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采用人工气候环境加速锈蚀方法,研究了不同偏心距的锈蚀钢筋混凝土压弯构件破坏形态、延性、承载力及其结构性能退化机理,并针对不同锈蚀程度的大、小偏压构件的荷载-挠度关系、荷载-纵向压缩变形及偏压构件的承载能力进行了相应分析.结果表明:钢筋锈蚀会引起钢筋力学性能下降、混凝土保护层锈胀开裂、黏结锚固性能退化及箍筋的锈蚀程度比纵筋严重等,从而导致压弯构件的破坏形态发生变化;受拉钢筋达到屈服后,受压区混凝土很快达到极限压应变,锈蚀构件的延性性能明显降低,脆性性能则明显增加.在试验结果分析基础上,建立了与纵向锈胀裂缝宽度相关的锈蚀压弯构件侧向挠度、开裂荷载及极限荷载的预计模型,为老化混凝土结构检测加固设计时提供应用参考.
In this paper, the accelerated corrosion method was used to study the failure modes, ductility, bearing capacity and structural degradation mechanism of corroded RC beams with different eccentricity. The load-deflection curves of large and small biased components with different corrosion degrees were also studied. The relationship between load and longitudinal compression deformation and the bearing capacity of bias members are analyzed.The results show that the corrosion of steel bars will cause the mechanical properties of steel bars to decrease, the cracking of concrete cover, the degeneration of bond and anchorage performance, The serious failure of the bending component and so on, which lead to the change of the failure state of the compression-bending component. After the yielding of the tension reinforcement, the ultimate compressive strain of the concrete in the compression section reaches the limit, the ductility of the corrosion component obviously decreases and the brittleness increases obviously. Based on the analysis, the prediction model of lateral deflection, cracking load and ultimate load of the corroded bending and bending members in relation to the longitudinal crack width is established, which provides a reference for the detection and reinforcement design of the aged concrete structures.