Basement Design for Vibration Reduction of High-Rise Buildings under Metro Operation

摘要

Vibration induced by metro operation on the underground line is transmitted to the buildings above the line, which adversely affects on the normal life and work of human in the building. To study this problem, based on the plate-shell vibration theory, a plate-column-plate coupled model is constructed to analyze the influence of plate thickness, plate elastic modulus and column arrangement on the vibration in mechanism firstly. Relying on a practical engineering problem, two models are established, namely a train-track coupled dynamic model and a monolithic track bed-tunnel-soil-building model, loading fastener force from the train-track coupled dynamic model on the monolithic track bed, vibration propagates to high-rise building through soil-building coupling. Field test is conducted to verify the reliability of the numerical model. On the basis, the vibration law of building under different basement floor thicknesses, basement floor material and arrangement of non-permanent columns are studied. Results show that changing the basement design parameters has different effects. The Z vibration level of building floor decreases with the increase of basement floor thickness. Basement floor thickness increases by 0.02 m, the Z vibration level of the floor decreased by 1.4 - 2.2 dB at most. The decrease of elastic modulus leads to a slight decrease of the Z vibration level of building, the change is less than 1 dB. Without changing the arrangement of basement load-bearing columns, reducing non-permanent structural columns significantly reduces the Z vibration level, with attenuation of up to 5.1 dB.