Strengthening of Steel Girder Bridges with Carbon Composite Laminates

碳复合材料层压板加固钢梁桥

• 批准号: 9413857
• 负责人: Hamid Saadatmanesh
• 金额: $ 24.04万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9413857&HistoricalAwards=false
• 关键词: Strengthening; Steel; Girder; Bridges; Carbon

9413857 Saadatmanesh This project will demonstrate experimentally and analytically the feasibility of strengthening and retrofitting steel girders in composite steel concrete bridges with epoxy bonded carbon fiber laminates. For upgrading the flexural capacity, carbon fiber plates or tapes are epoxy bonded to the girder tension flange. For retrofitting, this material is epoxy bonded to the girder tension flange which contains pre-existing fatigue cracks. Three beams will be tested under static loading to determine the flexural strength of a composite section of concrete deck, steel girder, carbon fiber tape, and epoxy. This includes strengthening in the positive and negative moment regions. Five sets of beam fatigue tests will be investigated for a section of steel girder, carbon fiber tape, and epoxy. This includes investigation of: Fatigue strength in the positive moment region with pre-existing fatigue cracks; fatigue strength as a function of applied stress range; classification of fatigue strength according to the AASHTO's Standard Categories; and the ability of retrofit to arrest fatigue crack growth. This project is a joint effort between the University of Arizona and the Worcester Polytechnic Institute. All full-scale tests will be conducted at the University of Arizona. The coupon tests will be performed at the Worcester Polytechnic Institute. The analysis of results and development of guidelines and methodology for application of this technique will be performed by the investigators at both institutions. ***

9413857 Saadatmanesh该项目将通过实验和分析证明用环氧树脂粘结碳纤维层压板加固和改造复合钢混凝土桥梁中钢梁的可行性。 为了提高抗弯承载力，碳纤维板或带是环氧树脂粘结到梁张力翼缘。 对于改造，这种材料是环氧树脂粘合到梁张力法兰，其中包含预先存在的疲劳裂纹。 三根梁将在静态荷载下进行测试，以确定混凝土桥面、钢梁、碳纤维带和环氧树脂的复合截面的弯曲强度。 这包括在正弯矩区和负弯矩区的加强。 将对一段钢梁、碳纤维胶带和环氧树脂进行五组梁疲劳试验。 这包括调查：疲劳强度在正力矩区域与预先存在的疲劳裂纹;疲劳强度作为施加应力范围的函数;根据AASHTO的标准类别的疲劳强度的分类;和能力的改造，以阻止疲劳裂纹的增长。 这个项目是亚利桑那大学和伍斯特理工学院的共同努力。 所有的全面测试将在亚利桑那大学进行。 试样测试将在伍斯特理工学院进行。 两个机构的研究者将对结果进行分析，并制定应用该技术的指南和方法。 ***