Damage monitoring of CFRP retrofit using optical fiber sensors
Damage monitoring of CFRP retrofit using optical fiber sensors
复制标题
使用光纤传感器对 CFRP 改造进行损伤监测
DOI：
10.1117/12.2086984
复制
发表时间：
2015
影响因子：
2.9
通讯作者：
Tarik J. Dickens
中科院分区：
文献类型：
--
作者：
Kunal Joshi;Jolie Breaux Frketic;D. Olawale;Tarik J. Dickens
由于近25%的桥梁基础设施被认为存在缺陷，混凝土结构的维修是一个关键的需求。FRP材料作为薄层压板或织物似乎是传统修复技术的理想替代品，因为它们具有高的强度重量比和刚度重量比。此外，FRP材料在轻质、高强度、经济高效和耐用的改造方面具有巨大的潜力。使用CFRP加固的一个缺点是它的脆性破坏，这是由其应力-应变行为的近似线性弹性性质引起的。这会导致改造构件的强度降低，因此，对结构进行改造的健康状况对于维持结构的可用性变得同样重要。本文提供了一个系统，通过光纤传感器编织到结构中提供损伤传感来监测CFRP加固件的损伤。预制裂纹钢筋混凝土梁采用CFRP层压板与最常用的FRP应用技术进行加固。梁在恒定应力下进行测试，以允许改装失败，同时评估传感系统的性能。剥离失效模式，在9 MPa的应力成功地检测TL光纤传感器除了在弯曲故障检测。FRP加固梁的实时故障检测已成功实现，改造损伤监测计划旨在提供一种工具，以减少响应时间和决策，参与维修有缺陷的结构。
With nearly 25% of bridge infrastructure deemed deficient, repair of concrete structures is a critical need. FRP materials as thin laminates or fabrics are appearing to be an ideal alternative to traditional repair technology, because of their high strength to weight ratios and stiffness to weight ratios. In addition, FRP materials offer significant potential for lightweight, high strength, cost-effective and durable retrofit. One drawback of using CFRP retrofitting is its brittle-type failure; caused by its nearly linear elastic nature of the stress-strain behavior. This causes a strength reduction of the retrofitted member, thus the health of the retrofit applied on the structure becomes equally important to sustain the serviceability of the structure. This paper provides a system to monitor damage on the CFRP retrofits through optical fiber sensors which are woven into the structure to provide damage sensing. Precracked reinforced concrete beams were retrofitted using CFRP laminates with the most commonly used FRP application technique. The beams were tested under constant stress to allow the retrofitting to fail while evaluating the performance of the sensing system. Debonding failure modes at a stress of 9 MPa were successfully detected by TL optical fiber sensors in addition to detection during flexural failure. Real-time failure detection of FRP strengthened beams was successfully achieved and the retrofit damage-monitoring scheme aims at providing a tool to reduce the response time and decision making involved in maintenance of deficient structures.