Study on Cumulative Damage Characteristics of TCC Composite Model Specimen under Bending Fatigue Loading

被引：0
|
作者：
Xu G. [1 ]
Ren X. [1 ]
Wang Q. [1 ]
Zhang Z. [1 ]
Wu A. [1 ]
机构：
[1] Guizhou Institute of Technology, Guiyang
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2021年 / 43卷 / 03期
关键词：
Ballastless track structure; Cumulative damage; TCC composite model specimen;
D O I：
10.3969/j.issn.1001-8360.2021.03.018
中图分类号：
学科分类号：
摘要：
Based on the CRTSⅡ slab ballastless track structure, the track slab-CA mortar-supporting layer concrete composite (TCC) specimens (100 mm×100 mm×400mm) were cast. Upon the application of the bending fatigue load by the MTS universal servo hydraulic fatigue tester, the bending fatigue deformation characteristics and cumulative damage evolution process of composite model specimen were studied using 4-point bending test method when the stress level S was 75%, 85% and 95%. The results of the study show that: compared with ordinary concrete, only one main crack appears in the composite model during its failure, which separates the specimen completely. Horizontal cracks appear at the bond between the layers, and the failure of the TCC specimens shows significant ductile failure characteristics. The TCC bending fatigue life can be expressed by the single logarithmic linear relation of S-N curve. Based on the theory of material mechanics, the method of transforming the displacement-load data measured by the experiment to the stress-strain curve was studied and the formula for calculating the dynamic elastic modulus of bending fatigue was deduced. Based on the three-stage fatigue strain analysis, the bending fatigue test data, the calculation formula of dynamic elastic modulus as well as the fatigue life of the linear regression equation, the fatigue cumulative damage evolution equation of the composite model specimen based on the test result was proposed. © 2021, Department of Journal of the China Railway Society. All right reserved.
引用
收藏
页码：142 / 148
页数：6
相关论文
共 27 条
  • [1] ZHAI Wanming, ZHAO Chunfa, XIA He, Et al., Basic Scientific Issues on Dynamic Performance Evolution of the High-speed Railway Infrastructure and Its Service Safety, Scientia Sinica (Technologica), 44, 7, pp. 645-660, (2014)
  • [2] TAKAHASHI T, SEKINE E., Evaluation of Factors Contributing to Deterioration of Track-slab in Cold Areas, Quarterly Report of RTRI, 52, 3, pp. 149-155, (2011)
  • [3] ZHU Shengyang, CAI Chengbiao, Research on the Damage Characteristics of Double-block Ballastless Track Bed Slab under Temperature and Vehicle Dynamic Loads, China Railway Science, 33, 1, pp. 6-12, (2012)
  • [4] (2014)
  • [5] ZHU S Y, CAI C B., Fatigue Life Prediction of CRTS I Ballastless Slab Track, Third International Conference on Transportation Engineering (ICTE), pp. 1714-1719, (2011)
  • [6] ZHU S Y, FU Q, CAI C B, Et al., Damage Evolution and Dynamic Response of Cement Asphalt Mortar Layer of Slab Track under Vehicle Dynamic Load, Science China Technological Sciences, 57, 10, pp. 1883-1894, (2014)
  • [7] (2015)
  • [8] (2013)
  • [9] MINER M A., Cumulative Damage in Fatigue, Journal of Applied Mechanics, 12, pp. 159-164, (1945)
  • [10] (2012)
123