...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Geophysics >A three dimensional approach for tracking cracks in bridges using GPR
【24h】

A three dimensional approach for tracking cracks in bridges using GPR

机译：使用GPR的桥梁裂缝追踪的三维方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Corrosion associated with reinforcing bars is the most significant contributor to bridge deficiencies. The corrosion is usually caused by moisture and chloride ion exposure. The reinforcing bars are attacked by corrosion and yield expansive corrosion products. These oxidation products occupy a larger volume than the original intact steel and internal expansive stresses lead to cracking and debonding. There are some conventional inspection methods for the detection of the reinforcing bar's corrosion but they can be invasive and destructive, often laborious, and lane closure is required and it is difficult or unreliable for any quantification of corrosion. For these reasons, bridge engineers always prefer more to use the ground penetrating radar (GPR) technique. In this work a novel numerical approach for three dimensional tracking and mapping of cracks in the bridge is proposed. The work starts from some interesting results based on the use of the 3D imaging technique in order to improve the potentiality of the GPR to detect voids, cracks or buried objects. The numerical approach has been tested on data acquired on a bridge by using a pulse GPR system specifically designed for bridge deck and pavement inspection. The equipment integrates two arrays of Ultra Wide Band ground coupled antennas, having a main working frequency of 2. GHz. The two arrays are using antennas arranged with a different polarization. The cracks, associated often to moisture increase and higher values of the dielectric constant, produce a not negligible increase of the signal amplitude. Following this, the algorithm, organized in preprocessing, processing and postprocessing stages, analyzes the signal by comparing the value of the amplitude all over the domain of the radar scan.
机译：与钢筋相关的腐蚀是造成桥梁缺陷的最主要因素。腐蚀通常是由湿气和氯离子暴露引起的。钢筋受到腐蚀并产生膨胀的腐蚀产物。这些氧化产物比原始完整的钢占据更大的体积，内部膨胀应力导致开裂和剥离。存在一些用于检测钢筋腐蚀的常规检查方法，但是它们可能是侵入性的和破坏性的，通常很费力，并且需要封闭车道，并且很难或不可靠地对腐蚀进行定量。由于这些原因，桥梁工程师总是更喜欢使用探地雷达（GPR）技术。在这项工作中，提出了一种新颖的数值方法，用于桥梁中裂缝的三维跟踪和映射。该工作从基于3D成像技术的使用中获得的一些有趣结果开始，以提高GPR检测空隙，裂缝或掩埋物体的潜力。通过使用专门设计用于桥面和路面检查的脉冲GPR系统，对数值方法进行了测试，以对桥梁上采集的数据进行测试。该设备集成了两个超宽带地面耦合天线阵列，其主要工作频率为2 GHz。这两个阵列使用的极化天线不同。经常与湿度增加和较高的介电常数有关的裂纹会导致信号幅度的增加不可忽略。此后，在预处理，处理和后处理阶段组织的算法通过比较整个雷达扫描范围内的振幅值来分析信号。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号