为建立锈蚀钢筋混凝土构件恢复力模型，本文通过对6个锈蚀钢筋混凝土受弯构件低周反复荷载试验，得到不同锈蚀程度的各试件的滞回曲线及骨架曲线，分析了钢筋锈蚀对试件抗震性能的影响。根据试验成果，结合钢筋锈蚀引起结构破坏形态的改变，综合考虑钢筋锈蚀后引起结构截面几何损伤、钢筋和混凝土力学性能降低、粘结滑移性能劣化以及结构刚度退化等各种耐久性损伤因素，并考虑箍筋锈蚀引起结构延性的影响，提出了锈蚀钢筋混凝土构件基于地震损伤的恢复力模型的确定方法。通过与试验进行对比分析表明模型描绘的骨架曲线和滞回曲线与试验结果总体吻合较好，所描述的现象与试验一致，该恢复力模型可在损伤钢筋混凝土结构地震反应分析中采用。
Abstract
To study the restoring force Model of corroded reinforced concrete members based on seismic damage, this paper studied on the cyclic loading on six corroded flexural members, and the hysteresis loop and skeleton curve of various degrees of corroded reinforced concrete specimens were obtained and the effects of reinforcement corrosion on specimen anti-seismic property were analyzed. Based on test result, combining with morphological changes of the structures due to steel corrosion，all kinds of durability damages of structure, such as: geometrical damage of concrete cross-section, mechanical performance degradation of concrete and reinforcement, bond-slip performance degradation, stiffness degradation and so on, and amendment caused by stirrup corrosion, the method to determine restoring force model of corroded reinforced concrete members under flexural and compressive stress is proposed. After comparing with experimental data, calculated skeleton curves and hysteretic curves of this model agree well with trial values and the phenomenon described by the model is in agreement with the experiment results, which can be used in the seismic response analysis of damage reinforced concrete structures.
关键词
钢筋混凝土 /
锈蚀 /
恢复力模型 /
抗震
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Key words
Reinforced concrete /
Corroded /
Restoring force model；Anti-seismic
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