Abstract
In recent years, earthquakes have caused more damage to nonstructural components, such as mechanical and electrical equipment and piping systems, than to structural components. In particular, among the nonstructural components, the electrical cabinet is an essential piece of equipment used to maintain the functionality of critical facilities such as nuclear and non-nuclear power plants. Therefore, damage to the electrical cabinet associated with the safety of the facility can lead to severe accidents related to loss-of-life and property damage. Consequently, the electrical cabinet system must be protected against strong ground motion. This paper presents an exploratory study of dynamic characteristics of seismically isolated remote terminal unit (RTU) cabinet system subjected to tri-axial shaking table, and also the shaking table test of the non-seismically isolated cabinet system was conducted to compare the vibration characteristics with the cabinet system installed with friction pendulum isolator device. In addition, for the shaking table test, two recorded earthquakes obtained from Korea and artificial earthquakes based on the common application of building seismic-resistant design standards as an input ground motions were applied. The experimental assessment showed that the various damage modes such as door opening, the fall of the wire mold, and damage to door lock occurred in the RTU panel fixed on the concrete foundation by a set anchor, but the damage occurred only at the seismic isolator in the seismically isolated RTU panel system. Furthermore, it was considered that the application of the seismic isolator can effectively mitigate the impact and amplification of seismic force to the RTU panel system during and after strong ground motions in this study.
Highlights
The frequency of earthquakes with a moment magnitude greater than 5.0 has been continuously increasing worldwide
This paper presents the characteristics of vibration transmissibility of seismically isolated electrical cabinet systems associated with ICC-ES AC 156 using a triaxial shaking table
The results of the shaking table test indicate that the deformation of the lower panel in the remote terminal unit (RTU) can be effectively mitigated by the installation of the seismic isolator, with over 99% maximum reduction rate
Summary
The frequency of earthquakes with a moment magnitude greater than 5.0 has been continuously increasing worldwide. Seismic isolation devices, such as natural rubber bearings (NRBs), high-damping rubber bearings (HDRBs), and friction pendulum systems (FPSs), are utilized for reducing the influence of seismic excitation on the structures This is because these devices can increase the natural period of the superstructures owing to the installation between the bottom of the superstructure and the boundary area of the foundation during a strong ground motion [13]. Based on the Seismic Building Design Code and Commentary (Korean Building Code) [28], essential non-structural components, such as mechanical and electrical equipment, that must remain functional during and after strong ground motion are required to prove their seismic performance through a shaking table test. Once the vibration characteristics under various types of ground motion, including artificial and recorded earthquakes, are determined, the behavior of the anchored electrical cabinet system on the concrete slab is compared with that of a seismically isolated electrical cabinet using an FPS
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