Vibration Response Analysis Of Sites Along Urban Rail Line

Urban rail transit(URT)is a transportation mode with large capacity,environmental protection,energy saving and high punctuality.Many densely populated cities are vigorously developing urban rail transit construction and extending its line length.While rail transit brings convenience to people's travel,the operation of trains also causes some troubles to the lives of the residents around the railway,especially to some vibration-sensitive teaching,scientific research and medical units.Based on the monitoring data of a section of Beijing Metro Line 13,the three-dimensional finite element simulation model is established by using ABAQUS finite element analysis software.Considering various influencing factors such as train,track,roadbed and foundation,the vibration effect is analyzed,and the vibration is reduced by appropriate ways.The research contents mainly include the following aspects:(1)In the process of finite element modeling,the setting of boundary conditions is extremely important.In order to prevent energy reflection into the finite element model and affect the accuracy of the model,the infinite element boundary conditions are adopted in the simulation process in this paper.(2)The engineering on which this paper relies is briefly summarized,and a set of monitoring data is fitted according to empirical formula.The dynamic load between wheel and rail is controlled by many factors.The excitation between train and rail can be divided into deterministic excitation and stochastic excitation.For track irregularity,Germany,Britain,the United States and China have formulated different calculation formulas.Finally,according to the train parameters of Beijing Metro Line 13,the time history of dynamic loads between wheels and rails is obtained by self-programming.(3)According to the site conditions of a section of Beijing Metro Line 13,the finite element analysis model is established by using ABAQUS finite element analysis software,and loads are applied on the track.The vibration response data of the finite element model and monitoring data are compared and analyzed.Then,the effect of hard shell on site vibration is studied.