锈蚀钢筋混凝土梁地震损伤分析

发布时间：2018-11-16 07:01

【摘要】：对12根锈蚀钢筋混凝土梁进行了地震损伤分析,得到锈蚀梁地震损伤指数随加载循环水平的变化曲线,即D-N曲线,分析了锈蚀钢筋混凝土梁地震损伤演化规律以及钢筋锈蚀率、试件破坏形式对地震损伤指数的影响。研究结果表明:锈蚀钢筋混凝土梁地震损伤指数随循环水平的增加而增大,且地震损伤指数增长速率逐渐加大;同一循环水平下锈蚀梁地震损伤指数随锈蚀率的增加而增大,而对于锈蚀率低于5%的锈蚀混凝土梁试件,由于锈蚀改善了钢筋与混凝土间的粘结性能,其损伤指数略低于未锈蚀梁的损伤指数;纵筋与箍筋同时锈蚀的混凝土梁地震损伤演化规律与仅箍筋锈蚀的混凝土梁损伤演化类似;随着锈蚀率增大,锈蚀钢筋混凝土梁将由弯曲破坏演变为剪切破坏,与发生弯曲破坏的锈蚀梁相比,锈蚀梁发生剪切破坏时地震损伤指数较小,但绝大多数损伤指数均大于0.6;锈蚀钢筋混凝土梁地震损伤模型中试件经历的循环加载位移幅值对损伤指数起主控作用。
[Abstract]:The seismic damage analysis of 12 corroded reinforced concrete beams is carried out, and the variation curve of seismic damage index with loading cyclic level, namely D-N curve, is obtained. The evolution law of seismic damage of corroded reinforced concrete beams, the influence of corrosion rate of steel bars and the failure form of specimens on the seismic damage index are analyzed. The results show that the seismic damage index of corroded reinforced concrete beams increases with the increase of cyclic level, and the growth rate of seismic damage index increases gradually. At the same cyclic level, the seismic damage index of corroded beams increases with the increase of corrosion rate. However, for specimens of corroded concrete beams with corrosion rate less than 5%, corrosion improves the bond behavior between reinforcement and concrete. The damage index is slightly lower than that of non-corroded beams. The seismic damage evolution of concrete beams corroded by longitudinal and stirrups at the same time is similar to that of concrete beams with only stirrups. With the increase of corrosion rate, the corroded reinforced concrete beams will change from flexural failure to shear failure. Compared with the corroded beams with bending failure, the seismic damage index of corroded beams is smaller when shear failure occurs. However, most of the damage indexes were greater than 0.6; In the seismic damage model of corroded reinforced concrete beams, the amplitude of cyclic loading displacement plays a major role in controlling the damage index.
【作者单位】：长安大学建筑工程学院;
【基金】：国家自然科学基金项目资助(51578077) 陕西省自然科学基金项目(2016JM5041) 中央高校科研业务费专项经费项目资助(310828152017,310828163410)
【分类号】：TU375.1

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