Time-dependent Fatigue Reliability Analysis of CRTS Ⅱ Foundation Plate on Bridge

被引：0
|
作者：
Lu H. [1 ]
Zhang X. [1 ]
Zhao Y. [1 ,2 ]
机构：
[1] College of Arehiteeture and Civil Engineering, Beijing University of Teehnology, Beijing
[2] Faculty of Engineering, Kanagawa University, Yokohama
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2023年 / 45卷 / 05期
关键词：
CRTS II foundation plate; fatigue failure mode; limit state function; sensitivity analysis; time-dependent reliability;
D O I：
10.3969/j.issn.1001-8360.2023.05.012
中图分类号：
学科分类号：
摘要：
The time-dependent fatigue reliability of China Railway Track System II ( CRTS II) foundation plate on bridge under the combined actions of train load, temperature and bridge deformation was analyzed. Firstly, the structural response of the foundation plate was discussed considering the effects of train load, temperature gradient and bridge deformation. Secondly, based on the fatigue performance of concrete bending and compression and steel bending, the time-dependent fatigue limit state function was established. To analyze the statistical characteristics of concrete fatigue strength, temperature gradient, bridge deformation curvature, fatigue modulus of elasticity of concrete, model uncertainty coefficient and bending moment generated by train load. The PHI2 method was used to carry out the time-dependent reliability analysis of the foundation plate, and the results were compared with those using the traditional point-in-time method. Finally, the sensitivity of the time-dependent fatigue reliability of the foundation plate to train load, temperature gradient and bridge deformation curvature was discussed. The results show that during the service life of CRTS II foundation plate, the time-dependent fatigue reliability indices of the concrete bending compression and the steel bending tension meet the requirement of China's standard. The relatively larger reliability index obtained by traditional point-in-time method than that obtained using PHI2 method, may bring potential hazards to the operation of the whole track system. The change of the mean value of bridge deformation curvature has the greatest influence on the fatigue reliability with relatively less influence of train load and little influence of temperature gradient The influence of the mean values of above-mentioned load parameters on reliability is greater than the coefficient of variance. The research results can help to determine the time for the maintenance of CRTS II foundation plate and provide a theoretical reference for the operation and maintenance of high-speed railway structures. © 2023 Science Press. All rights reserved.
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页码：103 / 112
页数：9
相关论文
共 34 条
  • [1] WU Bin, CHEN Wenrong, LIU Can, Et al., Experimental Study on Mechanical Characteristics of CRTS II Slab Track under the Vertical Load of Train, Journal of Railway Science and Engineering, 11, 3, pp. 37-42, (2014)
  • [2] YU Zhiwu, Study on Time-dependent Behavior of Ballastless Track-bridge Structure System of High-speed Railway [R], (2016)
  • [3] WANG Qing, WEI Jun, DONG Rongzhen, Et al., Fatigue Behavior Analysis of CRTS II Slab Ballastless Track Structure [J], Journal of Railway Engineering Society, 31, 5, pp. 41-47, (2014)
  • [4] XU Qingyuan, ZHANG Ze, CHEN Xiaoping, Et al., Experimental Study on Fatigue Life Prediction Model of Concrete of CRTS II Slab Track on Bridge, Journal of Railway Science and Engineering, 14, 8, pp. 1565-1570, (2017)
  • [5] XU Qingyuan, DUAN Jun, XIAO Zucai, Et al., Research on Probabilistic S-N Curve of HRB500 Reinforcing Bar of Longitudinal Connected Slab Track on Bridge [J], Journal of Hunan University (Natural Sciences), 45, 3, pp. 110-114, (2018)
  • [6] XU Qingyuan, LIN Qingteng, FANG Ziyun, Et al., Fatigue Characteristics of Longitudinally Connected Slab Ballastless Track on Bridge under Combined Load, China Railway Science, 38, 6, pp. 37-46, (2017)
  • [7] TENG Dongyu, Research on the Durability of Foundation Plate in Continuous-slab-track on Bridge [D], (2009)
  • [8] OU Zumin, Fatigue Reliability Analysis Methods and Application for Slab Track Structure [D], (2016)
  • [9] YU Zhwu, MAO Jianfeng, TAN Su, Et al., The Sochastic A-nalysis of he Track-bridge Vertical Couped Vibration with Random Train Parameters, Journal of he Chna Railway Society, 37, 1, pp. 97-104, (2015)
  • [10] ANDRIEU-RENAUD C, SUDRET B, LEMAIRE M., The PHI2 Method: a Way o Compue Time-varian Reliablity, Reliablity Engineering & System Safety, 84, 1, pp. 75-86, (2004)
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