INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Dynamic Performance and Evaluation Method of High-speed Railway Ballastless Track Concrete |
WEN Jiaxin1,2, LI Huajian1,*, YANG Zhiqiang1, LI Zichun2, HUANG Fali1, WANG Zhen1, YI Zhanglai1, XIE Yongjiang1
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1 Railway Engineering Research Institute,China Academy of Railway Science Corporation Limited,Beijing 100081,China 2 Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China |
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Abstract Ballastless track concrete structure is the key position for bearing the dynamic loads induced by high-speed running train.With the continuous effects of periodic dynamic loads,internal damage occurs and service performances of ballastless track structure are decreased,leading to the durability issue of ballastless track and insecurity risk of the running train.According to the service characteristics of ballastless track concrete,high-frequency fatigue loads are the main types of dynamic loads under normal service state,however,impact loads cannot be ignored when the track is irregular.This paper summarizes the characteristics of dynamic loads,and then illustrates the requirements for both fatigue and impact performances of ballastless track concrete.Meanwhile,the applicability and limitations of the dynamic performance evaluation method of ballastless track are further elaborated,aiming to provide certain suggestions and directions for the evaluation of service performances and long service life design of ballastless track.
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Published: 25 October 2023
Online: 2023-10-19
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Fund:National Natural Science Foundation of China (High-Speed Railway Joint Foundation) (U1934206) and National Natural Science Foundation of China (52178260). |
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