SST: Polymer Fiber and Waveguide Sensors for Perofmance-Based Assesment and Health Monitoring of Civil Infrastructure Systems

Abstract0428301T。本提案中描述的研究旨在开发用于民用基础设施系统性能评估和健康监测的聚合物波导传感器。虽然待开发的传感器可用于测量各种荷载条件和结构材料下的应变，但本研究项目将重点研究传感器在动态荷载条件下混凝土和钢结构的应用。为了真正理解结构的破坏机制，有必要有可靠的传感器，可以测量大应变，至少高达10%，在高应变率下，高达每秒3%。提出的研究的具体目标是开发(1)用于测量分布应变和/或局部应变的干涉式聚合物光纤传感器和(2)用于嵌入特定结构系统的微创、高灵敏度聚合物平面波导传感器。研究目标将通过传感器设计来实现，其中包括传感器的有限元建模和通过遗传算法优化其响应。传感器的发展将通过结合非线性响应历史分析的实验室和实地研究来评估。即将开发的聚合物传感器将对结构测试产生重大的直接影响，因为研究人员将获得以前无法获得的非弹性变形和损伤积累机制的见解。此外，由于聚合物波导传感器可以嵌入到结构中，因此在复合结构和沥青混凝土路面的健康监测领域具有很大的潜力。通过提出的教育计划，一名研究生将与国际合作者Calvi教授一起研究位于意大利的历史建筑。此外，大学预科学生将通过北卡罗莱纳州立大学现有项目的扩展参与该项目。

Abstract0428301T. HassanNC State UnivThe research described in this proposal aims to develop polymer waveguide sensors for the performance-based assessment and health monitoring of civil infrastructure systems. Although the sensors to be developed can be utilized to measure strains under a variety of load conditions and structural materials, this research program will focus on application of the sensors to concrete and steel structures subjected to dynamic load conditions. In order to truly understand the failure mechanisms of structures, it will be essential to have reliable sensors that can measure large strains, at least up to 10%, at high strain rates, up to 3% per second. The specific objectives of the proposed research are to develop (1) an interferometric polymer optical fiber sensor for the measurement of distributed strains and/or localized strains and (2) a minimally invasive, high sensitivity polymer planar waveguide sensor for embedment into particular structural systems. The objectives of the research will be achieved by sensor design, which includes finite element modeling of the sensors and optimization of their response through a genetic algorithm. Sensor development will be evaluated by a combination of lab and field studies in conjunction with non-linear response history analyses. The polymer sensors to be developed will have significant immediate implications for structural testing as researchers would gain previously unavailable insight into the mechanisms of inelastic deformation and damage accumulation. Furthermore, since polymer waveguide sensors can be embedded within structures, they have great potential in the field of health monitoring of composite structures and asphalt concrete pavements. Through the educational plan proposed, one graduate student will work with the international collaborator, Professor Calvi, on the historic structures located in Italy. In addition, pre-college students will participate in the project through the expansion of an existing program at North Carolina State University.