Dynamic performance analysis of a vibration-seismic control system for a metro-adjacent theatre

To address both vibration control and seismic safety for metro-adjacent buildings, this paper proposes a vibration-seismic control (VSC) system integrating steel spring isolators and limiters. The isolators mitigate vertical vibration, while the limiters provide lateral stiffness to restrain isolation layer displacement during earthquakes. Taking the Music Conservatory Theatre of the Chinese University of Hong Kong, Shenzhen (CUHK-SZ) as a case study, finite element models of three structural schemes (non-isolated, vibration-isolated, and VSC) are established to compare dynamic responses under rare earthquakes. Results show that steel springs effectively mitigate metro-induced vibrations, reducing the maximum vibration level and secondary noise by more than 20 dB/dB(A). With the integration of limiters, the VSC system retains vertical isolation performance while restricting the inter-story drift ratio to 2 %-3 %, meeting the design requirements. The proposed VSC system achieves synergy between vertical vibration isolation and horizontal seismic resistance, providing a reliable solution for acoustically sensitive buildings adjacent to metro corridors.