Study On Response Characteristics Of Building Vibrations Induced By Subway

The subway is an important part of urban rail transit. In recent years, it hasbecome the trend of the development of the city. It is a effective way to solve urbantraffic congestion, save energy and reduce pollution. And the environment vibrationinduced by subway is the problem must to be solved urgently. By consulting a largenumber of international documents, this paper elaborated the effects of subwayvibration to the surrounding environment, summarized its current research status onvibration source characteristics and reduction measures, vibration propagation law inthe soil, response properties of building vibrations. Then put forward the problems tobe improved and the research content of this paper: the subway environment groundvibration test, the analysis of building vibration, multiple-support excitation vibrationanalysis of large layout building.The ground vibration on the range from Olympic park to Olympic sports center ofBeijing subway line8is measured. Vibration data processing, analysis and evaluationmethods are summarized. The test data in time domain and frequency domain areanalyzed and each measuring point vibration characteristics are compared. Investigatethe propagation attenuation law of ground vibration induced by subway in threedirections. And the test data can be the input excitation of building vibration analysis.The building vibration analysis methods are confirmed. Various structural modelsare simulative calculated. By changing the structure parameters of the models andcomparing calculation results, the response characteristics of building vibration andthe various parameters change’s influence on the characteristics are summarized.Main investigated parameters include: total number of layer, story height, slab span,beam section, column section, slab thickness, construction materials.The methods of multiple-support excitation vibration analysis are summarized.Large layout building that long span perpendicular to track and large layout buildingthat long span parallel to track are analyzed by multiple-support excitation.Investigate the response characteristics of large layout building vibration bymultiple-support excitation. Large layout buildings are also analyzed bysimple-support excitation. Then, compare the result of multiple-support excitation and simple-support excitation. Investigate the difference of response characteristics oflarge layout building vibration between multiple-support excitation andsimple-support excitation.Finally some conclusions are drawn from above research results. With variousstructural parameters change, the change rules of structure components vibrationcharacteristics are complex. The vibration of the concrete structure is partial to lowfrequency and high frequency vibration decay more quickly in the concrete structure.The vertical vibration intensity of steel column and steel beam is stronger than theconcrete structure. Large layout building that long span perpendicular to track, withthe increase of distance to the rail, the floor vertical vibration intensity decreases. Aslayers increases, the influence of distance to the rail on the floor vertical vibrationintensity is smaller. Large layout building that long span parallel to track, the verticalvibration intensity of middle floor slab is stronger than the end floor slab, but thedifference is not obvious. The vertical vibration intensity of simple-support excitationis stronger than multiple-support excitation. Simple-support excitation will weakenthe horizontal high frequency vibration and strengthen the horizontal low frequencyvibration.