摘要
通过选用合适的材料本构模型和粘结滑移模型,建立了锈蚀钢筋混凝土构件的有限元分析模型,以钢筋锈蚀率和轴压比为变量,对锈蚀钢筋混凝土压弯构件进行数值分析,旨在为在役锈损结构的非线性分析奠定基础.分析结果表明,钢筋锈蚀率和轴压比同时影响着锈损构件的性能劣化;构件的承载能力和变形能力均随锈蚀率的增加而降低;粘结力退化加剧了构件性能劣化,且小轴压比构件对粘结力退化更为敏感;就锈蚀率而言,构件性能劣化较粘结性能退化有一定的滞后;性能降低幅度也与轴压比有关,小轴压比构件的退化幅度相对较大;对于高轴压比构件,变形能力退化较少,而承载力退化幅度大于变形退化幅度.
By selecting proper material stress-strain relationship and bond-slip model between corroded steel bar and concrete, finite element model of corroded reinforced concrete members is built. Taking corrosion rate of steel bar and axial compression ratio as variables, numerical value analysis is made on corroded reinforced concrete compressive and flexural members, which aims to provide basis for non-linear analysis of existing corrosion-damaged structures. Results of analysis indicate that both corrosion rate and axial compression ratio affect the performance of corrosion-damaged members, and with the increased corrosion rate of steel bar, bending capacity and deformation capacity of members decrease. The degrading of bond quickens the deterioration of member＇s behaviors, and members with low axial compression ratio are more sensitive to the degrading of bond. And in terms of corrosion rate, deterioration of member＇s behaviors lags behind the degrading of bond; and the deterioration extent of behaviors is also related with axial compression ratio. The extent of member with low axial compression ratio is high, and for member＇s with high axial compression ratio, its deformation capacity decreases a little, while the decrease of bearing capacity is larger than deformation capacity.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2005年第3期326-331,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50078044)
陕西省教育厅专项基金资助项目(00JK241)
关键词
锈蚀
钢筋
混凝土
压弯构件
有限元分析
corrosion
steel bar
concrete
compressive and flexural member
finite element analysis
