INVESTIGATION ON THE FATIGUE LIFE PREDICTION OF REINFORCED BEAMS UNDER COMPLEX ENVIRONMENT OF CHLORIDE ION AND STRAY CURRENT
In the industrial field an investigation on how the corrosion environment of chloride ions and stray current can affect damage and fatigue life of reinforced concrete beams (RC beams) is significant.The aim of this work is to study the fatigue behaviors and life prediction of the corroded RC beams by four-point bending fatigue test.A S-N curve was depicted.Based on fatigue modulus degradation,a fatigue life prediction model and a damage evolution model of the corroded RC beams were developed to verify the test results.This model can be used to predict the fatigue life for different loading levels while not needing a great number of repetitive fatigue tests.Parameters in the model depended on the material properties and corrosion test conditions among other things.The studies showed that a second-order polynomial function is fit for describing the variation of residual modulus degradation.The developed models were applied to analyze the fatigue life and the damage deterioration of the RC beams under fatigue load in the corrosion environment of chloride ions and stray current.The results showed that the experimental and prediction results were in good agreement.Non-linear damage accumulation models were proposed to check the experimental observed modulus degradation.Moreover,the developed models give a reasonable explanation of the damage deterioration of the corroded RC beams under corrosion environment of chloride ions and stray current.
Reinforced concrete beam stray current and chloride ion four-bending fatigue test modulus degradation fatigue life model
Mengcheng Chen Kai Wang Zhen Qin Li Xie
School of Civil Engineering, East China Jiaotong University, Nanchang 330013, P.R.China
国际会议
The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)
武汉
英文
867-871
2012-11-17（万方平台首次上网日期，不代表论文的发表时间）