Evaluation and Damage Repair of 23-Year Old Prestressed Bridge Box Girders

23年预应力桥箱梁的评估与损伤修复

• 批准号: 9201908
• 负责人: Mehdi Saiidi
• 金额: $ 24.38万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9201908&HistoricalAwards=false
• 关键词: Evaluation; Damage; Repair; 23; Year

During the demolition of a 23-year old concrete bridge in Reno, a large number of plant-cast prestressed concrete box girders with a length of 69' were recovered in good condition. Six of the girders have been donated to the University of Nevada, Reno (UNR), for research purpose. These girders provide an excellent opportunity to study different aspects of the behavior, design, repair, and fatigue life of existing structures. Research funds have been received from the Department of Energy to test two girders to determine their actual stiffness and strength and to conduct limited studies on the repair of the girders. The primary objective of this proposal is to study four additional girders to determine (1) the actual prestress forces, (2) the extent of chloride contamination after 23 years of exposure to deicing salt, (3) the effect of low-level damage on the remaining life, and (4) appropriate repair techniques for girders damaged by collision, and to investigate the fatigue performance of the repaired girders.

在拆除里诺一座有23年历史的混凝土桥时， 大量的预应力混凝土箱梁， 69'的长度恢复良好。 六 梁已捐赠给内华达州大学，里诺（UNR）， 用于研究目的。 这些大梁提供了一个很好的 有机会研究不同方面的行为，设计， 维修和现有结构的疲劳寿命。 科研经费 从能源部收到了两份测试报告 确定其实际刚度和强度， 对大梁的修复进行有限的研究。 本提案的主要目的是研究四个新的 梁确定（1）实际预应力，（2） 暴露23年后氯化物污染的程度 除冰盐;（3）低水平的破坏对剩余的 寿命，以及（4）适当的修复技术， 碰撞，并调查疲劳性能的 修复梁。