of the energy compared to the healthy baseline is indicative of a damage. With a damage index matrix constructed by signals obtained from an array of SAs, cracks caused by blast loads can be detected throughout the structure. Conventional sensing methods such as the measurement of dynamic strain and acceleration were included in the experiment. Since columns are critical elements needed to prevent structural collapse, knowledge of their integrity and damage conditions is essential for safety after exposure to blast loads. In this research, a concrete column with embedded SAs was chosen as the specimen, and a series of explosive tests were conducted on the column. Experimental results reveal that surface damages, though appear severe, cause minor changes in the damage index, and through cracks result in significant increase of the damage index, demonstrating the effectiveness of the active sensing, enabled by embedded SAs, in damage monitoring of the column under blast loads, and thus providing a reliable indication of structural integrity in the event of blast loads. MDPI 2018-04-28 /pmc/articles/PMC5982847/ /pubmed/29710807 http://dx.doi.org/10.3390/s18051377 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xu, Kai
Deng, Qingshan
Cai, Lujun
Ho, Siuchun
Song, Gangbing
Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers
title Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers
title_full Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers
title_fullStr Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers
title_full_unstemmed Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers
title_short Damage Detection of a Concrete Column Subject to Blast Loads Using Embedded Piezoceramic Transducers
title_sort damage detection of a concrete column subject to blast loads using embedded piezoceramic transducers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5982847/
https://www.ncbi.nlm.nih.gov/pubmed/29710807
http://dx.doi.org/10.3390/s18051377
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