INVESTIGATING THE SEISMIC RESPONSE ANDISOLATION OF THE STRUCTURE UNDER THE EFFECT OFTHE DYNAMIC LOAD OF URBAN TRAIN MOVEMENT

This study takes the indoor substation adjacent to the elevated bridge subway line as theengineering background, investigates the structural vibration response law of the substation inducedby the operation of the subway line through on-site vibration measurement, and proposes a novelnonlinear gas-spring quasi-zero stiffness isolator is proposed to reduce the structural vertical vibrationand further reduce the safety distance. When the substation structure is less than ۴۵ m from thesubway line, the structural response exceeds the safety limit (۱۲.۵ μm/s) of the VC-C standard. Withthe vibration isolator attached, the structural vibration response is significantly reduced, with the peakand root mean square response controlled by more than ۷۰%. Particularly, the safe distance of thesubstation from the subway line is reduced from ۴۵ m to ۲۰ m. Moreover, the frequency domain resultanalysis indicates that the proposed nonlinear vibration isolator can effectively control the lowfrequencyvibration of the structure.

کلیدواژه ها:

Indoor Substation Structure ، Subway-Induced Vibration ، Vibration Response Analysis ، Safe Distance ، Quasi-Zero Stiffness ، Nonlinear Isolator