Experimental study on influence of tunnel bed stiffness to fatigue damage characteristics of invert concrete

被引：0
|
作者：
Liu N. [1 ]
Peng L. [1 ]
Shi C. [1 ]
机构：
[1] School of Civil and Engineering, Central South University, Changsha
来源：
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2016年 / 44卷 / 12期
关键词：
Bed stiffness; Dynamic strain; Fatigue damage; Invert concrete; Railway tunnel;
D O I：
10.13245/j.hust.161206
中图分类号：
学科分类号：
摘要：
To explore the influence of bedrock stiffness of railway tunnel on the fatigue damage characteristics of invert concrete, for the simulation of invert mechanical environmental, a new device with different bed stiffness were designed in our experiments. Through the experimental research of the invert concrete damage combined the MTS fatigue testing machine, the evolution of the damage mechanism of invert concrete due to both static and cyclic load was revealed. By introducing the resistance coefficient, a fatigue damage model relating the parameter was proposed. The dynamic strain and fatigue damage characteristics of invert concrete were deduced under different bed stiffness. The results show that the bed stiffness has a significant effect on the damage growth ratio and strain increment of TIC. With the decrease of bed stiffness, the damage and strain of invert concrete increases and fatigue failure occurs. The curve of fatigue damage evolution and the curve dynamic strain are in similar shape, which could describe three phases of change characteristics. With the interpolation formula of concrete damage and the R-N curve expressions analyzed, an experimental parameter was given and redefined to quantify the effect of bed stiffness, and the impact of bed stiffness on the concrete damage was also quantified. It is found that the fatigue life of concrete in a uniform environment is higher than 10 times of the concrete under three point bending condition. © 2016, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.
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页码：31 / 37
页数：6
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