CAREER: Rapid non-destructive assessment of concrete structures using elastic waves

该方案为快速准确地评估混凝土结构的原位状态提供了一种方法。敏感而实用的濒死体验技术对管理基础设施的机构具有重要价值。然而，执行当前的NDE测试和分析结果所需的时间和精力限制了其广泛应用。本提案旨在开发一种快速而稳健的方法来收集混凝土结构的弹性波数据，以及一种表征受损区域位置、类型和大小的结构成像方法。提出的方法利用了几个创新，包括(a)使用表面导波，(b)敏感的非接触式波接收技术，如空气耦合换能器和激光干涉测量，(c)单侧，点源，点接收器NDE测量，如表面波传输和速度扫描，以及(d)利用已开发的测量数据的成像方法。教育计划与拟议的研究紧密结合在一起。教育计划的目的是在德雷塞尔大学设计本科和研究生工程课程，以满足当前基础设施行业的需求。该计划还包括额外的教育推广，以鼓励市中心的学生从事工程方面的职业。

This proposal offers an approach for rapid and accurate non-destructive evaluation (NDE) to assess the in-place condition of concrete structures. Sensitive and practical NDE techniques are of great value to agencies that govern the infrastructure. However, the time and effort required to perform current NDE tests and to analyze the results limit widespread application. This proposal aims to develop a rapid and robust method to collect elastic wave data from a concrete structure and an approach for imaging structures that characterizes the location, type and magnitude of damaged areas. The proposed approach makes use of several innovations including (a) use of surface-guided waves, (b) sensitive, non-contact wave reception techniques such as air-coupled transducers and laser interferometry, (c) one-sided, point source, point receiver NDE measurements such as surface wave transmission and velocity scans, and (d) an imaging approach that makes use of the developed measurement data. An educational plan is closely integrated with the proposed research. The intent of the educational plan is to design an undergraduate and graduate engineering curriculum at Drexel University that responds to current needs of the infrastructure industry. The plan also includes additional educational outreach to encourage inner-city students to pursue a career in engineering.