[1] Xue Yanqing, Huang XiaomingQian Shunzhi, Ma TaoZou Xiangheng,. Fatigue reliability quantitative analysis of cement concretefor highway pavement under high stress ratio [J]. Journal of Southeast University (English Edition), 2012, 28 (1): 94-99. [doi:10.3969/j.issn.1003-7985.2012.01.016]
Copy
Fatigue reliability quantitative analysis of cement concretefor highway pavement under high stress ratio(
)
高应力比下路用水泥混凝土疲劳可靠度量化分析
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 28
- Issue:
- 2012 1
- Page:
- 94-99
- Research Field:
- Traffic and Transportation Engineering
- Publishing date:
- 2012-03-30
Info
- Title:
- Fatigue reliability quantitative analysis of cement concretefor highway pavement under high stress ratio
- 高应力比下路用水泥混凝土疲劳可靠度量化分析
- Author(s):
- Xue Yanqing; Huang XiaomingQian Shunzhi; Ma TaoZou Xiangheng
- School of Transportation, Southeast University, Nanjing 210096, China
- Keywords:
- cement concrete; fatigue life; fatigue damage; probability density function; high stress ratio; fatigue reliability
- PACS:
- U416.21
- DOI:
- 10.3969/j.issn.1003-7985.2012.01.016
- Abstract:
- In order to obtain the change law of the fatigue reliability of cement concrete for highway pavement under high stress ratios, first, the probability densities of monotonic random variables including concrete fatigue life are deduced. And then, the fatigue damage probability densities of the Miner and Chaboche-Zhao models are deduced. By virtue of laboratory fatigue test results, the fatigue damage probability density functions of the two models can be obtained, considering different stress ratios. Finally, substituting load cycles into them, the change law of cement concrete fatigue reliability about load cycles can be acquired. The results show that under the same stress ratio, with the increase in the load cycle, the fatigue reliability declines from almost 100% to 0% gradually. No matter under what stress ratio, during the initial stage of the load action, there is always a relatively stable phase for fatigue reliability. With the increase in the stress ratio, the stable phase gradually shortens and the load cycle corresponding to the reliability of 0% also decreases. In the descent phase of reliability, the higher the stress ratio is, the lower the concrete reliability is for the same load cycle. Besides, compared with the Chaboche-Zhao fatigue damage model, the Miner fatigue damage model is safer.
- 为获得路用水泥混凝土在高应力比作用下其疲劳可靠度的变化规律, 首先推导了包括混凝土疲劳寿命在内的单调随机变量的概率密度, 然后推导了Miner与Chaboche-Zhao疲劳损伤模型的概率密度.借助室内疲劳试验结果, 获得这2种模型的疲劳损伤概率密度函数.最后, 将荷载作用次数代入上述函数, 从而获得水泥混凝土疲劳可靠度随荷载作用次数的变化规律.结果表明:随着荷载作用次数的增加, 相同应力比下, 疲劳可靠度从100%逐渐衰减为0%;无论何种应力比, 在荷载作用初期, 疲劳可靠度均有一个较为稳定的阶段;随着应力比的增加, 该稳定阶段逐渐缩短, 且可靠度为0%时对应的荷载作用次数也减小;在可靠度衰减阶段, 对于相同荷载作用次数, 应力比越高, 则混凝土可靠度越低;此外, Miner疲劳损伤模型比Chaboche-Zhao疲劳损伤模型偏安全.
References:
[1] Zhao Yongli, Sun Wei. Establishment of the fatigue damage equation of the concrete material [J]. Journal of Chongqing Jiaotong Institute, 1999, 18(1):17-22.(in Chinese)
[2] Sun Zhilin. Research on fatigue damage of asphalt pavement based on damage mechanics [D]. Nanjing: School of Transportation of Southeast University, 2008.(in Chinese)
[3] Zheng Zhanguang, Cai Ganwei, Li Zhaojun. A new model of fatigue damage evolution [J]. Engineering Mechanics, 2010, 27(2): 37-40.(in Chinese)
[4] Xu Jinquan, Guo Fengming. Mechanism of fatigue damage evolution and the evolution law [J]. Journal of Mechanical Engineering, 2010, 46(2): 40-46.(in Chinese)
[5] Chaboche J L, Lesne P M A. Linear continuous fatigue damage model [J]. Fatigue and Fracture of Engineering Materials Structure, 1988, 11(1): 1-17.
[6] Chandrakanth S, Pandey P C. An isotropic damage model for ductile material [J]. Engineering Fracture Mechanics, 1995, 50(4): 457-465.
[7] Song Baisheng, Luo Qinglai. Advanced mathematics [M]. Beijing: Advanced Education Press, 2001.(in Chinese)
[8] Cao Zhenhua, Zhao Ping. Probability and mathematical statistics [M]. Nanjing: Southeast University Press, 2004.(in Chinese)
[9] Li Yongqiang, Che Huimin. A study on the cumulative damage to plain concrete due to flexural fatigue [J]. China Railway Science, 1998, 19(2): 52-58.(in Chinese)
[10] Ministry of Transport of the People’s Republic of China. JTG D40—2002 specifications of cement concrete pavement design for highway [S]. Beijing: China Communications Press, 2002.(in Chinese)
[11] Shi Xiaoping, Yao Zukang, Li Hua, et al. Study on flexural fatigue behavior of cement concrete [J]. China Civil Engineering Journal, 1990, 23(3): 11-21.(in Chinese)
[12] Jiang Yingjun, Dai Xuezhen. Study on mechanism of cement concrete pavement damage of heavy-duty traffic road and countermeasures [J]. Journal of Highway and Transportation Research and Development, 2005, 22(7): 31-35.(in Chinese)
Memo
- Memo:
-
Biographies: Xue Yanqing(1985—), male, graduate; Huang Xiaoming(corresponding author), male, doctor, professor, huangxm@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51008071), the Natural Science Foundation of Jiangsu Province(No.BK2010413).
Citation: Xue Yanqing, Huang Xiaoming, Qian Shunzhi, et al. Fatigue reliability quantitative analysis of cement concrete for highway pavement under high stress ratio[J].Journal of Southeast University(English Edition), 2012, 28(1):94-99.[doi:10.3969/j.issn.1003-7985.2012.01.016]