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A Combined method of AC Impedance Measurement and BE Inverse Analysis for Detecting Corroded Rebar in Concrete Structure

A Combined method of AC Impedance Measurement and BE Inverse Analysis for Detecting Corroded Rebar in Concrete Structure
交流阻抗测量与BE反演相结合的混凝土结构中钢筋锈蚀检测方法
批准号:
10450045
负责人:
AOKI Shigeru
金额:
$7.1万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
1998
资助国家:
日本
项目状态:
已结题
起止时间:
1998 至 1999

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中文摘要
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英文摘要
An effective boundary element inverse analysis method was developed to detect the corrosion location and corrosion rate of rebars in a concrete structure. This method consists of two steps. The outlines of these steps are shown below.The first step is the effective non-destractive detection of corrosion locations by combining potential measurement and boundary element inverse analysis. The boundary element inverse analysis method for this step was developed based on the boundary element direct corrosion analysis method, which had been developed before. In this inverse method, the corroded part in the rebar net was approximated as a circle, i.e., the part of the rebars in the circle is taken to be corroded. The radius r and the coordinates (x, y) are taken as design variables, and the difference between the measured and calculated values of potential is taken as the cost function robe minimized. The polarization characteristics of the corroded and non-corroded parts are assumed to be gi … More ven. The minimization is performed through use of the Simplex method. The usefulness of the method was demonstrated by solving an example problem.The second step is the identification of the corrosion rate of the corroded part which was detected in the first step. The identification of the corrosion rate is performed by improving the AC impedance method. A boundary element inverse analysis was utilized to improve the AC impedance method. At first, it was verified experimentally that the potential in the concrete domain is described with the Laplace's equation. The potential at any point in the concrete domain can be calculated by solving the Laplace's equation with the boundary element method.Then, an inverse problem was formulated in which the location and the complex impedance (corrosion rate can be obtained from the complex impedance) of corroded part on the surface of a rebar are estimated from a small number of potential data measured on the surface of a concrete structure. The cost function to be minimized in the inverse problem is a function of difference between the measured and calculated values of potential. The validity and efficiency of the proposed method were demonstrated with an example in which a prismatic concrete block specimen with an embedded piece of rebar was used. Less
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M.Ridha,K.AMAYA,S.AOKI,: "Inverse Analysis for Determining the Location and Rate of Corrosion of steel Embedded in Concrete"Proceedings of Int.Seminar of NAE 2000. (発表予定). (2000)
M. Ridha、K. AMAYA、S. AOKI,:“确定嵌入混凝土中的钢的位置和腐蚀速率的反演分析”NAE 2000 年国际研讨会论文集。(待提交)。
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M.Ridha,天谷賢治,青木繁: "Improvement of AC Impedance Method for Monitoring Corrosion of Rebar in Concete Stracture by Boundary Element Inverse Analysis"材料と環境. 48巻10号. 654-659 (1999)
M. Ridha、Kenji Amaya、Shigeru Aoki:“通过边界元逆分析监测 Concete 结构中钢筋腐蚀的交流阻抗方法的改进”《材料与环境》第 48 卷,第 10 期。654-659 (1999)。
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20
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    • 批准号:
      25281001
    • 项目类别:
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    • 资助金额:
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    • 财政年份:
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    • 资助金额:
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    • 资助金额:
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    • 批准号:
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    • 项目类别:
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    • 资助金额:
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    • 财政年份:
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