High Temperature and Sustained Load Effects on Structural Bonded Repairs in Civil Infrastructure

该研究采用试验和分析的方法来评估温度和持续荷载对外贴纤维加固钢筋混凝土结构的影响。它包括加固系统的各个组件和混凝土/环氧树脂界面，并使用这些信息来模拟加固系统的长期结构性能。所提出的数值分析方法的稳健性来自于创新地使用断裂和损伤力学方法来表征强化系统的个别材料和界面属性。项目成功完成后，研究和工程界将更好地了解加固体系中随时间变化的变形和粘结退化的双重机制，以及这些机制如何影响结构的剩余强度和安全性。调查人员有详细的计划，将他们的活动和发现融入到专业、大学教学和针对代表性不足群体的外联计划中。因此，这项研究将有助于：(I)关于时间和温度对强化系统性能的影响的新的实验数据；(Ii)基于材料和界面属性的整体结构性能的新建模方法；以及(Iii)知识传播和人力资源开发，以造福于研究界、执业工程师和学生。

The proposed investigation uses experimental and analytical methods to evaluate the effects of temperature and sustained loading on reinforced concrete structures strengthened with externally bonded fiber reinforced polymers. It includes the individual components of the strengthening system and the concrete/epoxy interface, and uses this information to model the long-term structural performance of strengthened systems. The robustness of the proposed numerical analysis procedures stems from the innovative use of fracture and damage mechanics approaches to characterize the individual materials and interfacial properties of strengthened systems. Therefore, the analysis will be capable of predicting the behavior of strengthened structures of any scale.Upon successful completion of the project, the research and engineering communities will have a better understanding of the dual mechanisms of time dependent deformation and degradation of adhesion in the strengthened system and how these mechanisms affect the remaining structural strength and safety. The investigators have detailed plans for integrating their activities and findings into the profession, in their university teaching, and in outreach programs targeting underrepresented groups. Thus, the research will contribute: (i) new experimental data on the effects of time and temperature on strengthened system performance; (ii) a new modeling approach for overall structural performance based on material and interfacial properties; and (iii) knowledge dissemination and human resource development for the benefit of the research community, practicing engineers, and students.