Abstract
The most familiar civil engineering structure is reinforced concrete (RC) structure. Performance of structure undergoes changes during their service life with time. Thus, it is of great concern to monitor the health of RC structure. Structural health monitoring (SHM) is the art of detecting the changes in structure that influences its performance. Various techniques to monitor the health of structure are broadly studied worldwide. PZT based smart aggregate can play an effective role as an advanced tool in the development of structural health monitoring. This research work contributes for proposing a more generous Non-Destructive Evaluation (NDE) technique for structural health monitoring by using smart materials. If performance of a structure deviates from the design parameters with time, appropriate and effective maintenance is required. Considering the relevant need of RC structures, a more sensitive and cost-effective approach by using Electro-Mechanical Impedance (EMI) technique has been proposed for implementation in real-life situations. In general, surface bonded PZT transducer is used for SHM. Since PZT transducers are of very small dimension and brittle in nature, for consistent characteristics, they should be protected from severe environmental condition and other external interruptions. For this reason, PZT transducer is embedded in structure at the time of construction and manufacturing of the embedded transducer is simple. The proposed EMI technique assesses the health of RC structures more rationally by embedding PZT transducer in the structure, whose health is to be monitored over the user specified preset frequency range. The conductance and susceptance signatures are acquired by using LCR meter. At any future point of time, when it is desired to assess the health of structure, the conductance and susceptance signatures are acquired and further utilized for damage detection and quantification. The Root Mean Square Deviation (RMSD) is used to specify damage severity.
Highlights
Structures consist of an assembly of various members like columns, beams, slabs, etc
The specific objective of the present study is to carry out the structural health monitoring of structures using indigenously prepared embedded Piezo based Lead Zirconate Titanate (PZT) patches
Response for Healthy Condition of Embedded SMart AGgregate (SMAG) For the first stage, the healthy structure response is taken, with the SMAG embedded in supported reinforced concrete (RC) beam
Summary
Structures consist of an assembly of various members like columns, beams, slabs, etc. Piezoceramic transducer has been playing an important role in structural health monitoring. Any damage of the host structure reflects changes in its properties. Major damages to structures can lead to failures, causing inconvenience and safety problems. Numerous structural engineers drew attention towards developing modern sensor technology for making structures, smart enough to warn the concerned authorities before their failure in the recent decade years
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