Abstract
Concrete-filled square steel tube column (CFSSTC) joints are the most important parts of concrete-filled steel tube frame structures. It is of great significance to study the damage of CFSSTC joints under the seismic loads. In this paper, embedded piezoceramic transducers are used to monitor the damage of core concrete of CFSSTC joints under cyclic loading and surface-bonded piezoceramic disks are used to monitor the debonding damage of the steel tube and core concrete of two specimens. The damages of the joints under different loading levels and different loading cycles are evaluated by the received signal of the piezoceramic transducers. The experimental results show that the amplitude of the signal attenuates obviously with the appearance of damage in the joints, and the degree of attenuation increases with the development of the damage. The monitoring results from piezoceramic transducers are basically consistent with the hysteresis loops and skeleton curves of the CFSSTC joints during the cyclic loading. The effectiveness of the piezoceramic transducers are verified by the experimental results in structural health monitoring of the CFSSTC joint under cyclic loading.
Highlights
Concrete-filled steel tube structures are being widely applied in civil engineering [1,2,3,4,5].Concrete-filled square steel tube column (CFSSTC) joints are the most important parts of concrete filled steel tube frame structures
The effectiveness of the piezoceramic transducers are verified by the experimental results in structural health monitoring of the concrete-filled square steel tube column (CFSSTC) joint under cyclic loading
It must History be noted that loading should be stopped if one of the following conditions is reached: It must be noted that loading should be stopped if one of the following conditions is reached: (1) the steel beam in theshould core area of the joint is completely broken or severely buckled
Summary
Concrete-filled steel tube structures are being widely applied in civil engineering [1,2,3,4,5]. Zhang et to detection of a concrete to piezoelectric blast loads using embedded piezoceramic smart al.damage [56] used the active sensing column methodsubjected based on smart aggregates to monitor the aggregates (SAs). The aggregates are embedded in the core area of the joint transducer is and bonded piezoceramically-enabled active sensing method is and usedthe to piezoceramic monitor the disk concrete damage the on the outer surface of the steel tube. The piezoceramically-enabled active sensing method is used steel tube debonding in the core area of the joint under low cyclic loading. To monitor the concrete damage and the steel tube debonding in the core area of the joint under low cyclic loading. Upon from aS1 signal from a function generator with amplification, theare piezoelectric piezoelectric actuator in the concrete core generates stress waves, which to the based excitation on piezoceramically-enabled active sensing approaches are presented intransmitted.
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