GPR signal analysis of post-tensioned prestressed concrete girder defects
GPR signal analysis of post-tensioned prestressed concrete girder defects
复制标题
后张预应力混凝土梁缺陷探地雷达信号分析
DOI：
10.1088/1742-2132/10/3/034005
复制
发表时间：
2013-06
影响因子：
1.4
通讯作者：
Lei, Linlin
中科院分区：
文献类型：
--
作者：
Liu, Sixin;Weng, Changnian;Jiao, Pengfei;Wang, Fei;Fu, Lei;Meng, Xu;Lei, Linlin
后张预应力混凝土孔道状况的准确检测是探地雷达混凝土检测的重要组成部分。目的是检查绞线所在管道的灌浆情况，以确定管道中是否有空隙，以及是否存在水。为了研究不同PPC管道缺陷的雷达图像特征，制作了一些模型梁。我们的研究包括三个主要管道：（1）灌浆良好且无空隙（正常条件）;（2）管道半填充，空隙由水或空气填充;以及（3）管道根本未填充，管道填充水或空气。采集并处理与七种不同情况相对应的数据。发现雷达可以探测到管道内的第一个界面，而管道内的详细结构却无法探测到。看见了吗？直接从图像中。特征曲线对解释有很大帮助。完全空的管道最容易与其他管道区分开来。这种情况下的信号特征在于强而清晰的反射界面，当空隙充满水时，反射界面变得较弱。正常情况下，显示最弱的反射界面。对于半空的情况，前扫描示出了与正常条件相似的结果，无论是充水还是充空气，后扫描示出了与完全空的情况相似的特征。试验和分析对实际工程检测具有一定的指导意义。
The accurate inspection of the duct condition in post-tensioned prestressed concrete (PPC) is an essential part of GPR concrete inspection. The purpose is to inspect the grouting condition of the ducts where the strands are located, to find out if there is a void in the ducts, and if any water exists. In order to investigate the radar image characteristics of different PPC duct defects, a number of model girders were manufactured. Three major ducts are included in our study: (1) well grouted and no void (normal condition); (2) the duct is half filled, and the void is filled by water or air; and (3) the duct is not filled at all, and the duct is water or air filled. The data corresponding to seven different situations are acquired and processed. It is found that the radar can detect the first interface in the duct, and the detailed structure inside the duct cannot be ?seen? from the images directly. Characteristic curves greatly help the interpretation. A completely void duct is the easiest to differentiate from the others. The signature for this situation is characterized by a strong and clear reflection interface which becomes weaker as the void is water filled. The normal condition shows the weakest reflection interface. As for the half void situation, the front scan shows a similar result to the normal condition whether it is water or air filled, and the back scan shows similar features to the completely void situation. The experiment and analysis is helpful and instructive for practical engineering inspection.
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DOI：
--
发表时间：
2008-12
期刊：
2022 China Automation Congress (CAC)
影响因子：
--
作者：
David G. Pollock;K. Dupuis;B. Lacour;K. Olsen
通讯作者：
David G. Pollock;K. Dupuis;B. Lacour;K. Olsen
影响因子：
4.2
作者：
C. Maierhofer;A. Brink;M. Röllig;H. Wiggenhauser
通讯作者：
C. Maierhofer;A. Brink;M. Röllig;H. Wiggenhauser
影响因子：
1.4
作者：
Liu, LB;Guo, TS
通讯作者：
Guo, TS
影响因子：
4.2
作者：
Xavier Dérobert;C. Aubagnac;O. Abraham
通讯作者：
Xavier Dérobert;C. Aubagnac;O. Abraham
影响因子：
1.9
作者：
Lai, W. L.;Kind, T.;Wiggenhauser, H.
通讯作者：
Wiggenhauser, H.