Innovative CFRP Prestressed Concrete Box-Beam Bridge System

创新的CFRP预应力混凝土箱梁桥系统

• 批准号: 0408593
• 负责人: Nabil Grace
• 金额: --
• 依托单位: Lawrence Technological University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0408593&HistoricalAwards=false
• 关键词: Innovative; CFRP; Prestressed; Concrete; Box

Prestressed concrete box-beams are one of the most commonly used structural components for the construction of small and medium span highway bridges in the United States. However, the problems experienced by this type of bridge in various states are serious. These problems include: (1) deterioration of concrete resulting from corrosion of steel reinforcements, (2) longitudinal cracks in the deck slabs between the box beams, and (3) leakage problems due to the deck slab longitudinal cracks. These combined problems mandate significant and continuously increasing maintenance costs to repair and restore the load carrying capacity of this type of bridge.To solve the above-listed problems, an innovative design and construction approach of a new and long lasting box-beam bridge system using carbon fiber reinforced polymer (CFRP) needs to be developed, evaluated, and implemented. In addition, the developed approach must allow for the timely reconstruction of box-beam bridges to alleviate the disruption to traffic. This development and evaluation will require extensive collaboration among: CFRP tendon/stirrup fabricators, precaster/contractors, academia, and end users. This study will be conducted at Lawrence Technological University with collaboration from Diversified Composites, Inc, Prestressed System, Inc. (PSI), and Michigan DOT.In the first phase, four full-scale box-beams, two beams with and two beams without PT tendons will be tested under service, fatigue, and ultimate loading. The second phase will address the behavior of two bridge models during various stages of construction and in service.The proposed RUI collaboration will be extended to teaching and seminar activities for our undergraduate students. The FRP producer, precaster, and MDOT engineers will be guest lecturers at LTU. The university undergraduate research team and the industrial partners will provide seminars at the annual meetings of the Associated General Contractors of America (AGC) and at meetings of the Great Lakes DOTs Consortium.Collaboration between university and CFRP-manufacturer/MDOT/CFRP-precaster will result in the development of an innovative corrosion/maintenance-free CFRP prestressed concrete box-beam bridge system.

预应力混凝土箱形梁是美国中小跨径公路桥梁最常用的结构构件之一。然而，这种类型的桥梁在各州遇到的问题是严重的。这些问题包括：（1）钢筋锈蚀导致混凝土劣化，（2）箱形梁之间的桥面板出现纵向裂缝，以及（3）桥面板纵向裂缝导致的渗漏问题。这些综合问题的任务显着和不断增加的维护成本，以修复和恢复这种类型的桥梁的承载能力。为了解决上述问题，一个创新的设计和施工方法，一个新的和持久的箱梁桥系统，使用碳纤维增强聚合物（CFRP）需要开发，评估和实施。此外，制定的方法必须考虑到及时重建箱形梁桥，以减轻交通中断。这种开发和评估将需要以下各方的广泛合作：CFRP筋/钢筋混凝土制造商、预制件/承包商、学术界和最终用户。本研究将在劳伦斯理工大学与多元化复合材料公司、预应力系统公司合作进行。(PSI)在第一阶段，四个全尺寸箱梁，两个梁与PT筋和两个梁没有将在服务，疲劳和极限载荷下进行测试。第二阶段将解决两个桥梁模型在施工和使用的各个阶段的行为。拟议的RUI合作将扩展到我们的本科生的教学和研讨会活动。玻璃钢生产商，预制，和MDOT工程师将在LTU客座讲师。大学本科生研究团队和工业合作伙伴将在美国总承包商协会（AGC）年会和五大湖DOT联盟会议上提供研讨会。大学与CFRP制造商/MDOT/CFRP预制件之间的合作将导致创新的耐腐蚀/免维护CFRP预应力混凝土箱梁桥系统的开发。