Aerodynamic Load Simulation And Structural Loading Analysis Of High-speed Railway Deloading Noise Barrier

With the rapid development of China’s railway construction, the increase of the train speed, causing more serious noise pollution to the surrounding environment. In order to build environment-friendly railway, the construction of noise barrier is a common measure to reduce railway noise and protect the living environment of the residents. The fluctuating wind pressure caused by the high-speed trains will do adverse effects on the safety and reliability of noise barrier, with the increase of the train speed, noise barrier design engineer need to consider noise reduction capability, safety, stability and economy, appearance, etc. a series of more and more stringent requirements. Deloading noise barrier has opening structure compared to traditional noise barrier, air can flow through the opening structure of deloading noise barrier, therefore the aerodynamic load upon the noise barrier decreases. V-type deloading noise barrier has been put into use in the joint commissioning section of Datong-Xi’an high-speed railway.Analysis the time and spatial distribution characteristics of aerodynamic load upon the V-type deloading noise barrier caused by high-speed train, on this basis, carry on the structural loading analysis of V-type deloading noise barrier, evaluate the deloading effect of V-type deloading noise barrier compared to traditional noise barrier have important significance.Firstly, with V-type deloading noise barrier and traditional noise barrier for the study, establish the noise barrier model, carry on numerical simulation of high-speed train passing through the noise barrier using CFD software Fluent, the time and spatial distribution characteristics of aerodynamic load upon two types noise barrier caused by high-speed train are obtained by simulation analysis. Compare and analysis the difference of the flow field around the two types of noise barrier and the difference of the fluctuating pressure, two types of noise barrier overall resultant force and moment and deloading ratios, every unit board resultant force and deloading ratios, at different times the train passing through the noise barrier. The simulation results are verified by the Datong-Xi’an deloading noise barrier experimental data.Secondly, establish structure analysis model of two types of noise barrier by FEA software ANSYS, import aerodynamic load obtained in the first step, carry on the structural loading analysis. Compare and analysis the stress and strain distribution of columns from two type’s noise barrier, compare the difference between root strain differences of columns from two type’s noise barrier, evaluate the deloading effect of V-type deloading noise barrier. The simulation results are also verified by the Datong-Xi’an deloading noise barrier experimental data.