Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Real-time Structural Health Monitoring Method based on the Electromechanical impedance approach applied on Concrete Structures
Submission Author:
Raquel Naiara Fernandes Silva , MG
Co-Authors:
Raquel Naiara Fernandes Silva, Karina Mayumi Tsuruta, Roberto Mendes Finzi Neto, Aldemir Ap Cavalini Jr, Valder Steffen Jr
Presenter: Raquel Naiara Fernandes Silva
doi://10.26678/ABCM.COBEM2017.COB17-1890
Abstract
In concrete structures, the appearance of cracks could occur due to the combination of residual stresses provoked by hydration, creep effects, retraction, and temperature effect. To control microcracking during loading and improve the mechanical properties and residual resistance to fracturing of these concrete structures, a steel fibers are incorporated into the concrete. It is important to mention that the use of steel reinforced concrete (CRFA) in civil structures has advantages when compared to traditional systems, such as: greater resistance to cavitation, improve the impact resistance and thermal shock, and increase the ductility. In this context, this paper aims to propose a new methodology for real time damage detection in concrete structures by using the method of structural heath monitoring based on the electromechanical impedance approach. This methodology uses piezoelectric transducers as sensor and actuator, which is embedded in the monitored structure. Due to the electromechanical coupling between the sensors and the structure, the presence of the damage in the structure changes the PZT patch electric impedance. In order to quantify this damage, damage metrics are used. In this work, a prismatic concrete specimen was made considering matrix with fck = 40 MPa and dosage of fibers corresponding to 60kg/m³ (0.77%). This prismatic specimen was subjected to the flexural toughness test in order to produce damages and consequently to identify and characterize them using the said SHM technique, the impedance measure are made during the tests.
Keywords
Structural Health Monitoring, Electromechanical Impedance approach, Piezoelectric transducers, Concrete Structures
