摘要
文中考虑了钢筋混凝土本身的非匀质特性,采用数值模拟方法,在细观尺度上对混凝土结构中氯离子的扩散规律展开研究.基于将混凝土视为三相不均匀复合材料,分别建立了考虑骨料阻滞作用及钢筋阻滞作用的离散化模型.对模型进行分析,引入骨料综合作用修正系数kag、钢筋阻滞作用修正系数ks以及角部钢筋修正系数kcr.在此基础上,结合可靠度理论并考虑推导出的三个修正系数,选择线性结合机制对氯离子侵蚀环境中的钢筋混凝土空心板桥展开耐久性评价,最终得到该桥的耐久性寿命.
In this paper, the inhomogeneous characteristics of reinforced concrete were considered, and the diffusion law of chloride ions in concrete structures was studied on a meso-scale by numerical simulation method. Based on treating concrete as a three-phase heterogeneous composite material, discrete models considering aggregate retardation and reinforcement retardation were established respectively. Based on the analysis of the model, the aggregate comprehensive effect correction coefficient k ag , the reinforcement blocking effect correction coefficient k s and the corner reinforcement correction coefficient k cr were introduced. On this basis, combined with the reliability theory and considering the derived three correction coefficients, the linear combination mechanism was selected to evaluate the durability of the reinforced concrete hollow slab bridge in chloride ion erosion environment, and finally the durability life of the bridge was obtained.
作者
段瑞芳
乔星昇
白云腾
DUAN Ruifang;QIAO Xingsheng;BAI Yunteng(Shaanxi College of Communication Technology, Xi’an 710018, China;Xi’an Municipal Engineering Design & Research Institute Co. Ltd., Xi’an 710064, China;Highway Institute, Chang’an University, Xi’an 710064, China)
出处
《武汉理工大学学报（交通科学与工程版）》
2019年第5期825-831,共7页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
陕西省教育厅专项科学研究计划（17JK0070）
陕西省自然科学青年基金（2017JQ5013）
中央高校基本科研业务费专项资金（310821172006）资助
关键词
细观模拟
氯离子
可靠度
混凝土耐久性
空心板
mesoscopic simulation
chloride ion
reliability
concrete durability
hollow slab
