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Sensors 2017, 17(8), 1930; https://doi.org/10.3390/s17081930

Experimental Study on Stress Monitoring of Sand-Filled Steel Tube during Impact Using Piezoceramic Smart Aggregates

1
School of Urban Construction, Yangtze University, Jingzhou 434000, China
2
Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA
The author contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 12 July 2017 / Revised: 9 August 2017 / Accepted: 10 August 2017 / Published: 22 August 2017
(This article belongs to the Section Physical Sensors)
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Abstract

The filling of thin-walled steel tubes with quartz sand can help to prevent the premature buckling of the steel tube at a low cost. During an impact, the internal stress of the quartz sand-filled steel tube column is subjected to not only axial force but also lateral confining force, resulting in complicated internal stress. A suitable sensor for monitoring the internal stress of such a structure under an impact is important for structural health monitoring. In this paper, piezoceramic Smart Aggregates (SAs) are embedded into a quartz Sand-Filled Steel Tube Column (SFSTC) to monitor the internal structural stress during impacts. The piezoceramic smart aggregates are first calibrated by an impact hammer. Tests are conducted to study the feasibility of monitoring the internal stress of a structure. The results reflect that the calibration value of the piezoceramic smart aggregate sensitivity test is in good agreement with the theoretical value, and the output voltage value of the piezoceramic smart aggregate has a good linear relationship with external forces. Impact tests are conducted on the sand-filled steel tube with embedded piezoceramic smart aggregates. By analyzing the output signal of the piezoceramic smart aggregates, the internal stress state of the structure can be obtained. Experimental results demonstrated that, under the action of impact loads, the piezoceramic smart aggregates monitor the compressive stress at different locations in the steel tube, which verifies the feasibility of using piezoceramic smart aggregate to monitor the internal stress of a structure. View Full-Text
Keywords: Sand Filled Steel Tube Column (SFSTC); Smart Aggregate (SA); piezoceramics; calibration; impact loads; stress monitoring during impacts Sand Filled Steel Tube Column (SFSTC); Smart Aggregate (SA); piezoceramics; calibration; impact loads; stress monitoring during impacts
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Du, G.; Zhang, J.; Zhang, J.; Song, G. Experimental Study on Stress Monitoring of Sand-Filled Steel Tube during Impact Using Piezoceramic Smart Aggregates. Sensors 2017, 17, 1930.

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