STUDY ON LOW-FREQUENCY VIBRATION ISOLATION PERFORMANCE OF STEEL SPRING FLOATING SLAB TRACK

Low-frequency vibration induced by metro trains could affect the working environment of sensitive instruments in the nearby buildings and cause great loss in economy and research. It is necessary to research the low-frequency vibration isolation performance of the existing measures. By using the 2D and 3D finite element models, the effectiveness of various steel spring floating slabs track (SSFST) in reducing vibration is studied. The conclusions indicate that the T-form and the normal SSFSTs are more efficient on the vibrations below 5Hz, whose isolation effect can be improved by changing the slab form and parameters. Only increasing the concrete gradation can improve the mitigation effect. The side and inside supporting SSFSTs have equal effectiveness, and choosing fewer but stiffer springs could make the SSFST more efficient. These conclusions may give reference to choice and design of SSFST in reducing low-frequency vibration.