Fatigue life prediction of fatigue damaged and chloride corroded RC beams

被引：0
|
作者：
Xu J. [1 ]
Wu J. [2 ]
Chen S. [3 ]
Diao B. [4 ]
Zhao T. [1 ]
机构：
[1] Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd, Beijing
[2] Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing
[3] School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou
[4] School of Transportation Science and Engineering, Beihang University, Beijing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2022年 / 43卷
关键词：
chloride exposure; fatigue damage; fatigue life prediction; steel corrosion initiation time;
D O I：
10.14006/j.jzjgxb.2022.S1.0008
中图分类号：
学科分类号：
摘要：
To evaluate the fatigue life of RC structures in a marine or deicing environment, the effects of the fatigue load level (ratio of the maximum fatigue load to the static ultimate strength), initial fatigue loading cycles, chloride exposure duration and reinforcement ratio were taken into consideration. The corrosion initiation time of fatigue-damaged RC beams under a two-dimensional chloride diffusion state was calculated based on Fick’s Second law, and the relationship between the residual fatigue life and corrosion initiation time was analyzed. The fatigue life prediction model of fatigue-damaged RC beams after chloride corrosion was proposed, and then suggestions for the fatigue durability design and evaluation were given. The results show that the fatigue load level (no less than 0. 4), initial fatigue loading cycles (no more than 0. 4 million) and chloride corrosion exposure duration have significant influences on the corrosion initiation time, while the initial fatigue loading cycles (0. 4-1. 2 million) and the reinforcement ratio hardly affect it. The corrosion initiation time is exponentially correlated with the residual fatigue life, based on which a fatigue life prediction model is proposed, which is in good agreement with the test value. This model is based on the diffusion of chloride ions in concrete, which is applicable for the fatigue life evaluation of in-service RC bridges. The durability of RC bridges in areas not directly in contact with seawater (e. g., 2. 84 km or more from the coast) could not be neglected. © 2022 Science Press. All rights reserved.
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页码：69 / 76
页数：7
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