Non-Destructive Evaluation of Structures Retrofitted with Fiber Composites

*** 9622403纤维增强复合材料（FRP）正迅速成为一种可行的新型建筑材料。也许这些材料最适合的应用领域是加强、修理和修复现有的土木结构。然而，一个主要的问题是施工时的质量控制和这些材料的长期性能。本研究的主要重点是开发一种无损评价系统，以确定建筑行业中使用的复合材料的特性。该设备可在施工完成后用于监测由于紫外线、湿气渗透等环境影响而导致的玻璃钢变质或分层。通过对内部缺陷、空隙和分层的超声检查，对修复质量进行无损监测。在这项研究中，“亲吻”和“滑动”结合界面，往往是危险的材料系统的完整性，将通过激发强界面波来研究。利用超声扫描仪在不完美的键合界面处产生界面波，有望成功地检测出这些缺陷。＊＊＊

*** 9622403 Ehsani Fiber Reinforced Composites, FRP, are fast becoming a viable new construction material. Perhaps the most suitable area of application for these materials is in the field of strengthening, repair and rehabilitation of existing civil structures. A major concern, however, is the quality control at the time of construction and the long-term behavior of these materials. The primary focus of this study is to develop a Non- Destructive Evaluation system for determining the characteristics of composites used in the construction industry. The equipment can be utilized after the completion of the construction to monitor any deterioration or delamination of the FRP which could result from environmental effects such as ultraviolet rays, moisture penetration, etc. The quality of rehabilitation will be monitored nondestructively by ultrasonic inspection of internal defects, voids and delaminations. In this research "kissing" and "slip" bonded interfaces, often dangerous for the integrity of material systems, will be investigated by exciting strong interface waves. It is expected that one will be able to successfully detect these defects by generating interface waves at the imperfect bond interfaces using an ultrasonic scanner. ***