Integrity of Precracked Reinforced Concrete Retrofitted withComposite Laminates

复合层板加固预裂钢筋混凝土的完整性

• 批准号: 9634763
• 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: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634763&HistoricalAwards=false
• 关键词: Integrity; Precracked; Reinforced; Concrete; Retrofitted

9634763 Buyukozturk The objective of this research is to provide a scientific basis for the underlying mechanisms of fracture and delamination of precracked reinforced concrete retrofitted using fiber-reinforced plastic (FRP) composite laminates, and to develop design guidelines for efficient applications and safe engineering designs of these systems. Laminated beams have been observed to fail through several mechanisms, including yielding of the laminate, crushing of the concrete, and brittle fracture through delamination of the composite from the concrete. Available experience has shown that fracture through delamination can occur at stress below material limits and under loads within normal service. The emphasis of this study will be on delamination and its causes, specifically in the presence of combined flexural and shear cracks in the retrofitted concrete beam. Fracture mechanics based combined experimental and numerical studies of failure initiating from the concrete-adherent-laminate interface region will be performed on concrete beams laminated with fiber-reinforced plastics. Parametric investigations involving different materials and construction techniques will determine the optimum effectiveness of these combinations. The project will have the collaboration of Swiss Federal Laboratories for Materials Testing and Research (EMPA) in Switzerland where large scale tests will be conducted with consistent parameters as will be used in this study. This research is expected to provide a fundamental knowledge of FRP delamination, and be developing the needed design guidelines to have a direct impact on engineering application in the retrofitting field in an efficient, economical, and safe manner. ***

9634763 Buyukozturk这项研究的目的是为使用纤维增强的塑料（FRP）复合层层层材料进行骨折和分层的基础机制提供科学基础，并为这些系统的生效应用和安全的工具设计指南制定设计指南。 已经观察到层压梁通过多种机制失败，包括层压板的屈服，混凝土粉碎以及通过从混凝土中复合材料分层的分层来碎裂。 可用的经验表明，通过分层的断裂可能在低于材料限制的压力下以及正常服务中的负载下发生。 这项研究的重点将是分层及其原因，特别是在经过改装的混凝土束中弯曲和剪切裂纹的情况下。 基于断裂力学的结合实验和数值研究，将对由纤维增强的塑料层压的混凝土梁进行从混凝土粘附层压板界面区域启动。 涉及不同材料和施工技术的参数研究将决定这些组合的最佳有效性。 该项目将在瑞士瑞士联邦实验室进行材料测试和研究（EMPA）的合作，在那里将以一致的参数进行大规模测试。 预计这项研究将提供有关FRP分层的基本知识，并制定所需的设计指南，以有效，经济和安全的方式对改装领域的工程应用产生直接影响。 ***