A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fatigue damage and residual fatigue life assessment in reinforced concrete frames using PZT-impedance transducers
Abstract Structural health monitoring has contrived a path for ascertaining the condition of any structure under operating or critical loads. This paper investigates a possible application of the electro-mechanical impedance (EMI) technique in diagnosing high-cycle and low-strain fatigue damage in the reinforced concrete (RC) structures. The experimental study is conducted on a RC frame structure of overall size 1.45 m (width) x 1.22 m (height) using lead zirconate titanate (PZT) patches embedded in form of concrete vibration sensors (CVS), all operating in d-31 mode, for accessing fatigue damages till the structure fails at 5.5 million cycles. The damage dependent equivalent stiffness parameters (ESP) are obtained from the conductance and the susceptance signatures for each CVS at different damage states for enabling the estimation of residual fatigue life. For the first time, results have revealed a good comparison in obtaining flexural rigidity-based stiffness using global dynamic technique (GDT) and CVS-identified stiffness using EMI technique for the full-life span of the RC structure under high-cycle fatigue. A relation for estimating residual fatigue life of the structure with change in normalized damping has been also derived for this type of loading environment.
Highlights Fatigue induced damage prognosis in RC frames is performed. PZT transducers embedded in RC frame are used as actuators as well as sensors. EMI technique in parallel to GDT is used to monitor and analyse the health of RC frame. Results are validated for all the three phases of fatigue life span of RC structure. Life prediction models based on residual stiffness and damping are proposed.
Fatigue damage and residual fatigue life assessment in reinforced concrete frames using PZT-impedance transducers
Abstract Structural health monitoring has contrived a path for ascertaining the condition of any structure under operating or critical loads. This paper investigates a possible application of the electro-mechanical impedance (EMI) technique in diagnosing high-cycle and low-strain fatigue damage in the reinforced concrete (RC) structures. The experimental study is conducted on a RC frame structure of overall size 1.45 m (width) x 1.22 m (height) using lead zirconate titanate (PZT) patches embedded in form of concrete vibration sensors (CVS), all operating in d-31 mode, for accessing fatigue damages till the structure fails at 5.5 million cycles. The damage dependent equivalent stiffness parameters (ESP) are obtained from the conductance and the susceptance signatures for each CVS at different damage states for enabling the estimation of residual fatigue life. For the first time, results have revealed a good comparison in obtaining flexural rigidity-based stiffness using global dynamic technique (GDT) and CVS-identified stiffness using EMI technique for the full-life span of the RC structure under high-cycle fatigue. A relation for estimating residual fatigue life of the structure with change in normalized damping has been also derived for this type of loading environment.
Highlights Fatigue induced damage prognosis in RC frames is performed. PZT transducers embedded in RC frame are used as actuators as well as sensors. EMI technique in parallel to GDT is used to monitor and analyse the health of RC frame. Results are validated for all the three phases of fatigue life span of RC structure. Life prediction models based on residual stiffness and damping are proposed.
Fatigue damage and residual fatigue life assessment in reinforced concrete frames using PZT-impedance transducers
Haq, Moinul (author) / Bhalla, Suresh (author) / Naqvi, Tabassum (author)
2020-08-01
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2018
| British Library Online Contents | 2018
Fatigue Life Assessment of Reinforced Concrete and Composite Bridges
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RESIDUAL PERFORMANCE OF FATIGUE CRACKED FIBRE REINFORCED CONCRETE
| British Library Conference Proceedings | 2005