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.
Highlights
Piezoceramic material has characteristics of fast response, high sensitivity, good linearity, low cost, and sensing and actuating capacity
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
15, and the figure reveals that the greater the drop height, the greater the output aggregate, and there is a clear non-linearity in the relationship between sensor response and drop value piezoceramic smart aggregate, and is the a clear non-linearityofinsand the can relationship between height.ofThe reason for this phenomenon maythere be that compressibility cause attenuation sensor response and drop height
Summary
Piezoceramic material has characteristics of fast response, high sensitivity, good linearity, low cost, and sensing and actuating capacity. Yan et al proposed a piezoceramic smart aggregate-based approach for the concrete compactness monitoring of concrete-filled steel tube (CFST) columns [14]. There is no research on the internal stress monitoring of sand-filled steel tube column structures under impact loadings. Filling ofto thestudy thin-wall feasibility of monitoring thecan internal stress a structure These tests could the The foundation forfirst the steel tube with quartz sand prevent theofpremature buckling of the steellay tube. SAs were stress monitoring the piezoceramic smart aggregate buried in to thestudy concrete-filled steeloftube column calibrated using anofimpact force hammer. These tests could lay the foundation for the stress monitoring of the piezoceramic smart aggregate buried in the concrete-filled steel tube column in the later stage
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