Study on Design Control Parameters of Static Long-wave Irregularity of Long-span High-speed Railway Bridge Track

In the current design and acceptance standards for high-speed railways in China, the 300 m baseline and 150 m external distance difference method are used for the long-wave irregularity evaluation of the tracks of high-speed railways (HSR) in China. However, such evaluation methods are inadaptable to the inherent deformation characteristics of long-span bridges, with the dynamic changes of the track alignment with temperature variation and concrete shrinkage and creep. The 60 m midpoint chord measurement method was determined to evaluate the long-wave irregularity of long-span bridge track, via the sensitive wavelength analysis of current high-speed trains in China, coupled with monitoring results during operation period of several long-span HSR bridges and the effective measurement range of different chord lengths. By simulation and measurement methods, the regularity control limits at 250 km/h, 300 km/h, and 350 km/h by the 60 m midpoint chord measurement method were obtained. The engineering practice of multiple long-span bridges shows that the 60 m midpoint chord measurement method, with good applicability, can be referred to in the future design and acceptance of long-span HSR bridges. © 2024 Science Press. All rights reserved.