Study on Aerodynamic Load Characteristics of Deloading Sound Barrier of High-speed Railway

Deloading sound barrier is one of the effective ways to improve the high-speed railway sound barrier structure safety and reliability. Its aerodynamic load characteristics are the key to reflect the overall force of the sound barrier. Therefore, studying on the high-speed railway deloading sound characteristics has an important significance. The aerodynamic load characteristics of deloading sound barriers in bridge section and subgrade section were studied experimentally from three aspects: EMU speeds, upbound and downbound EMU trains, and influence of EMU types. As the results show, for the bridge section, the positive stress amplitude of the deloading sound barrier is about twice the negative stress amplitude. The closer the train is to the sound barrier, the more sensitive the aerodynamic load on the sound barrier is to the speed. The aerodynamic load of CRH380A on the sound barrier is greater than that of CRH380AM at the same speed. The effects of EMU types on the aerodynamic load of the sound barrier are little affected by the EMU speeds. For the subgrade section, at the same speed, when the EMU train passes through the subgrade section, the stress amplitude of the sound barrier is greater than that of the bridge section. With the increase of EMU speeds, the increase of positive stress amplitude is much smaller than that of negative stress amplitude. The characteristics of the deloading sound barrier when upbound and downbound trains pass through the barrier are highly correlated with the heights of sound barriers. The changes of aerodynamic loads on the sound barrier with EMU speeds have little relationship with the distance between EMU and the sound barrier. At less than 320 km/h of the EMU speed, the increasing trend of the difference between the stress peak and valley value with the increase of the EMU speed is slow. © 2020, Department of Journal of the China Railway Society. All right reserved.