Concrete Guardrail's Dynamic Response Under Impact Of Maglev Train

Since the 1960s when Germany started to study magnetic levitation traffic,maglev technology has drawn great attention and popularity.Compared to rail and subway systems,maglev trains are competitive on a 100-1600 km route.With the continuous development of magnetic levitation technology,the performance of all aspects of the maglev train is constantly optimized and the speed is constantly increasing.Maglev train gradually accelerated into the pace of people's lives.However,the research on the structure of guardrail in the current maglev train engineering is very scarce,and the real car experiment is almost zero.For an ultra-high-speed maglev train in the event of an emergency,it will result in major accidents and serious consequences.In order to ensure the safety of such lifeline engineering of the maglev train,it is necessary to predict and analyze the train collision and derailment situation so as to evaluate the performance of the train protective structure and take necessary engineering measures to reduce the harm caused by the accident.Taking into account the extremely expensive cost of real-vehicle experiments,the use of computer technology for magnetic levitation train dynamic response analysis becomes a good tool.Based on the actual project of the maglev train in the Central Tokyo-Nagoya section of the Tokyo-Nagoya line,this paper analyzes the protective effect of the maglev train guardrail using ANSYS/LS-DYNA dynamic finite element software and simulates the derailment of the maglev train.As a result,this paper carried out the following aspects of research work:(1)Based on the numerical analysis of ANSYS/LS-DYNA and the basic principles of collision dynamics,a finite element model of the guardrail of the maglev train is established.(2)The process of derailment and impact on guardrail is simulated to research the failure form and dynamic response of concrete guardrail after collision.(3)Adjust the collision angle between the train and the barricade,the collision area,the location of the collision point and other parameters to simulate the impact process and identify the unfavorable conditions so as to analyze and evaluate the protective effect of the guardrail and provide reference for the improvement.(4)After adjusting the parameters such as the size and strength of the concrete guardrail,the process of impacting the guardrail with the train is simulated and the results are compared and analyzed to optimize the design of the concrete guardrail.Through the above work,the dynamic response of the collision between the train and the concrete guardrail has been studied,and the concrete guardrail has been further recognized in the aspects of internal forces and energy after the collision.The research results can provide reference for train and guardrail shape design,guardrail material selection and so on.At the same time,combining the results of simulation analysis,some suggestions for improvement are put forward to take some measures to reduce the loss of train accidents and reduce the damage during the collision of guardrail.