Research On The Law Of Braking Force Of CWR Train On Beam Bridge

Rapid development of high speed railway in the world,the progress of the society decide the development direction of high speed,overloading,and seamless line construction is one of the most critical railway technology,one of the bridge are seamless has generally been considered the current high-speed railway engineering construction in China is mainly to solve technical problems,the relevant entity model,the calculation theory of entity and its research methodology,also need to continue to experience long-term development to gradually improve.In the design of bridge pier,the load is a very important part,and the train braking force is the key content of the load,and it is also one of the main reasons that makes the rail produce longitudinal additional force.In the design of bridge seamless track in foreign countries,more attention is paid to the calculation of braking force,and a relatively perfect theoretical system has been formed,such as the length,size and checking rules of train load.In recent years,China gradually began to pay attention to the basic measurement and control calculation of braking force.From the basic point of view of measuring the maximum braking force of pier rail controlled by additional longitudinal force,the calculation limits of the minimum longitudinal braking force of pier top and horizontal braking stiffness were put forward,and the corresponding norms were formulated.Based on the systematic synthesis of a large number of basic theoretical research and practical test results at home and abroad,this paper mainly studies the following contents:(1)Combined with the basic dynamic principle of the interaction between beam and rail on the bridge and the finite element method,the braking force and the dynamic calculation of expansion force are analyzed theoretically.(2)The mechanical calculation model of beam-rail interaction is established.Combined with ANSYS,a software of finite element interaction in three-dimensional space structure theory,a theoretical model of nonlinear finite element interaction of "line,bridge and pier integration" in three-dimensional space is established.(3)using the PYTHON language and finite element software ANSYS to calculate the combination of programs,run the program to solve different type on railway bridge braking under different braking envelope,comparative analysis,further get additional braking force distribution,the maximum displacement of beam and rail,and then clarify the most unfavorable loading condition.(4)calculate the expansion force on the different types of girder bridge,the expansion force and distribution law of each section point on the seamless line,the displacement chart of the beam and rail,the longitudinal horizontal force borne by each pier,the analysis of the results,the analytical results of the brake additional force and expansion force are compared and analyzed,and then clarify a certain conclusion.