Active tuning of flexural wave in periodic steel-concrete composite beam with shunted cement-based piezoelectric patches

In this paper, flexural wave in a steel-concrete composite beam with periodically surface-bonded cement-based piezoelectric patches (CPP) is studied. The composite beam is designed using the idea of the phononic crystals. The external capacitor shunt circuit is connected to the CPP for regulating the band gap of the composite beam. The flexural wave equations are established by Euler beam theory. Using plane wave expansion method and transfer matrix method, the complex band structures of the flexural wave are calculated to investigate the frequency range and the vibration reduction in band gap. From the numerical results, it is shown that by tuning the external capacitor shunt circuit, the band gap of the periodic structure can be regulated conveniently. The regulation capability of the negative capacitance shunt circuit is stronger than that of the positive capacitance. We can obtain different starting low-frequency and wide band gaps by using negative capacitance. The proposed approach gives a promising way to design intelligent beams whose band gaps can be tuned without modifying the structures.

Automated summary

This paper studies the flexural wave in a steel-concrete composite beam with periodically surface-bonded cement-based piezoelectric patches. The idea of phononic crystals is used to design the composite beam. The band gap of the beam can be regulated by connecting an external capacitor shunt circuit to the piezoelectric patches. The results show that the negative capacitance shunt circuit has a stronger regulation capability than the positive capacitance. This approach provides a promising way to design intelligent beams with tunable band gaps without modifying the structures.