Abarkane Chihab, Rescalvo Francisco J, Donaire-Ávila Jesús, Galé-Lamuela David, Benavent-Climent Amadeo, Gallego Molina Antolino
Building Engineering School, University of Granada, 18071 Granada, Spain.
Department of Mechanical and Mining Engineering, University of Jaén, 23009 Jaén, Spain.
Materials (Basel). 2019 Aug 30;12(17):2804. doi: 10.3390/ma12172804.
This paper shows the acoustic emission (AE) analysis recorded during the loading process of reinforced concrete (RC) structures subjected to bidirectional seismic loadings. Two waffle plates (bidirectional) supported by isolated square columns were tested on a shaking table with a progressive and increasing ground acceleration until the final collapse. Each specimen was subjected to a different loading history. A relevant delay in the beginning of the significant AE energy is observed as the peak value of the ground acceleration increases. Based on this result, a new AE temporal damage index (TDI), defined as the time difference between the onset of the significant AE activity and the onset of the loading that causes this AE activity, is proposed and validated by comparing it with the plastic strain energy released by the concrete, typically used as a reliable damage level indicator. Good agreement was observed for both specimens and seismic inputs.
本文展示了在双向地震荷载作用下钢筋混凝土（RC）结构加载过程中记录的声发射（AE）分析。在振动台上对由独立方柱支撑的两块华夫板（双向）进行了测试，地面加速度逐渐增加直至最终破坏。每个试件经历了不同的加载历史。随着地面加速度峰值的增加，在显著AE能量开始时出现了明显的延迟。基于这一结果，提出了一种新的AE时间损伤指数（TDI），定义为显著AE活动开始与引起该AE活动的加载开始之间的时间差，并通过与混凝土释放的塑性应变能（通常用作可靠的损伤水平指标）进行比较来验证。对于两个试件和地震输入，均观察到了良好的一致性。
