Predicting Proposed Buildings Vibrations Induced By Trains

Due to rapid development of transportation lines and more and more railways come cross or come close to center of cities, it is became to be more severe that the influence of vibration by transit of trains on the comfort of people living inside the buildings and the applicability of precise instrument and so on. So the government and many researchers have thought much of it.Recently, many researchers focus on the ground-vibration near a line and the model of ground-borne vibrations induced by trains. In fact, it is important to know the influence of proposed buildings stringently. Therefore, this paper focuses on predicting the vibration of proposed buildings by measuring the field in the vicinity of a line. So we can estimate the building vibrations, and change design in time or take other measures to reduce influence.As regard the plane shape of proposed buildings, one transducer is fixed in the center of field, the train-induced ground vibrations in one day are recorded. The method is validated by the data measured in an existing building. In this paper, we use the recorded data and take two methods to predict the proposed building vibrations. Because of differences of ground vibrations before and after construction of the building, there is uncertainty in the prediction. Methods are employed to deal with this problem. The input data is considered as fuzzy numbers and the methods based on mono-source fuzzy number is used to compute the response of structure. So fuzzy vibration level can be obtained. Another method is that use average acceleration power spectrum to predict.Comparing to code's method, the two methods can reduce computing time. Further more, there is another advantage that we can gain interval of vibration rate.