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

高温和持续荷载对民用基础设施结构粘合修复的影响

• 批准号: 0826461
• 负责人: Maria del Mar Lopez de Murphy
• 金额: $ 15万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0826461&HistoricalAwards=false
• 关键词: Temperature; Sustained; Load; Effects; Structural

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.

建议的调查使用实验和分析方法来评估温度和持续荷载对外部粘结纤维增强聚合物加固的钢筋混凝土结构的影响。它包括加固系统的各个组成部分和混凝土/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。所提出的数值分析程序的鲁棒性源于断裂和损伤力学方法的创新使用，以表征强化系统的个别材料和界面特性。因此，该分析将能够预测任何规模的加固结构的行为。项目成功完成后，研究和工程界将更好地了解加固系统中随时间变化的变形和附着力退化的双重机制，以及这些机制如何影响剩余结构强度和安全性。 调查人员有详细的计划，将他们的活动和发现融入专业，大学教学和针对代表性不足群体的推广计划。因此，该研究将有助于：（i）时间和温度对强化系统性能影响的新实验数据;（ii）基于材料和界面特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，以造福研究界，实践工程师和学生。