Metro-induced low frequency vibration reduction design of basement structural column of near rail buildings

In order to suppress the metro-induced low frequency vibration, the vibration reduction design of the basement structural column was presented based on the actual engineering background. Based on the vehicle-track coupling dynamics theory, a metro-induced low-frequency vibration prediction model for near-track high-rise buildings was established by considering nonlinear factors such as medium-high frequency vibration of wheel-rail caused by shortwave random irregularity, layered characteristics of soil, and artificial viscoelastic boundary. Ground vibration attenuation law test and the metro-induced basement vibration characteristic test were carried out to verify the effectiveness of the proposed vibration prediction model. The suppression effects of four vibration reduction schemes, i. e., optimal arrangement of non-permanent columns in basement, embedded disc spring vibration isolation bearing, rubber vibration isolation bearing, and fly ash bearing in non-permanent columns, on metro-induced low-frequency vibration were studied. The results show that the optimization design of the structural column can suppress the metro-induced low-frequency vibration in different degrees. Reducing the non-permanent columns in the basement can reduce the overall structural stiffness of the basement, and therefore reduce the vibration transmitted to the high-rise building. The setting of disc spring isolation bearing mainly attenuates the vibration within the 63-125 Hz frequency section of the basement partition, and the maximum z-vibration level of the high-rise building attenuates by 7. 3 dB at most. The setting of rubber vibration isolation bearing mainly attenuates the vibration of the basement partition in 40-125 Hz frequency section, and the maximum z-vibration level of the high-rise building attenuates by up to 7. 6 dB. The setting of fly ash bearing mainly attenuates the vibration of the 40-125 Hz frequency section of the basement partition, and the maximum z-vibration level of the high-rise building is attenuated by 5. 4 dB. For this practical project, the effect of structural column embedded rubber bearing is the best. © 2024 Science Press. All rights reserved.