Nondestructive Evaluation of FRP-Confined Concrete Using Microwave

玻璃钢约束混凝土的微波无损评价

• 批准号: 0324607
• 负责人: Oral Buyukozturk
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-11-15 至 2008-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0324607&HistoricalAwards=false
• 关键词: Nondestructive; Evaluation; FRP; Confined; Concrete

Nondestructive Evaluation of FRP-Confined Concrete Using Microwave, CMS project 0324607PI: Oral Buyukozturk, MITFiber-reinforced plastic (FRP) composite jacketing systems have emerged as an alternative to traditionalconstruction, strengthening, and repair of reinforced concrete columns and bridge piers. A large numberof projects, both public and private, have gone after such technology and escalating deployment has beenexpected, especially in seismically active regions. Yet, an efficient and effective structural evaluationtechnology that is capable of assessing the concrete conditions inside the FRP jacketing systems islacking. It is clear that a reliable concrete imaging technology needs to be soon developed to catch upwith the surging industrial applications.The objective of this research is to develop and apply effective nondestructive evaluation (NDE) imagingtechniques to visualize and quantify damages such as FRP delaminations and concrete cracking andcrumbling in FRP-confined reinforced concrete members using wideband radar. To achieve the objective,theoretical models and design of image reconstruction algorithms will be developed for automaticprocessing of measured data in parallel with experimental studies of physical models both in laboratoryand field settings. A database of electromagnetic (EM) properties of various FRP, concrete, and FRP-concrete hybrid media will also be established to facilitate these developments. The research plan consistsof four major tasks: (a) Numerical modeling of wave propagation and scattering, (b) Determination ofdielectric properties of FRP, concrete, and FRP-concrete hybrid media, (c) Physical radar measurement,and (d) Signal processing and image reconstruction. The four tasks are closely knitted in nature and willbe conducted in an iterative and evolutionary fashion.For this proposed work, a novel data focusing methodology using wideband radar is proposed for aneffective detection of various damage mechanisms associated with the FRP bonded and confinedreinforced concrete systems. Owing to the novelty of using wideband radar to detect damages of FRPconfined concrete, a one-year exploratory study has been underway since September 2002 under the NSF Small Grant Exploratory Research (SGER) program to initially demonstrate the potential capability of the herein proposed methodology. From this exploratory work thus far, promising results have been obtained. With this present proposal, funding is sought to fully develop the methodology and perform acomprehensive theoretical/experimental research toward achieving the objectives as stated above.Considering its non-traditional civil engineering nature, this project will synthesize the knowledge andunderstanding that has been developed in the areas of structural engineering, material science, electricalengineering and computer science. This multidisciplinary research project will be performed withcollaboration of Department of Civil and Environmental Engineering, Department of ElectricalEngineering and Computer Science, Research Laboratory of Electronics, and Lincoln Laboratory of theMassachusetts Institute of Technology.It is envisioned that the proposed work will significantly advance scientific knowledge in the areas of computer simulation, innovative imaging concepts, signal processing and image reconstruction, and laboratory methodologies dealing with radar measurements. Development of knowledge as a basis for manufacturing an effective equipment in this field will directly impact the profession, and benefit engineers, transportation infrastructure communities, and decision-making authorities worldwide. Application of the knowledge and technology developed will help ensure public safety against unanticipated failures of structural systems repaired or renewed using FRP composites. Developed knowledge and methodologies will be integrated into education via course curriculums and professional workshops. Every effort will be made to encourage female and minority student participation in the conduct of the proposed research.

使用Microwave，CMS项目0324607PI对FRP限制混凝土的无损评估：口服Buyukozturk，Mitfiber-Reinforced塑料（FRP）复合夹克系统已成为传统结构，增强和修复的替代品，替代了替代传统的结构，并修复了增强的混凝土柱和桥梁的修复。尤其是在地震活跃的地区，尤其是公共和私人的大量项目，无论是公共还是私人的项目，都已经预期了。然而，一种能够评估FRP夹克系统内部的具体条件的有效和有效的结构评估技术。显然，很快就需要开发出可靠的混凝土成像技术，以与工业应用的激增。该研究的目的是开发和应用有效的无损坏评估（NDE）成像技术，以可视化和量化损坏和量化损坏，并使用FRP分配和诸如FRP的裂纹和混凝土构成的成员使用限制性的成员。为了实现目标，将开发理论模型和图像重建算法的设计，以与实验室和现场设置中的物理模型的实验研究并行地自动处理测量数据。还将建立各种FRP，混凝土和FRP混合介质的电磁（EM）性质数据库，以促进这些发展。研究计划包括四个主要任务：（a）波传播和散射的数值建模，（b）确定FRP，混凝土和FRP - 凝结混合培养基的dielectric特性，（c）物理雷达测量值，以及（d）信号处理和图像重建。这四个任务在自然界中紧密编织，并以迭代和进化的方式进行。对于拟议的工作，提出了一种新型的数据聚焦方法，使用宽带雷达进行了一种新的数据，以对与FRP键合的各种损伤机制进行有效检测。由于使用宽带雷达检测FRPCONCHINE CONCRETE的损害的新颖性，自2002年9月以来，根据NSF小型赠款探索性研究（SGER）计划，已经进行了为期一年的探索性研究，以最初证明此处建议的方法论的潜在能力。从到目前为止的这项探索性工作中，已经获得了有希望的结果。通过本建议，寻求资金充分开发方法，并执行可吸引人的理论/实验研究，以实现上述目标。考虑其非传统的土木工程性质，该项目将综合知识和无意义的知识，这些知识是在结构工程，材料工程学，电力科学，电力，电力，电力技术和计算机科学和计算机上。该多学科研究项目将通过民用和环境工程系，电工和计算机科学系，电子产品研究实验室以及Themassachusetts Technology Institute的林肯实验室进行策略进行。雷达测量。发展知识作为在该领域制造有效设备的基础的发展将直接影响该行业，并使工程师，运输基础设施社区和全球决策机构受益。开发的知识和技术的应用将有助于确保公共安全，以防止使用FRP复合材料修复或更新的结构系统的意外故障。开发的知识和方法将通过课程课程和专业研讨会纳入教育。将尽一切努力鼓励女性和少数族裔学生参与拟议研究的行为。