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Debonding detection of FRP strengthened concrete beams by using impedance measurements and an ensemble PSO adaptive spectral model

机译：利用阻抗测量和整体PSO自适应谱模型对FRP加固混凝土梁进行脱胶检测

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摘要

An impedance-based midspan debonding identification method for RC beams strengthened with FRP strips is presented in this paper using piezoelectric ceramic (PZT) sensor-actuators. To reach this purpose, firstly, a two-dimensional electromechanical impedance model is proposed to predict the electrical admittance of the PZT transducer bonded to the FRP strips of an RC beam. Considering the impedance is measured in high frequencies, a spectral element model of the bonded-PZT-FRP strengthened beam is developed. This model, in conjunction with experimental measurements of PZT transducers, is used to present an updating methodology to quantitatively detect interfacial debonding of these kinds of structures. To improve the performance and accuracy of the detection algorithm in a challenging problem such as ours, the structural health monitoring approach is solved with an ensemble process based on particle of swarm. An adaptive mesh scheme has also been developed to increase the reliability in locating the area in which debonding initiates. Predictions carried out with experimental results have showed the effectiveness and potential of the proposed method to detect prematurely at its earliest stages a critical failure mode such as that due to midspan debonding of the FRP strip. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文提出了一种基于阻抗的中跨脱粘识别方法，该方法使用压电陶瓷（PZT）传感器执行器，对FRP筋加固的RC梁进行中跨剥离识别。为了达到这个目的，首先，提出了一个二维机电阻抗模型来预测结合到RC梁的FRP条上的PZT换能器的电导率。考虑到在高频下测量阻抗，建立了键合-PZT-FRP加固梁的频谱单元模型。该模型与PZT换能器的实验测量结果一起，用于提供一种更新的方法，以定量检测这些类型结构的界面剥离。为了在诸如我们这样的具有挑战性的问题中提高检测算法的性能和准确性，通过基于群粒子的集成过程解决了结构健康监测方法。还已经开发了一种自适应网格方案，以提高定位脱胶起始区域的可靠性。通过实验结果进行的预测表明，该方法的有效性和潜力可在其早期阶段尽早检测出关键的失效模式，例如由于FRP条的中跨脱粘所致。 （C）2015 Elsevier Ltd.保留所有权利。

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