A PVDF-Based Sensor for Internal Stress Monitoring of a Concrete-Filled Steel Tubular (CFST) Column Subject to Impact Loads
Autor: | Guofeng Du, Zhao Li, Gangbing Song |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Waterproofing
Materials science Piezoelectric sensor 02 engineering and technology lcsh:Chemical technology Biochemistry Article Analytical Chemistry law.invention Stress (mechanics) chemistry.chemical_compound 0203 mechanical engineering piezoelectric sensor law concrete-filled steel tubular (CFST) column lcsh:TP1-1185 Hammer Electrical and Electronic Engineering PVDF (Polyvinylidene Fluoride) impact sensor embeddable sensor impact test internal stress monitoring Instrumentation business.industry Structural engineering Epoxy 021001 nanoscience & nanotechnology Piezoelectricity Polyvinylidene fluoride Atomic and Molecular Physics and Optics 020303 mechanical engineering & transports chemistry visual_art visual_art.visual_art_medium 0210 nano-technology business Test data |
Zdroj: | Sensors (Basel, Switzerland) Sensors; Volume 18; Issue 6; Pages: 1682 Sensors, Vol 18, Iss 6, p 1682 (2018) |
ISSN: | 1424-8220 |
Popis: | Impact loads can have major adverse effects on the safety of civil engineering structures, such as concrete-filled steel tubular (CFST) columns. The study of mechanical behavior and stress analysis of CFST columns under impact loads is very important to ensure their safety against such loads. At present, the internal stress monitoring of the concrete cores CFST columns under impact loads is still a very challenging subject. In this paper, a PVDF (Polyvinylidene Fluoride) piezoelectric smart sensor was developed and successfully applied to the monitoring of the internal stress of the concrete core of a CFST column under impact loads. The smart sensor consists of a PVDF piezoelectric film sandwiched between two thin steel plates through epoxy. The protection not only prevents the PVDF film from impact damages but also ensures insulation and waterproofing. The smart sensors were embedded into the circular concrete-filled steel tube specimen during concrete pouring. The specimen was tested against impact loads, and testing data were collected. The time history of the stress obtained from the PVDF smart sensor revealed the evolution of core concrete internal stress under impact loads when compared with the impact force–time curve of the hammer. Nonlinear finite element simulations of the impact process were also carried out. The results of FEM simulations had good agreement with the test results. The results showed that the proposed PVDF piezoelectric smart sensors can effectively monitor the internal stress of concrete-filled steel tubular columns under impact loads. |
Databáze: | OpenAIRE |
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