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首页> 外文期刊>Smart Materials & Structures >Study on the application of post-embedded piezoceramic transducers for crack detection on earthquake-damaged RC columns
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Study on the application of post-embedded piezoceramic transducers for crack detection on earthquake-damaged RC columns

机译：嵌入式压电陶瓷换能器在地震损坏RC柱裂纹检测中的应用研究

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摘要

In this study, the post-embedded piezoceramic transducers are used to perform structural health monitoring (SHM) and detect crack damage on the reinforced concrete (RC) column. The piezoceramic transducers are utilized as actuators and sensors, respectively. To investigate the use of the piezoceramic transducer in detecting crack damage in RC columns, SHM tests are performed on three full-size RC column specimens with various failure modes under cyclic loading. The sensors are installed at two depth ranges (40-50 and 70-80 mm) beneath the surface of the column to investigate the effect of the sensor depth on the damage index. In this study, the energy and amplitude-based damage indexes are developed. Both approaches follow the same trend under various drift ratios of the specimen. However, the value of energy-based damage index is much higher than the amplitude index for all peak drift ratio of the specimen. From different depth range of piezoceramic transducers, this study recommends a depth of 80 mm as optimal for post-embedded piezoceramic transducers, since it receive more stable signals in various frequencies. In the proposed health monitoring approach using piezoceramic transducers, the equation to predict the maximum residual crack width and damage index smart aggregates are developed. The normalized damage index equation which in this study is referred as 'crack damage index' is introduced and used to calculate the limiting value for each damage level. The suggested value of the crack damage index for each damage level is also provided. The energy, strength and stiffness reduction factors for each damage level, which correlate with the crack damage index, are also presented. These results demonstrate that the proposed post-embedded piezoceramic transducers has the potential to be used as a tool for SHM on an RC column.
机译：在该研究中，嵌入式压电陶瓷换能器用于进行结构健康监测（SHM）并检测钢筋混凝土（RC）柱的裂纹损坏。压电陶瓷换能器分别用作致动器和传感器。为了研究压电陶瓷换能器在检测RC柱中的裂纹损伤时，SHM测试在三个全尺寸RC柱样本上进行，在循环载荷下具有各种故障模式。传感器在柱表面下方的两个深度范围（40-50和70-80mm），以研究传感器深度对损伤指数的影响。在该研究中，开发了能量和基于幅度的损伤指数。两种方法都在样本的各种漂移比下遵循相同的趋势。然而，基于能量的损伤指数的值远高于样品的所有峰值漂移比的幅度指数。从压电陶瓷传感器的不同深度范围内，本研究建议深度为80毫米，作为嵌入式压电陶瓷传感器的最佳选择，因为它在各种频率中接收更稳定的信号。在采用压电陶瓷传感器的建议的健康监测方法中，开发了预测最大残留裂缝宽度和损伤指数智能聚集体的等式。本研究中的归一化损伤指数方程被称为“裂缝损伤指数”被引入并用于计算每个损坏级别的限制值。还提供了每个损害水平的裂纹损伤指数的建议值。还提出了与裂纹损伤指数相关的每个损伤水平的能量，强度和刚度减少因子。这些结果表明，所提出的嵌入式压电陶瓷换能器具有在RC柱上用作SHM的工具。

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