Test And Analysis Of Vibration Caused By The Subway Train And Numerical Simulation Analysis Of Building

In order to relieve the pressure on urban road traffic congestion, construction of urban subway traffic is rapidly developed not only in the first-tier cities, but also in some second-tier cities. But subway train vibration brings some negative problems such as environment and noise pollution which has aroused people’s wide attention. There is no system research combined with all aspects of the measurement, simulation and theoretical analysis in the study of the past and the result has certain limitations. In this paper, the research is based on urban train free-field and building. This thesis will combine the measured data with the finite element models to research the subway vibration and analyze the influence of subway operation to buildings. The main research contents are as follows:(1)The propagation of the environmental vibration is studied in field measurement. The propagation law of vertical vibration caused by subway is got from the analysis of measured data in time domain and frequency domain analysis. The analysis results proved that ground surface vibration is amplified at a certain distance away from tunnel center. The vibration wave caused by subway operation and each spectrum distribution are got in frequency domain analysis. The measured results can provide a reference for the isolation and reduction of vibrations in buildings.(2) The acceleration time history curve of the vertical direction and horizontal direction of floor vibration is got from the field measurement of a building structure along the Guang-fo line.Analysis found that:for vertical vibration, with the increase of the number of floors, vibration intensity increased to different extent. But there is no the same change rule for horizontal direction.(3) Based on the measured data, a simple calculation method of structural response is put forward. A fine element model of a structure on a rigid foundation is established. The measured ground vibration acceleration is input as the excitation to calculate the vibration response of the building floor. Comparing simulation results with measured results, it finds that both are consistent.(4)Based on structure mode established by the finite element analysis software MIDAS/GEN, we study the effect of vertical vibration by changing building structural features. The conclusions provide a reference for the design of the ground buildings vibration and isolation.