Dynamic Response And Fatigue Analysis Of Sound Barrier Under Train Induced Wind And Natural Wind

High-speed railway sound barrier is one of the main facilities to solve the problem of noise pollution along the railway,which is widely used in practical engineering.However,in the service environment,the sound barrier structure will be repeatedly impacted by the train fluctuating wind and excited by the natural wind load,which is likely to cause structural instability or fatigue failure.Especially for the semi enclosed sound barrier structure,its sealing property is stronger,the stress area is larger,and the dynamic response under wind load will be more significant.Therefore,it is very necessary to study the structural safety and stability of semi closed sound barrier under wind load.Based on the general project of National Natural Science Foundation of China(51878672)-" Research on the theory and method of optimization design of sound barrier structure of high-speed railway under aerodynamic load",this thesis analyzes and discusses the dynamic response law and fatigue performance of semi enclosed sound barrier under train wind and natural wind.The main research work includes:(1)Based on computational fluid dynamics(CFD),the finite element model of semi closed sound barrier structure and the model of high-speed train are established.The process of train passing through the sound barrier is simulated,and the reliability of the simulation method is verified combined with the measured data.(2)Established aerodynamic analysis models of different forms of semi-enclosed sound barrier structures,and analyzed the surface of semienclosed sound barriers under the action of train pulsating wind under the conditions of single-vehicle passing and passing vehicles with vehicle speed as a variable.The magnitude and distribution of wind pressure.(3)Based on the dynamic theory,through the large-scale finite element analysis software ANSYS,using the Workbench as the working platform,and using the transient dynamic analysis module,the modal analysis of the semi-closed sound barrier structure with various structural forms is carried out,and the research is carried out.(4)The natural wind is simulated and verified by AR linear filtering method.Using the fluid structure coupling theory,taking the train fluctuating wind pressure and natural wind pressure on the surface of the sound barrier as the external load,the dynamic response of various forms of semi closed sound barrier structure is solved,and the physical quantities such as equivalent stress and deformation of the sound barrier structure are analyzed.(5)According to the results of dynamic analysis and the linear fatigue damage accumulation theory,the H-shaped steel column of the sound barrier is selected as the research object,the equivalent stress time history curve is counted by the rain flow counting method programmed by MATLAB,and the fatigue life of the sound barrier is calculated.There are 59 figures,12 tables and 80 references.