CRACK PREDICTION OF HIGH DURABLE CONCRETE STRUCTURES BASED ON FRACTURE MECHANICS

基于断裂力学的高耐久性混凝土结构裂缝预测

• 批准号: 05650438
• 负责人: OHTSU Masayasu
• 金额: $ 1.54万
• 依托单位: KUMAMOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650438/
• 关键词: FRACTURE MECHANICS; HIGH DURABLE CONCRETE; CRACK; ACOUSTIC EMISSION; BOUNDARY ELEMENT METHOD; アコースティック・エミッション; 高耐久性コンクリート

An application of acoustic emission (AE) techniques to fracture mechanics is investigated and experimental devices for the research purpose are equipped. Fracture mechanics (FM) parameters are studied in experiments of plain and fiber-reinforced concrete, and it is clarified that the size effect of FM parameters should be taken into account for the analysis of crack propagation in concrete. Quantitative AE waveform analysis is developed as SiGMA procedure and is applied to uniaxial compression tests of plate specimens. Results confirm the usefulness of the SiGMA procedure to identify crack locations, crack types, and crack orientations. The boundary element method (BEM) is applied to analyze crack propagation in concrete in arbitrary directions. The analytical procedure is so effective that crack traces obtained in experiments are readily predicted by the BEM analysis.In order to confirm crack kinematics determined by the SiGMA procedure, a post-analysis is developed. Crack nucleation in high durable concrete such as carbon-fiber and steel-fiber reinforced concrete is studied on the basis of fracture mechanics. The ability of the crack prediction by BEM is confirmed in the scaled-down model study.

对声发射技术在断裂力学中的应用进行了研究，并配备了相应的实验装置。对素混凝土和纤维混凝土的断裂力学参数进行了试验研究，指出在混凝土裂缝扩展分析中应考虑断裂力学参数的尺寸效应。将定量声发射波形分析发展为Sigma程序，并将其应用于平板试件的单轴压缩试验。结果证实了Sigma程序在识别裂纹位置、裂纹类型和裂纹方向方面的有效性。应用边界元方法分析了混凝土中任意方向的裂缝扩展。这种分析方法非常有效，可以通过边界元分析很容易地预测实验中获得的裂纹轨迹。为了确认由Sigma过程确定的裂纹运动学，开发了一种后分析。以断裂力学为基础，对碳纤维和钢纤维混凝土等高耐久混凝土的裂纹形核进行了研究。在缩比模型研究中证实了边界元预测裂纹的能力。

项目成果

K.Murakami, Y.Mitsui and T.Urano: "Interaction of Mix Proportion Factor on Mechanical Characteristics of Steel Fiber Reinforced Concrete" JCA Proc.Cement & Concrete. No.48. 636-641 (1994)

K.Murakami、Y.Mitsui 和 T.Urano：“配合比因子对钢纤维混凝土力学特性的相互作用”JCA Proc.Cement

A.H.Chahrour and M.Ohtsu: "Crack Growth Prediction in Scaled-Down Model of Concrete Gravitv Dam" Theoretical and Applied Fracture Mechanics. 21. 29-40 (1994)

A.H.Chahrour 和 M.Ohtsu：“混凝土重力坝缩小模型中的裂纹扩展预测”理论与应用断裂力学。

大津政康,A.H.CRaRrour: "破壊力学に基づいたコンクリートのひびわれ進展予測のBEM解析" 第20回セメント・コンクリート研究討論会論文報告集. 63-68 (1993)

Masayasu Otsu，A.H.CRaRrour：“基于断裂力学预测混凝土裂纹扩展的 BEM 分析”第 20 届水泥和混凝土研究会议记录 63-68 (1993)。

M.Ohtsu and M.Shigeishi: "Quantitative Non-destructive Evaluation of Cracks in Concrete by Acoustic Emission SiGMA Analysis" Proc.3rd SAMPE Sym.2324-2329 (1993)

M.Ohtsu 和 M.Shigeishi：“通过声发射 SiGMA 分析对混凝土裂缝进行定量无损评估”Proc.3rd SAMPE Sym.2324-2329 (1993)

M.Shigeishi and M.Ohtsu: "Observation of Mixed-mode Fracture Mechanics by SiGMA-2D" Journal of Acoustic Emission. Vl.11, No.4. 57-63 (1994)

M.Shigeishi 和 M.Ohtsu：“通过 SiGMA-2D 观察混合模式断裂力学”声发射杂志。