For numerical analysis or shaking table tests of in-cabinet equipment, in-cabinet response spectrum (ICRS) is commonly adopted as seismic demand. Several kinds of simplified concepts are mainly used to obtain ICRS. One of the concepts is using floor response spectrum multiplied by the in-cabinet amplification factor (AF). Other concepts generate ICRSs from FRS (floor response spectra) by frequency or time domain analysis. In this paper, a simplified numerical method to establish more realistic ICRS for motor control center (MCC) type cabinets is proposed based on the observation of shaking table test results. Global modes are simulated by a lumped-mass model, and local modes are simulated by a detailed finite element model of the plate at which in-cabinet equipment is anchored. Analysis results of the simplified model are compared with shaking table test and other analysis methods.
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