# Wind Load Characteristics of Wind Barriers Induced by High-Speed Trains Based on Field Measurements
## 5 Conclusions  
Field measurements were conducted on the Nanning-Guangzhou high-speed railway in order to obtain the high-speed train-induced wind pressure data for wind barriers installed on the Xijiang Bridge. The speed of the CRH380A EMU high-speed train was in the range of 200 km/h-280 km/h. A DTC net electronic type pressure scanning system was used in field measurements. The measured time history curves of fluctuating pressure were analyzed by the wavelet transform signal processing method in order to identify the pressure distribution in different frequency bands. Results showed that the wind pressure on wind barriers caused by train-induced wind had two significant impacts  
Figure 11: Comparison of extreme pressures of different decomposition layers under different running speeds.  
Figure 12: The power spectrum of wind pressure at test point 9.  
Figure 13: Percentage of low-frequency energy in total energy.  
with opposite directions, which were the \"head wave\" and \"tail wave\". Similar results can be found in previous research regarding scale model studies, numerical investigations, and full-scale tests. The peak wind pressure on the wind barrier was approximately proportional to the square of the running speed, and it rapidly decreased with height. The maximum wind pressure occurred at the rail surface height. Furthermore, the fluctuating wind pressure energy on the surface of the wind barrier was mainly distributed in the low-frequency range of 0-2.44 Hz, which accounted for 94% of total energy. This indicates that the low-frequency range component of the wind pressure dominates the design of the wind barrier. Since the fundamental frequency of a barrier turned out to be less than 3.0 Hz, the cyclic loads acting on the barriers due to the repeated passage of high-speed trains will lead to the fatigue of barriers. Therefore, the effects of the aerodynamic pressure generated by high-speed trains on the vibration of barriers is a topic worthy of attention. In addition, the running speed of the train did not change the distribution of the wind pressure component of the wind barrier in the frequency domain. While the wind pressure extreme value was slightly increased with the increase in the train's speed.  
All the authors made significant contributions to the work. [PERSON], [PERSON], [PERSON], and [PERSON] conceived this study; [PERSON], [PERSON], and [PERSON] completed the tests and analyzed the data; [PERSON], [PERSON], and [PERSON] provided advice for the preparation and revision of the paper; [PERSON], [PERSON], [PERSON], and [PERSON] wrote the paper; [PERSON] and [PERSON] reviewed the manuscript for scientific contents.  
The authors gratefully acknowledge the support of the National Key R&D Program of China (Project No. 2017 YFB1201204), and National Natural Science Foundations of China (Project Nos. 51508580, U1534206 and 51708202). The work presented in this paper was also supported by grants received from the Natural Science Foundations of Hunan Province (Project No. 2016)J3149).  
The authors declare no conflicts of interest.