Li Qiang, Jin Xianyu, Wu Dan, Ye Hailong
College of Civil Engineering and Architecture, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China.
Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China.
Sensors (Basel). 2020 Apr 23;20(8):2412. doi: 10.3390/s20082412.
In this work, the failure process of non-corroded and corroded reinforced concrete (RC) columns under eccentric compressive loading is studied using the acoustic emission (AE) technique. The results show that reinforcement corrosion considerably affects the mechanical failure process of RC columns. The corrosion of reinforcement in RC columns leads to highly active AE signals at the initial stage of loading, in comparison to the non-corroded counterparts. Also, a continuous AE hit pattern with a higher number of cumulative hits is observed for corroded RC columns. The spatial distribution and evolution of AE events indicate that the reinforcement corrosion noticeably accelerates the initiation and propagation of cracking in the RC columns during compressive loading. The AE characteristics of corroded RC columns are in agreement with the macroscopic failure behaviors observed during the damage and failure process. A damage evolution model of corroded RC columns based on the AE parameters is proposed.
在这项工作中，采用声发射（AE）技术研究了无腐蚀和腐蚀钢筋混凝土（RC）柱在偏心受压荷载作用下的破坏过程。结果表明，钢筋锈蚀对RC柱的力学破坏过程有显著影响。与未腐蚀的RC柱相比，RC柱中钢筋的腐蚀在加载初期会导致高活性的AE信号。此外，对于腐蚀的RC柱，观察到具有更高累积计数的连续AE撞击模式。AE事件的空间分布和演化表明，钢筋腐蚀在压缩加载过程中显著加速了RC柱中裂缝的萌生和扩展。腐蚀RC柱的AE特性与损伤和破坏过程中观察到的宏观破坏行为一致。提出了基于AE参数的腐蚀RC柱损伤演化模型。
