| China is a country with frequent earthquakes,in particular,there have been many major earthquakes of magnitude 7.0 or higher in the past 40 years.After the earthquake,rescue workers and medical personnel are urgently needed to enter the disaster area.At the same time,a large number of food,tents and medical equipment are needed.After the earthquake,railway transportation will often be ineffective,affecting relevant personnel and urgently needed materials to enter the scene,delaying rescue work.This paper studies the impact of bridge deformation on railway traffic safety under earthquake action,and it is of great significance for future rescue and disaster relief and guarantee the timely recovery of transportation capacity after railway transportation.The main research work is as follows:(1)This paper summarizes the current research methods of seismic response,summarizes the research status of vehicle-bridge coupling model and summarizes the research on the impact of additional deformation of bridge structure on railway driving safety.(2)Based on the finite element software ANSYS,a simply supported beam bridge model that considering the CRTSI-type ballastless track and pile-soil effect is established.The effect of the lateral seismic response is analyzed by the nonlinear time-history analysis method.under different bridge the ballastless lateral stiffness,different pier heights and different PGA.(3)Explain the vehicle dynamics model,establish the force model and the vehicle motion equation,and generate the German high-speed low disturbance line by using the trigonometric series method;(4)Based on the multi-body dynamics software SIMPACK,a space vehicle model that solve the wheel-rail contact geometry by the trace method,and solve the wheel-rail force with the normal Hertz elastic contact theory and the tangential Kalker linear creep theory is established.(5)Determined the vehicle dynamic performance index.The system excitation including the lateral deformation of the beam and the German high-speed low disturbance line.Study the changes of vehicle dynamic performance indicators under different peak accelerations and different train speeds,and obtain the traffic safety threshold. |
