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锈蚀RC梁抗弯性能试验与数值分析

Keywords: 桥梁工程,锈蚀梁,数值模拟,性能退化,粘结滑移

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Abstract:

?为了给锈蚀RC结构性能退化评估提供参考,制作了12片RC梁和5个粘结试件,通电加速腐蚀RC梁和粘结试件,考虑不同锈蚀率和保护层厚度对锈蚀梁性能退化的影响,建立可以考虑粘结滑移的锈蚀梁性能退化的有限元模型,研究锈蚀梁的抗弯性能退化机理。结果表明:保护层厚度为25mm时,梁挠度的增加速率随着锈蚀率的增大而增大,而当保护层厚度分别达到30mm和35mm时,锈蚀梁与未锈蚀梁的挠度随荷载增加的速率差别不大;锈蚀破坏了结构的整体性、刚度以及钢筋与混凝土的粘结作用,是结构性能退化的主要原因;考虑粘结滑移的有限元数值模拟结果与试验结果较为吻合。

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