Study On Prediction Of Metro Train-Induced Building Vibration

With a huge number of city track traffics being built, the vibration caused by metro operation systems have more and more influence on the surrounding environment. People pay more attention to the severe problem of ambient vibration caused by metro operation.This article puts forward the vibration frequency transfer method to predict the vibration to the proposed building. Combining masonry buildings along the metro lines and planned museum project, it uses the field measurement and numerical simulation method to study the vibration prediction of the nearby buildings caused by the subway. It mainly contains the following several aspects:(1) Measure the masonry buildings near along the metro lines, and use ANSYS to establish the whole model of masonry buildings, analyzing the vertical vibration in single frequency response under simple harmonic excitation. Study the transfer function of the "building floor-the upper structure". Measured and simulated data shows that the structure under vertical resonance wave in low frequency, acceleration amplitude increase with the increasing of floors, but decrease with the increasing of floor acceleration amplitude under the action of high frequency wave.(2) Use the vibration frequency transfer method to get the vibration response on the every building floor under the influence by the subway and process and analyze the relative test data. The result finds that the vibration frequency transfer method that was newly put forward can forecast the structure response under the influence by the subway.(3) Make the field test on the building quake react under the subway vibration, and get the test the quake speed up response. The test data tells us the higher floors, the greater the vibration amplitude of Z level. The percentage of the30-50Hz vibration energy induced by underground trains is becoming less and less, while the percentage of the structure self vibration lower frequency of5-16Hz is becoming bigger and bigger.(4) Build finite element model "Basement-Superstructure" of the planned museum in ANSYS. Analyze its response under vertical vibration simple harmonic excitation. Study the influence of the quake when the subway working by the transfer method. Evaluate the result of the finite element analysis, combined with the relevant vibration standard. It turns out the planned Museum can reach some relative standards of our country under the influence of the subway.