Train Induced Vibration Analysis Of Structures Adjacent To High Speed Railway Station

As the important part of railway station,structures adjacent to lines are sensitive to the train induced load on account of its lightsome structure design and position relatively close to lines. A large number of measured data shows that overline bridge structures and canopy structures generate a big vibration response by train induced wind pressure and the train induced vibration affects the passenger comfortability causes security risk of overline structures.However scholars at home and aborad pay more attention to the train induced wind load than train induced vibration. So it’s very essential to study the fluctuating part of wind pressure and delve to the train induced vibration of overline bridge structures and canopy structures.This paper does a case study of strcutures adjacent to lines of multiple parameters in order to give some suggestions to the pratical design work in consideration of train induced vibration.The main contents is as followed:(1) This paper adopts the computational fluid dynamic numerical simulation software FLUENT.using large eddy simulation turbulent model to build the wind field model of structures adjacent to railway station while high speed train passing by and acquire transient wind pressure of this three-dimensional, unsteady, compressible flow field,which is achieved agreeable to the measured value.And we compare the trainsient wind with the mean wind obtained by Reynolds average turbulent model, analyzing the features of fluctuating wind in time domain, frequency domain, extremum in space and energy distribution so as to give some reference to the fluctuating wind analysis.(2) Based on the method of load partition, mean wind pressure and fluctuating wind pressure are input into the ANSYS overline bridge model for discussing the influence of fluctuating wind pressure to the train induced vibration results.Otherwise, FLUENT pressure and code pressure are respectively input into ANSYS model fully validated by measured data to discuss the issues of current code for design of high speed railway.(3) Based on finite element parametric modeling method in APDL programming language in ANSYS software, the train induced vibration of various types of structures adjacent to lines was dicussed using the method of load partition.To quote as a precedent, we study the vibration of large-span bridges and rainsheds,analyze the spatial distribution of the vibration extremum results and vibration time history.Through the analysis above,we provide a reference for response of structures adjacent to high speed railway station while taking train induced vibration into consideration in design.