Detection of Corrosion-Induced Damage in Bolted Steel Structure Using Piezoceramic Transducers
Publication: Earth and Space 2022
ABSTRACT
Bolted steel structures may be subjected to many adverse effects, such as corrosion, vibration, shock, and seismic excitation, which reduce the strength of the bolted connection and thereby weaken the whole structure. Therefore, monitoring the health of bolted connections is very important in ensuring the safety of structures. In this paper, a two-story bolted steel frame with braces was used in the detection of damage to a bolted connection. The piezoelectric-based active sensing method was utilized to evaluate the damage condition of the connection. Various degrees of corrosion and bolt loosening in various positions were simulated during the test to verify the effectiveness of the proposed method. Both the impact waves and the sinusoidal excitation waves produced by impact test and a piezoceramic actuator respectively, provided active sensing stress waves. The continuous wavelet transform was adopted to process the received piezoelectric signal and to evaluate the damage index. The energy-based damage index was used to predict the severity of damage to a bolted joint, allowing slightly corroded bolts to be accurately detected. This work reveals that the health status of the bolted connection is influenced by the severity of corrosion of the bolt, and the presented diagnostic method is effective in monitoring the severity of corrosion and the degree of bolt loosening of a bolted connection.
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Earth and Space 2022
Pages: 616 - 627
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Published online: Jan 5, 2023
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