Quantitative Damage Evaluation of Concrete by AE Rate Process Analaysis

AE速率过程分析定量混凝土损伤评价

• 批准号: 13450181
• 负责人: OHTSU Masayasu
• 金额: $ 8.06万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450181/
• 关键词: Acoustic Emission; Core Test; Damage Mechanics; Compression Test; Young's Modulus; アコースティック・エミッション; 損傷力学; アコーステイツク・エミッション; 圧縮強度

In recent years, the deterioration of concrete structures has been a public problem, and maintenance techniques have been subjected to intensive research. For the strategic maintenance, it is of significant importance to evaluate not only the strength of concrete but also the degree of damage in concrete. Accordingly, quantitative damage assessment of concrete is developed and proposed by applying acoustic emission (AE) technique and damage mechanics.Concrete samples damaged by freezing and thawing and carbonation processes are examined as the controlled damage. The quantitative damage evaluation based on fracturing behavior of concrete under uniaxial compression is studied. Since AE behavior of concrete is dependent on the degree of damage, a relation is formulated by the rate process analysis. Employing Loland's model, a relationship between stress and strain is modeled, and then the applicability of the damage parameter is confirmed. By calculating the relative damage, which is evaluated as the ratio of initial Young's modulus to the intact modulus, from AE rate-process analysis, the initial damage of an actual structure is estimated. The results estimated are in remarkable agreement with the actual damages in the controlled samples. Consequently, a data-base is constructed to apply the proposed method to concrete core-samples taken from existing structures.

近年来，混凝土结构的劣化一直是一个公共问题，维修技术也受到了广泛的研究。在战略养护中，不仅要评估混凝土的强度，而且要评估混凝土的损伤程度。在此基础上，应用声发射技术和损伤力学理论，对混凝土冻融和碳化过程中的损伤进行了定量评估。研究了基于混凝土单轴受压断裂行为的损伤定量评估方法。由于混凝土的声发射行为依赖于损伤程度，因此通过速率过程分析建立了两者之间的关系。采用Loland模型，建立了应力应变关系模型，确定了损伤参数的适用性。通过计算声发射率过程分析得到的相对损伤，即初始杨氏模数与完整模数的比值，来估计实际结构的初始损伤。估算结果与受控样品的实际损伤情况吻合较好。因此，建立了一个数据库，将所提出的方法应用于现有结构的混凝土芯样。

项目成果

M.Ohtsu, T.Iida: "Quantitative Damage Evaluation of Concrete Core Samples by Acoustic Emission"Nondestructive Characterization of Materials X (Elsevier). 257-264 (2001)

M.Ohtsu、T.Iida：“通过声发射对混凝土芯样进行定量损伤评估”材料 X 的非破坏性表征（Elsevier）。

M.Ohtsu, M.Uchida, T.Okamoto, S.Yuyama: "Damage Assessment of Reinforced Concrete Beams qualified by AE"ACI Structural Journal. Vol.99, No.4. 411-417 (2002)

M.Ohtsu、M.Uchida、T.Okamoto、S.Yuyama：“AE 合格的钢筋混凝土梁的损伤评估”ACI 结构杂志。

鈴木哲也, 渡辺弘史, 大津政康: "AE法によるコンクリートの定量的損傷度評価に関する研究"応用力学論文集. Vol.5. 809-816 (2002)

Tetsuya Suzuki、Hiroshi Watanabe、Masayasu Otsu：“使用 AE 方法进行混凝土的定量损伤评估”应用力学杂志，第 5 卷，809-816（2002 年）。

M.Ohtsu, H.Watanabe: "Quantitative Damage Estimation of Concrete by Acoustic Emission"Journal of Construction and Building Materials. 15. 217-224 (2001)

M.Ohtsu，H.Watanabe：“通过声发射对混凝土进行定量损伤估算”建筑与建筑材料杂志。

鈴木哲也, 渡辺弘史, 大津政康: "AE法によるコンクリートの定量的損傷度評価に関する研究"応用力学論文集. 15. 809-816 (2002)

Tetsuya Suzuki、Hiroshi Watanabe、Masayasu Otsu：“使用 AE 方法定量评估混凝土损伤的研究”应用力学杂志 15. 809-816 (2002)。