Fatigue reliability analysis of RC beams in heavy-haul railways based on direct probability integral method

被引：0
|
作者：
Gao T. [1 ]
Li Z. [1 ]
Zhang J. [1 ]
Song L. [2 ,3 ]
Cui C. [2 ]
Yu Z. [2 ,3 ]
机构：
[1] Shuohuang Railway Development Co., Ltd., Suning
[2] School of Civil Engineering, Central South University, Changsha
[3] National Engineering Research Center of High-speed Railway Construction Technology, Changsha
来源：
Journal of Railway Science and Engineering | 2023年 / 20卷 / 04期
关键词：
direct probability integral method; equivalent stress range; failure probability; fatigue reliability; heavy-haul railway; reinforced concrete beam;
D O I：
10.19713/j.cnki.43-1423/u.T20220809
中图分类号：
学科分类号：
摘要：
The increase in axle load of operating trains on existing heavy-haul railway lines leads to more serious fatigue problems of reinforced concrete (RC) beams, which seriously affects the service performance of bridges. The objective of this researchwas to study the fatigue reliability of RC beams in heavy-haul railways and to ensure the service safety of heavy-haul railway bridges from the perspective of probability. According to the operation characteristics of heavy-haul railways, the fatigue performance function of RC beams in heavy-haul railways was established, and the fatigue reliability analysis method of heavy-haul railway bridges was proposedbased on the direct probability integral method (DPIM). By taking an 8 m-span simply supportedRC plate beam of an existing heavy-haul railway as an example, the load models of freight trains with different axle loads of the heavy-haul railway were analyzed. The train axle weight and dynamic coefficient were taken as random variables, and the probability model of reinforcement equivalent stress range was obtained through the moving load method and rain flow counting method. On this basis, combined with the equivalent operation spectrum of heavy-haul railway, the fatigue reliability of the 8 m-span RC plate beam was evaluated, and the effects of annual traffic volume and train axle weight on fatigue reliability were discussed. The results indicate that the DPIM can evaluate the fatigue reliability of RC beams in heavy-haul railways efficiently and accurately. In the first 20 years of operation of this heavy-haul railway line, the fatigue failure probability is lower than the limit specified in the design code. With the increase in the annual traffic volume of the heavy-haul railway, the fatigue failure probability of the RC plate beam increases significantly. The increase of train axle weight from 23 t to 25 t has a slight effect on the fatigue reliability of RC plate beams. The operation of 30 t axle weight trains wouldseriously reduce the fatigue reliability of RC beams, so it is necessary to strengthen the maintenance of heavy-haul railway bridges. The research findings can provide a basis for the design and maintenance of RC bridges in heavy-haul railways. © 2023, Central South University Press. All rights reserved.
引用
收藏
页码：1416 / 1424
页数：8
相关论文
共 32 条
  • [1] SONG Li, CUI Chenxing, LIU Jinliang, Et al., Corrosionfatigue life assessment of RC plate girder in heavy-haul railway under combined carbonation and train loads, International Journal of Fatigue, 151, (2021)
  • [2] YU Zhiwu, LI Jinzhou, SONG Li, Experimental study on post-cyclic-loading residual static bearing capacity of heavy-haul railway bridges, Journal of the China Railway Society, 36, 4, pp. 76-85, (2014)
  • [3] SONG Li, HOU Jian, YU Zhiwu, Fatigue and postfatigue monotonic behaviour of partially prestressed concrete beams, Magazine of Concrete Research, 68, 3, pp. 109-117, (2016)
  • [4] ZUO Jiaqiang, Influence of running 20, 000-ton heavy-haul trains on the superstructure of existing bridges on Daqin Railway, Railway Standard Design, 50, 1, pp. 43-44, (2006)
  • [5] GAO Xun, NIU Bin, Research and application of heavy load reconstruction technology for existing railway bridges, Railway Engineering, 51, 11, pp. 1-4, (2011)
  • [6] LI Jinzhou, YU Zhiwu, Study on the effect of fatigue in 32 m PC simply supported T-type beams on existing line due to heavy-haul transport, Railway Standard Design, 58, 10, pp. 56-61, (2014)
  • [7] LU Zhaohui, MA Yifei, YU Zhiwu, Et al., The adaptability study on the operation of heavy-haul trains on existing railway bridges, Journal of Railway Science and Engineering, 13, 7, pp. 1294-1302, (2016)
  • [8] LUO Huigang, Adaptability analysis and experimental study on the static and dynamic performance of 12 m reinforced concrete T-beams of heavy haul railway, Railway Standard Design, 63, 3, pp. 90-95, (2019)
  • [9] HU Suoting, NIU Bin, KE Zaitian, Adaptability analysis of existing railway bridges and culverts in China to large axle heavy freight cars, Railway Engineering, 53, 3, pp. 1-4, (2013)
  • [10] YU Zhiwu, SHAN Zhi, YUAN Ju, Et al., Performance deterioration of heavy-haul railway bridges under fatigue loading monitored by a multisensor system, Journal of Sensors, 2018, (2018)
1234