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Development of Non-Destructive Inspection Technology for Preservation and Repair of Modern Structures Especially for Masonry

现代结构尤其是砖石结构的保存与修复无损检测技术的发展

基本信息

批准号：
11555148
负责人：
TANIGAWA Yasuo
金额：
$ 8.77万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555148/
关键词：
) Non-Destructive Testing Methods Rebound Number Method Small Size Core Color Radar Finite Difference Time Domain Method Ultrasonic Tomography Magnetostriction Method 内部探査力学特性超音波斜角法トモグラフィーリンギング中性化深さシュミットハンマー反発硬度磁

项目摘要

The results obtained in this research for non-destructive testing methods are summarized as follows :1. Rebound Number Method : The experiment applying for brick specimens was carried out. As the result, the estimation of strength of brick by reboulnd number on long side surface is more accurate than the estimation of concrete specimen. Moreover, the accuracy is improved with the consideration of moisture content of specimen.2. Small Size Core : The fundamental experiment for the evaluation of strength of concrete in structure was carried out. As the result, it is clarified that the accuracy of estimation by small size core is enough because of the improvement of number of specimen, solving the problems of ordinary cores.3. Color : The experimental discussion of influencing factors on color of mortar bars was carried out. As the result, the possibility of estimation of elastic modulus is shown by measurement of color.4. Radar : The possibility of detection of reinforcement or cavity was shown by the numerical analysis with finite difference time domain method. Moreover, using the improved radar, the validation test and detection of reinforcement and cavity at Vico Forte Church, Italy, were carried out.5. Ultrasonic Tomography : The experimental and analytical discussion was carried out. As the result, it is clarified that the correction with the angle of sonsors and the separation analysis of scanning lines into two directions are effective.6. Magnetostriction Method : The fundamental experiments were carried out. As the results, it is clarified that the influence of mortar is small, and the possibility of estimation of stress is shown by the calibration curves considering yield stress, diameter and depth of the reinforcing steel bar.

本研究对无损检测方法的研究取得了如下成果：1。回弹数法：采用砖试件进行试验.结果表明，用砖长侧面上的石砾数估算砖的强度比用混凝土试件估算的强度更准确。同时，考虑了物料含水率的影响，提高了测量精度.小型芯块：进行了结构混凝土强度评定的基础性试验。结果表明，由于试件数量的增加，小尺寸岩心的估算精度已经足够，解决了普通岩心的问题.颜色：对影响砂浆棒颜色的因素进行了试验探讨。结果表明，通过颜色的测量可以估算弹性模量.雷达：通过时域有限差分法的数值分析，证明了检测钢筋或空洞的可能性。并利用改进后的雷达对意大利维科福特教堂的钢筋和空洞进行了验证试验和检测.超声层析成像：进行了实验和分析讨论。结果表明，用探头角度进行校正和两个方向的扫描线分离分析是有效的.磁致伸缩法：进行了基础实验。结果表明，砂浆的影响很小，考虑屈服应力、钢筋直径和钢筋深度的标定曲线表明了应力估算的可能性。