CAREER: Increasing Resiliency and Sustainability of Reinforced Concrete against Aging and Seismic Hazards through Novel Materials

职业：通过新型材料提高钢筋混凝土抗老化和地震危害的弹性和可持续性

• 批准号: 1453757
• 负责人: Bora Gencturk
• 金额: $ 50万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1453757&HistoricalAwards=false
• 关键词: CAREER; Increasing; Resiliency; Sustainability; Reinforced

This Faculty Early Career Development (CAREER) Program grant will investigate the combined effects of environmental aging and earthquakes on concrete bridges. The main cause of aging-induced deterioration in concrete bridges is corrosion of reinforcing bars, which may result in a significant reduction in load capacity and endanger the safety of the structure. An in-depth computational-experimental research program will be conducted to understand the main corrosion-related degradation mechanisms in reinforced concrete and potential impacts of earthquakes on the deteriorated bridge structure. Novel engineering materials of high-performance fiber-reinforced concrete and superelastic steel alloys will be employed to increase resiliency of the bridge members. The outcomes of this project are expected to result in direct benefits to the society by extending the lifetimes of bridge structures and by reducing the repair and maintenance costs. It is expected that the evaluation, prediction, and design tools developed in this project will serve as a basis for future research and implementation, in not only bridges but also in other reinforced concrete structures such as ports. The research and education will be integrated by creating a community with university researchers and with high school teachers and their students. The Investigator plans to engage college students from underrepresented groups in the project. High-performance fiber-reinforced concrete exhibits high crack tightness, increased tensile ductility, low permeability, and higher damage resistance compared with traditional concrete. Novel Cu-Al-Mn superelastic alloy reinforcing bars can recover large strains upon unloading. In addition, they are easily machinable and have a cost advantage over conventional superelastic alloy bars. Through use of these new materials, the objective of this project is to improve the seismic performance and durability of bridge structural elements. New knowledge will be generated on the deterioration processes of concrete structures, the thermo-mechanical behavior of new superelastic alloys, and the seismic response of deteriorated bridges.

这项教师早期职业发展（Career）计划将研究环境老化和地震对混凝土桥梁的综合影响。混凝土桥梁老化劣化的主要原因是钢筋的腐蚀，这可能导致承载能力的显著降低，危及结构的安全。一项深入的计算实验研究计划将进行，以了解钢筋混凝土腐蚀相关的主要退化机制和地震对退化桥梁结构的潜在影响。将采用高性能纤维增强混凝土和超弹性钢合金等新型工程材料来提高桥梁构件的回弹能力。该项目的成果预计将通过延长桥梁结构的使用寿命和降低维修和维护成本，为社会带来直接利益。预计本项目开发的评估、预测和设计工具将成为未来研究和实施的基础，不仅适用于桥梁，也适用于其他钢筋混凝土结构，如港口。研究和教育将通过与大学研究人员和高中教师及其学生建立一个社区来整合。研究者计划让来自代表性不足群体的大学生参与该项目。与传统混凝土相比，高性能纤维增强混凝土具有高裂缝密封性、高拉伸延性、低渗透性和更高的抗损伤性。新型Cu-Al-Mn超弹性合金钢筋卸荷后可恢复大应变。此外，它们易于加工，并且比传统的超弹性合金棒具有成本优势。通过使用这些新材料，这个项目的目标是提高桥梁结构构件的抗震性能和耐久性。在混凝土结构的劣化过程、新型超弹性合金的热力学行为以及劣化桥梁的地震反应方面将产生新的知识。