In-Structure Response Spectra of an Auxiliary Building in a Nuclear Power Plant Considering Equipment–Structure Interaction

A two-degree-of-freedom (two-DOF) equation of motion was derived in the frequency domain using a substructuring technique for efficiently calculating in-structure response spectrum (ISRS) considering equipment–structure interaction. The model primary structure condensed into mechanical impedance function and combined with equipment represented by single-degree-of-freedom oscillator domain. This two-DOF system is applied to efficient calculation ISRS interaction without repeated analysis coupled full DOFs. procedure finite element an auxiliary building nuclear power plant validate both accuracy impact on response. Finally, adequacy three representative decoupling criteria necessity investigated applying those example.