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材料导报  2024, Vol. 38 Issue (20): 23090009-8    https://doi.org/10.11896/cldb.23090009
  无机非金属及其复合材料 |
考虑混凝土细观非均质性的钢筋混凝土结构疲劳寿命预测概率模型
金浏, 杨健, 吴洁琼*, 杜修力
北京工业大学城市与工程安全减灾教育部重点实验室,北京 100124
Probabilistic Prediction Model of Fatigue Life of RC Structures Considering the Meso-scale Inhomogeneity of Concrete
JIN Liu, YANG Jian, WU Jieqiong*, DU Xiuli
The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
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摘要 本工作考虑混凝土细观非均质性,将混凝土视为由粗骨料、砂浆基质和界面过渡区组成的三相复合材料,建立了疲劳损伤混凝土中氯离子扩散的三维细观数值分析模型。研究表明,随着疲劳荷载水平、水灰比、温度的升高以及暴露时间的延长,混凝土内氯离子浓度显著增加,但同一深度处氯离子浓度不尽相同。根据K-S检验,在5%显著性水平上,混凝土内某一深度的氯离子浓度遵循混合正态分布。据此提出了结构疲劳寿命预测概率模型,发现结构失效概率随疲劳寿命的延长而增大,且疲劳应力水平、水灰比、温度的降低以及暴露时间的减少均可使结构失效概率降低,结构在服役期间承受的疲劳应力水平不宜超过0.4(失效概率10%和200万次疲劳寿命)。此外,基于上述模型,对我国四个沿海城市混凝土结构的疲劳寿命进行了预测,并提出了相应的耐久性建议。
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金浏
杨健
吴洁琼
杜修力
关键词:  钢筋混凝土梁  数值模拟  混凝土非均质性  概率密度  疲劳寿命    
Abstract: A 3D microscopic numerical model for chloride diffusion in fatigue-damaged concrete was established, where the concrete was treated as a three-phase composite consisting of coarse aggregate, mortar matrix and ITZ to consider its inhomogeneity. Results showed that the chloride concentration in concrete increases significantly with the increase of fatigue stress level, water-cement ratio, temperature and exposure time, in which the chloride concentration at the same depth is different. According to the K-S test, the chloride concentration at a certain concrete depth follows the mixed normal distribution at a 5% significance level, based on which, a probabilistic fatigue life prediction model is proposed. It was found that the failure probability increases with the increase of fatigue life, but decreases with the decrease of fatigue stress level, water-cement ratio, temperature and exposure time. Hence it was suggested that RC structure should be maintained a fatigue stress level of below 0.4 (failure probability of 10% and 2 million cycles of fatigue life) during its service. In addition, based on the proposed model, the fatigue life of RC structures in four coastal cities was predicted and the related durability recommendations were given.
Key words:  RC beam    numerical simulation    concrete inhomogeneity    probability density    fatigue life
出版日期:  2024-10-25      发布日期:  2024-11-05
ZTFLH:  TU375.1  
基金资助: 国家自然科学基金(52108106);北京市杰出青年科学基金(JQ22025)
通讯作者:  * 吴洁琼,北京工业大学校聘教授、博士研究生导师。2014—2020年于北京航空航天大学硕博连读,获博士学位。目前主要从事混凝土结构疲劳和耐久性等方面的研究工作。主持国家和省部级课题3项,发表学术论文30余篇,以第一或通信作者发表SCI论文17篇、EI论文4篇。jieqiong.wu@bjut.edu.cn   
作者简介:  金浏,北京工业大学教授、博士研究生导师,国家优青、北京市杰青,国家自然科学基金创新研究群体骨干,兼任中国地震学会基础设施防震减灾青年委员会主任委员等。主要研究方向包括混凝土材料与构件尺寸效应、混凝土结构多灾害效应。主持国家重点研发计划等国家级项目6项;出版中、英文学术著作2部、教材2部;发表学术论文300余篇,以第一或通信作者发表SCI论文145篇、EI论文120篇;获国家专利、软件著作权授权12项;参编国家标准1项;获省部级及学会一等奖2项、二等奖2项;获Elsevier中国高被引学者、斯坦福全球前2%科学家荣誉称号。
引用本文:    
金浏, 杨健, 吴洁琼, 杜修力. 考虑混凝土细观非均质性的钢筋混凝土结构疲劳寿命预测概率模型[J]. 材料导报, 2024, 38(20): 23090009-8.
JIN Liu, YANG Jian, WU Jieqiong, DU Xiuli. Probabilistic Prediction Model of Fatigue Life of RC Structures Considering the Meso-scale Inhomogeneity of Concrete. Materials Reports, 2024, 38(20): 23090009-8.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.23090009  或          http://www.mater-rep.com/CN/Y2024/V38/I20/23090009
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