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Acoustic emission energy b-value for local damage evaluation in reinforced concrete structures subjected to seismic loadings

机译：地震荷载下钢筋混凝土结构局部损伤评估的声发射能量b值

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摘要

A modification of the original b-value (Gutenberg-Richter parameter) is proposed to evaluate local damage of reinforced concrete structures subjected to dynamical loads via the acoustic emission (AE) method. The modification, shortly called energy b-value, is based on the use of the true energy of the AE signals instead of its peak amplitude, traditionally used for the calculation of b-value. The proposal is physically supported by the strong correlation between the plastic strain energy dissipated by the specimen and the true energy of the AE signals released during its deformation and cracking process, previously demonstrated by the authors in several publications. AE data analysis consisted in the use of guard sensors and the Continuous Wavelet Transform in order to separate primary and secondary emissions as much as possible according to particular frequency bands. The approach has been experimentally applied to the AE signals coming from a scaled reinforced concrete frame structure, which was subjected to sequential seismic loads of incremental acceleration peak by means of a 3 × 3 m~2 shaking table. For this specimen two beam-column connections-one exterior and one interior-were instrumented with wide band low frequency sensors properly attached on the structure. Evolution of the energy b-value along the loading process accompanies the evolution of the severe damage at the critical regions of the structure (beam-column connections), thus making promising its use for structural health monitoring purposes.
机译：提出了对原始b值（Gutenberg-Richter参数）的修改，以通过声发射（AE）方法评估承受动态载荷的钢筋混凝土结构的局部损伤。这种修改简称为能量b值，是基于AE信号的真实能量的使用，而不是传统上用于计算b值的峰值幅度。该提议在物理上得到了样品耗散的塑性应变能与变形和破裂过程中释放的AE信号的真实能量之间的强相关性的支持，这在作者先前在数个出版物中得到了证明。声发射数据分析包括使用保护传感器和连续小波变换，以便根据特定频段尽可能地分离一次和二次发射。该方法已被实验性地应用于来自比例缩放的钢筋混凝土框架结构的AE信号，该信号通过3×3 m〜2振动台承受了连续的地震加速度增量峰值。对于该样品，在两个梁柱连接处（一个外部和一个内部）安装了正确安装在结构上的宽带低频传感器。能量b值在加载过程中的演变伴随结构的关键区域（梁-柱连接）的严重破坏的演变，因此使其有望用于结构健康监测目的。

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  • 来源
    《Mechanical systems and signal processing》 |2018年第1期|262-277|共16页
  • 作者

    Francisco Sagasta; Miguel E. Zitto; Rosa Piotrkowski; Amadeo Benavent-Climent; Elisabet Suarez; Antolino Gallego;

  • 作者单位

    Department of Applied Physics, University of Granada, Building Engineering School, Granada 18071, Spain;

    Department of Mathematics, Engineering Faculty, University of Buenos Aires, Av. Paseo Colon 850, Buenos Aires, Argentina;

    Department of Mathematics, Engineering Faculty, University of Buenos Aires, Av. Paseo Colon 850, Buenos Aires, Argentina,School of Science and Technology, University of San Martin, Av. 25 de Mayo, San Martin, Buenos Aires, Argentina;

    Department of Structural Mechanics and Industrial Constructions, Polytechnic University of Madrid, Madrid 28006, Spain;

    Department of Applied Physics, University of Granada, Building Engineering School, Granada 18071, Spain;

    Department of Applied Physics, University of Granada, Building Engineering School, Granada 18071, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Acoustic emission; Damage evaluation; Reinforced concrete; Seismic loadings; Wavelet transform; b-value;

    机译：声发射;损害评估;钢筋混凝土;地震荷载;小波变换b值;

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