Abstract
Viscous dampers are a type of seismic damping equipment widely used in high-rise buildings and bridges. However, the viscosity of the damping fluid inside the viscous damper will change over time during its use, which significantly reduces the seismic performance of the viscous damper. Hence, it is necessary to monitor the viscosity of the fluid inside the damper over its service life. In this paper, a damping fluid viscosity monitoring method based on wireless impedance measurement technology is proposed. A piezoelectric sensor is installed in a damper cylinder specimen, and the viscosity of the damping fluid is determined by measuring the piezoelectric impedance value of the sensor. In this study, 10 samples of damping fluids with different viscosities are tested. In order to quantitatively correlate damping fluid viscosity and electrical impedance, a viscosity index (VI) based on the root mean square deviation (RMSD) is proposed. The experimental results show that the variation of the real part in the impedance signal can qualitatively determine the damping fluid viscosity while the proposed VI can effectively and quantitatively identify the damping fluid viscosity.
Highlights
Traditional structures are designed to withstand natural disasters, such as earthquakes, strong winds, and tsunamis, by enhancing the seismic performance of the structure itself [1,2](e.g., improving strength, stiffness, and ductility)
This paper proposes a viscosity monitoring method for viscous damper liquids based on an innovative wireless impedance measurement system that is designed for practical use
In order to quantitatively represent the relationship between viscosity and the real impedance, this paper proposes a definition of the damping fluid viscosity damper viscosity index (VI) based on the root mean square error (RMSD)
Summary
Traditional structures are designed to withstand natural disasters, such as earthquakes, strong winds, and tsunamis, by enhancing the seismic performance of the structure itself [1,2](e.g., improving strength, stiffness, and ductility). Traditional structures are designed to withstand natural disasters, such as earthquakes, strong winds, and tsunamis, by enhancing the seismic performance of the structure itself [1,2]. To reduce the damage caused by earthquakes, various dampers or other vibration suppression technologies are usually applied in buildings or bridges as supplementary approaches to enhance the seismic performance of structures [4,5]. Madhekar studied the application of viscous dampers on highway bridges to reduce the bearing displacements and eliminate the isolator damage [6]. The dampers are often combined with the base isolators to improve the seismic reliability of structures [7,8]. Except passive vibration control technologies, active and semiactive approaches are developed in civil engineering to provide effective protection in earthquakes [9]. Baggio used the isolation technique to reduce the seismic action of the marble sculptures at the Accademia Gallery in Florence, where the sliders were on a small-size double concave curved surface [13]
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